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aslsa.rng(at)gmail.com
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 Posted: Tue Sep 15, 2009 12:13 pm Post subject: Tachometers |
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Here at the house where tachometers go to die or malfunction, I've had another casualty. I put a 270 degree sweep UMA in while upgrading the electrics / panel. It was good for the first two hours then the needle started to wobble over a 400 rpm range at full throttle and would steady when power came back below 6000 rpm. By the fifth hour that wobbling is down to 5400 rpm and readings are otherwise erratic, too. First take off with two blade prop tach read 6300 to 6500 rpm in climb at max wobble. Last of four take offs and full throttle reading was 5800 at top of wobble. Of course warranty expired last month. Tech guy at UMA said to try a 300 ohm resistor between tach signal and ground and see it that makes it steady, otherwise, send it back. Not impressed with five hour MTBF. Did a break in on customers 447 with new Westach. Had to repeat the entire break in when I discovered it was reading rpm off about 1/3 low. Really not impressed with failure out of the box.
So the question is, anyone running an AVI or MGL digital tach? If I can't have a big sweep, I'll settle for big numbers on a digital read out.
Rick Girard
do not archive
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Tue Sep 15, 2009 12:28 pm Post subject: Tachometers |
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What engine?
Only thing I could get to work correctly on my 912 engines were Rotax tachs from Lockwood.
I tried a UMA initially, but could not get it to work. After many calls to UMA techs, was sent another. It duplicated the same errors. I wanted a 3", but settled for the Rotax 2".
john h
mkIII
[quote]
I put a 270 degree sweep UMA in while upgrading the electrics / panel. It was good for the first two hours
Rick Girard
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John Hauck
MKIII/912ULS
hauck's holler
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Tue Sep 15, 2009 12:29 pm Post subject: Re: Tachometers |
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Rick,
I can't answer your question but would like to suggest using a portable optical tach to check accuracy on any tach you use. They are available from many aircraft supplier sources. Shop around to save some money. I think I paid around $50 for mine a few years ago.
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Thom Riddle
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Tue Sep 15, 2009 12:55 pm Post subject: Tachometers |
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I think I paid around $50 for mine a few years ago.
| Quote: |
--------
Thom Riddle
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I use a radio control aircraft prop tach. Got it on line for about $25.00.
Has 2, 3, and I think 4 blade capability. Works great. Yes, I check new
tachs and do a periodic tach check as I build hours.
john h
mkIII
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John Hauck
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slyck(at)frontiernet.net
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| Posted: Tue Sep 15, 2009 1:46 pm Post subject: Tachometers |
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I have a Sunpro automotive full sweep, mainly because tachs for 3 cylinder engines are hard to find.I tried to accommodate a Tiny tach but that thing ended up as my hour meter.
If you are using this on a 4 stroker it will work fine. Nice big readable dial with an adjustable shift pointer.
Unfortunately I never get beyond second gear.
I didn't want to squint at that creepy little westach arc dial.
BB
On 15, Sep 2009, at 4:08 PM, Richard Girard wrote:
[quote]Here at the house where tachometers go to die or malfunction, I've had another casualty. I put a 270 degree sweep UMA in while upgrading the electrics / panel. It was good for the first two hours then the needle started to wobble over a 400 rpm range at full throttle and would steady when power came back below 6000 rpm. By the fifth hour that wobbling is down to 5400 rpm and readings are otherwise erratic, too. First take off with two blade prop tach read 6300 to 6500 rpm in climb at max wobble. Last of four take offs and full throttle reading was 5800 at top of wobble. Of course warranty expired last month. Tech guy at UMA said to try a 300 ohm resistor between tach signal and ground and see it that makes it steady, otherwise, send it back. Not impressed with five hour MTBF. Did a break in on customers 447 with new Westach. Had to repeat the entire break in when I discovered it was reading rpm off about 1/3 low. Really not impressed with failure out of the box.
So the question is, anyone running an AVI or MGL digital tach? If I can't have a big sweep, I'll settle for big numbers on a digital read out.
Rick Girard
do not archive
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aslsa.rng(at)gmail.com
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| Posted: Tue Sep 15, 2009 2:47 pm Post subject: Tachometers |
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Sorry I didn't get the info. The Mk III has a grey head 582 with CDI.
Rick Girard
do not archive
On Tue, Sep 15, 2009 at 4:10 PM, robert bean <slyck(at)frontiernet.net (slyck(at)frontiernet.net)> wrote:
[quote] I have a Sunpro automotive full sweep, mainly because tachs for 3 cylinder engines are hard to find.I tried to accommodate a Tiny tach but that thing ended up as my hour meter.
If you are using this on a 4 stroker it will work fine. Nice big readable dial with an adjustable shift pointer.
Unfortunately I never get beyond second gear.
I didn't want to squint at that creepy little westach arc dial.
BB
On 15, Sep 2009, at 4:08 PM, Richard Girard wrote:
| Quote: | Here at the house where tachometers go to die or malfunction, I've had another casualty. I put a 270 degree sweep UMA in while upgrading the electrics / panel. It was good for the first two hours then the needle started to wobble over a 400 rpm range at full throttle and would steady when power came back below 6000 rpm. By the fifth hour that wobbling is down to 5400 rpm and readings are otherwise erratic, too. First take off with two blade prop tach read 6300 to 6500 rpm in climb at max wobble. Last of four take offs and full throttle reading was 5800 at top of wobble. Of course warranty expired last month. Tech guy at UMA said to try a 300 ohm resistor between tach signal and ground and see it that makes it steady, otherwise, send it back. Not impressed with five hour MTBF. Did a break in on customers 447 with new Westach. Had to repeat the entire break in when I discovered it was reading rpm off about 1/3 low. Really not impressed with failure out of the box.
So the question is, anyone running an AVI or MGL digital tach? If I can't have a big sweep, I'll settle for big numbers on a digital read out.
Rick Girard
do not archive
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mdnanwelch7(at)hotmail.co
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| Posted: Tue Sep 15, 2009 3:46 pm Post subject: Tachometers |
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Mr. Bob (Bean) C
I have a Sunpro 2 5/8" automotive tach for my GEO 3 cyl. C also. I have had it recalibrated to work accurately with a 3 cylinder engine. Have you?
If you would like to know how to set it up properly C let me know.
Mike Welch
MkIIICX
From: slyck(at)frontiernet.net
Subject: Re: Tachometers
Date: Tue C 15 Sep 2009 17:10:21 -0400
To: kolb-list(at)matronics.com
I have a Sunpro automotive full sweep C mainly because tachs for 3 cylinder engines are hard to find. I tried to accommodate a Tiny tach but that thing ended up as my hour meter.
If you are using this on a 4 stroker it will work fine. Nice big readable dial with an adjustable shift pointer.
Unfortunately I never get beyond second gear.
I didn't want to squint at that creepy little westach arc dial.
BB
On 15 C Sep 2009 C at 4:08 PM C Richard Girard wrote:
| Quote: | Here at the house where tachometers go to die or malfunction C I've had another casualty. I put a 270 degree sweep UMA in while upgrading the electrics / panel. It was good for the first two hours then the needle started to wobble over a 400 rpm range at full throttle and would steady when power came back below 6000 rpm. By the fifth hour that wobbling is down to 5400 rpm and readings are otherwise erratic C too. First take off with two blade prop tach read 6300 to 6500 rpm in climb at max wobble. Last of four take offs and full throttle reading was 5800 at top of wobble. Of course warranty expired last month. Tech guy at UMA said to try a 300 ohm resistor between tach signal and ground and see it that makes it steady C otherwise C send it back. Not impressed with five hour MTBF. Did a break in on customers 447 with new Westach. Had to repeat the entire break in when I discovered it was reading rpm off about 1/3 low. Really not impressed with failure out of the box.
So the question is C anyone running an AVI or MGL digital tach? If I can't have a big sweep C I'll settle for big numbers on a digital read out.
Rick Girard
do not archive
| Quote: |
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slyck(at)frontiernet.net
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| Posted: Tue Sep 15, 2009 3:54 pm Post subject: Tachometers |
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Hi Mr Mike. I clicked the little DIP switch in the back and went for it. I should check it against my optical handheld.Where is the adjustment if I might want to?
I have over 100 hours of looking at that thing and it has performed perfectly. It is the one gauge that I monitor closely.
BB
On 15, Sep 2009, at 7:26 PM, Mike Welch wrote:
| Quote: | Mr. Bob (Bean),
I have a Sunpro 2 5/8" automotive tach for my GEO 3 cyl., also. I have had it recalibrated to work accurately with a 3 cylinder engine. Have you?
If you would like to know how to set it up properly, let me know.
Mike Welch
MkIIICX
From: slyck(at)frontiernet.net (slyck(at)frontiernet.net)
Subject: Re: Tachometers
Date: Tue, 15 Sep 2009 17:10:21 -0400
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
I have a Sunpro automotive full sweep, mainly because tachs for 3 cylinder engines are hard to find.I tried to accommodate a Tiny tach but that thing ended up as my hour meter.
If you are using this on a 4 stroker it will work fine. Nice big readable dial with an adjustable shift pointer.
Unfortunately I never get beyond second gear.
I didn't want to squint at that creepy little westach arc dial.
BB
On 15, Sep 2009, at 4:08 PM, Richard Girard wrote:
| Quote: | Here at the house where tachometers go to die or malfunction, I've had another casualty. I put a 270 degree sweep UMA in while upgrading the electrics / panel. It was good for the first two hours then the needle started to wobble over a 400 rpm range at full throttle and would steady when power came back below 6000 rpm. By the fifth hour that wobbling is down to 5400 rpm and readings are otherwise erratic, too. First take off with two blade prop tach read 6300 to 6500 rpm in climb at max wobble. Last of four take offs and full throttle reading was 5800 at top of wobble. Of course warranty expired last month. Tech guy at UMA said to try a 300 ohm resistor between tach signal and ground and see it that makes it steady, otherwise, send it back. Not impressed with five hour MTBF.Did a break in on customers 447 with new Westach. Had to repeat the entire break in when I discovered it was reading rpm off about 1/3 low. Really not impressed with failure out of the box.
So the question is, anyone running an AVI or MGL digital tach? If I can't have a big sweep, I'll settle for big numbers on a digital read out.
Rick Girard
do not archive
ttp://www.matronics.com/Navigator?Kolb-List
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Tue Sep 15, 2009 4:15 pm Post subject: Tachometers |
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Rick:
Got just what you need, a VDO 3 1/8" 270 degree or full sweep tach. Had it in my mkIII when I was flying the 582. Worked like a charm. Been sitting on the bench since 1994.
It is yours or any one else's that wants it. It will work with a 503 and a 582.
If interested, I'll take whatever you think it is worth to you, $25.00 or less. Think I paid about $65.00 for it back then.
john h
mkIII
Rock House, Oregon - Only problem, it is at hauck's holler, alabama.
[quote] ---
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slyck(at)frontiernet.net
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| Posted: Tue Sep 15, 2009 4:17 pm Post subject: Tachometers |
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sorry, thought the reply was direct. duhBB
On 15, Sep 2009, at 7:54 PM, robert bean wrote:
[quote] Hi Mr Mike. I clicked the little DIP switch in the back and went for it. I should check it against my optical handheld.Where is the adjustment if I might want to?
I have over 100 hours of looking at that thing and it has performed perfectly. It is the one gauge that I monitor closely.
BB
On 15, Sep 2009, at 7:26 PM, Mike Welch wrote:
| Quote: | Mr. Bob (Bean),
I have a Sunpro 2 5/8" automotive tach for my GEO 3 cyl., also. I have had it recalibrated to work accurately with a 3 cylinder engine. Have you?
If you would like to know how to set it up properly, let me know.
Mike Welch
MkIIICX
From: slyck(at)frontiernet.net (slyck(at)frontiernet.net)
Subject: Re: Tachometers
Date: Tue, 15 Sep 2009 17:10:21 -0400
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
I have a Sunpro automotive full sweep, mainly because tachs for 3 cylinder engines are hard to find.I tried to accommodate a Tiny tach but that thing ended up as my hour meter.
If you are using this on a 4 stroker it will work fine. Nice big readable dial with an adjustable shift pointer.
Unfortunately I never get beyond second gear.
I didn't want to squint at that creepy little westach arc dial.
BB
On 15, Sep 2009, at 4:08 PM, Richard Girard wrote:
| Quote: | Here at the house where tachometers go to die or malfunction, I've had another casualty. I put a 270 degree sweep UMA in while upgrading the electrics / panel. It was good for the first two hours then the needle started to wobble over a 400 rpm range at full throttle and would steady when power came back below 6000 rpm. By the fifth hour that wobbling is down to 5400 rpm and readings are otherwise erratic, too. First take off with two blade prop tach read 6300 to 6500 rpm in climb at max wobble. Last of four take offs and full throttle reading was 5800 at top of wobble. Of course warranty expired last month. Tech guy at UMA said to try a 300 ohm resistor between tach signal and ground and see it that makes it steady, otherwise, send it back. Not impressed with five hour MTBF.Did a break in on customers 447 with new Westach. Had to repeat the entire break in when I discovered it was reading rpm off about 1/3 low. Really not impressed with failure out of the box.
So the question is, anyone running an AVI or MGL digital tach? If I can't have a big sweep, I'll settle for big numbers on a digital read out.
Rick Girard
do not archive
ttp://www.matronics.com/Navigator?Kolb-List
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aslsa.rng(at)gmail.com
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| Posted: Tue Sep 15, 2009 4:45 pm Post subject: Tachometers |
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Done. When you get back let me know and I'll send you the money.
Rick
On Tue, Sep 15, 2009 at 6:57 PM, John Hauck <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)> wrote:
[quote] Rick:
Got just what you need, a VDO 3 1/8" 270 degree or full sweep tach. Had it in my mkIII when I was flying the 582. Worked like a charm. Been sitting on the bench since 1994.
It is yours or any one else's that wants it. It will work with a 503 and a 582.
If interested, I'll take whatever you think it is worth to you, $25.00 or less. Think I paid about $65.00 for it back then.
john h
mkIII
Rock House, Oregon - Only problem, it is at hauck's holler, alabama.
[quote] ---
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mdnanwelch7(at)hotmail.co
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| Posted: Tue Sep 15, 2009 4:45 pm Post subject: Tachometers |
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Mr. Bob C
As we all know C a tachometer is a simple pulse counter. It also may have a dividing or multiplying function C and C as an example C for every electrical pulse C it registers the accurate engine revs per minute.
Most tachs come calibrated to work with the most common engine cylinder models C namely 4 C 6 & 8 cylinder engines. Again C most tachs will reflect the proper rpm when the little switch in the back is clicked to appropriate setting. The factory technician adjusts the internal potentiometer for each mode.
I'll explain it a little clearer. Let's say we have a 4 cylinder C 4 cycle engine C like a Rotax 912.
The tachometer receives an electronic pulse every cylinder "fire" (which happens to be every other cylinder rotation). Inside the tach C there is an adjustable resister C a potentiometer. The factory tech would have adjusted that "pot" to make the needle reflect the engine's accurate rpm (at the factory C they'd likely use an occilloscope C and a pulse generator for the actual calibration)
Next C the tech would click the little switch to the 6 cylinder setting C etc. etc. Lastly C the 8 cylinder.
Now C as you know C there are very few (if any) 3 cylinder tachs. It's not that the internal guts of a 3 cylinder tach is any different than any other tach C it's just there aren't very many three cylinder 4 cycle engines.
So C for us rare guys that need a 3 cylinder tach C we can simply take the tach apart C turn the little potentiometer to a known desired rpm C and we're "good to go". (this is where that handheld tach really comes in handy!!) We just dial our Sunpro to read what the handheld says.
I'll see if I can come up with a photo of the potentiometer you'd be looking for.
Note: I have a large size Sunpro C calibrated with an ocilloscope. I don't like it. Too big. I have since bought a brand new smaller Sunpro. I will use the larger model to calibrate the engine rpms to the smaller model. I have to wait until I have the engine running C to do that. Hopefully C I'll have it running by Christmas.
For a guy to set a Sunpro up to work with a 3 cylinder C you'd want to first click it to the 4 cylinder setting. Then C dial the potentiometer to match you handheld tach. Easy. Now C I'll go look for the photo of the insides of the tach.........
Mike Welch
MkIII CX
From: slyck(at)frontiernet.net
Subject: Re: Tachometers
Date: Tue C 15 Sep 2009 19:54:19 -0400
To: kolb-list(at)matronics.com
Hi Mr Mike. I clicked the little DIP switch in the back and went for it. I should check it against my optical handheld. Where is the adjustment if I might want to?
I have over 100 hours of looking at that thing and it has performed perfectly. It is the one gauge that I monitor closely.
BB
On 15 C Sep 2009 C at 7:26 PM C Mike Welch wrote:
| Quote: | Mr. Bob (Bean) C
I have a Sunpro 2 5/8" automotive tach for my GEO 3 cyl. C also. I have had it recalibrated to work accurately with a 3 cylinder engine. Have you?
If you would like to know how to set it up properly C let me know.
Mike Welch
MkIIICX
From: slyck(at)frontiernet.net (slyck(at)frontiernet.net)
Subject: Re: Tachometers
Date: Tue C 15 Sep 2009 17:10:21 -0400
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
I have a Sunpro automotive full sweep C mainly because tachs for 3 cylinder engines are hard to find. I tried to accommodate a Tiny tach but that thing ended up as my hour meter.
If you are using this on a 4 stroker it will work fine. Nice big readable dial with an adjustable shift pointer.
Unfortunately I never get beyond second gear.
I didn't want to squint at that creepy little westach arc dial.
BB
On 15 C Sep 2009 C at 4:08 PM C Richard Girard wrote:
| Quote: | Here at the house where tachometers go to die or malfunction C I've had another casualty. I put a 270 degree sweep UMA in while upgrading the electrics / panel. It was good for the first two hours then the needle started to wobble over a 400 rpm range at full throttle and would steady when power came back below 6000 rpm. By the fifth hour that wobbling is down to 5400 rpm and readings are otherwise erratic C too. First take off with two blade prop tach read 6300 to 6500 rpm in climb at max wobble. Last of four take offs and full throttle reading was 5800 at top of wobble. Of course warranty expired last month. Tech guy at UMA said to try a 300 ohm resistor between tach signal and ground and see it that makes it steady C otherwise C send it back. Not impressed with five hour MTBF. Did a break in on customers 447 with new Westach. Had to repeat the entire break in when I discovered it was reading rpm off about 1/3 low. Really not impressed with failure out of the box.
So the question is C anyone running an AVI or MGL digital tach? If I can't have a big sweep C I'll settle for big numbers on a digital read out.
Rick Girard
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slyck(at)frontiernet.net
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| Posted: Tue Sep 15, 2009 5:22 pm Post subject: Tachometers |
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Mike, mine already had the 3 cylinder switchability. One click and it worked. I MIGHT check it against the handheld but I doubt that it is off by much.
I like the large dial so I can see it with my astigmatic eyeballs..
I REALLY like the tach in the prewar Taylorcrafts. About the size of a pie plate with a big old sweep hand with a pointer on the end.
Can't miss that one.
BB
On 15, Sep 2009, at 8:41 PM, Mike Welch wrote:
| Quote: | Mr. Bob,
As we all know, a tachometer is a simple pulse counter. It also may have a dividing or multiplying function, and, as an example, for every electrical pulse, it registers the accurate engine revs per minute.
Most tachs come calibrated to work with the most common engine cylinder models, namely 4, 6 & 8 cylinder engines. Again, most tachs will reflect the proper rpm when the little switch in the back is clicked to appropriate setting. The factory technician adjusts the internal potentiometer for each mode.
I'll explain it a little clearer. Let's say we have a 4 cylinder, 4 cycle engine, like a Rotax 912.
The tachometer receives an electronic pulse every cylinder "fire" (which happens to be every other cylinder rotation). Inside the tach, there is an adjustable resister, a potentiometer. The factory tech would have adjusted that "pot" to make the needle reflect the engine's accurate rpm (at the factory, they'd likely use an occilloscope, and a pulse generator for the actual calibration)
Next, the tech would click the little switch to the 6 cylinder setting, etc. etc. Lastly, the 8 cylinder.
Now, as you know, there are very few (if any) 3 cylinder tachs. It's not that the internal guts of a 3 cylinder tach is any different than any other tach, it's just there aren't very many three cylinder 4 cycle engines.
So, for us rare guys that need a 3 cylinder tach, we can simply take the tach apart, turn the little potentiometer to a known desired rpm, and we're "good to go". (this is where that handheld tach really comes in handy!!) We just dial our Sunpro to read what the handheld says.
I'll see if I can come up with a photo of the potentiometer you'd be looking for.
Note: I have a large size Sunpro, calibrated with an ocilloscope. I don't like it. Too big. I have since bought a brand new smaller Sunpro. I will use the larger model to calibrate the engine rpms to the smaller model. I have to wait until I have the engine running, to do that. Hopefully, I'll have it running by Christmas.
For a guy to set a Sunpro up to work with a 3 cylinder, you'd want to first click it to the 4 cylinder setting. Then, dial the potentiometer to match you handheld tach. Easy. Now, I'll go look for the photo of the insides of the tach.........
Mike Welch
MkIII CX
From: slyck(at)frontiernet.net (slyck(at)frontiernet.net)
Subject: Re: Tachometers
Date: Tue, 15 Sep 2009 19:54:19 -0400
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
Hi Mr Mike. I clicked the little DIP switch in the back and went for it. I should check it against my optical handheld.Where is the adjustment if I might want to?
I have over 100 hours of looking at that thing and it has performed perfectly. It is the one gauge that I monitor closely.
BB
On 15, Sep 2009, at 7:26 PM, Mike Welch wrote:
| Quote: | Mr. Bob (Bean),
I have a Sunpro 2 5/8" automotive tach for my GEO 3 cyl., also. I have had it recalibrated to work accurately with a 3 cylinder engine. Have you?
If you would like to know how to set it up properly, let me know.
Mike Welch
MkIIICX
From: slyck(at)frontiernet.net (slyck(at)frontiernet.net)
Subject: Re: Tachometers
Date: Tue, 15 Sep 2009 17:10:21 -0400
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
I have a Sunpro automotive full sweep, mainly because tachs for 3 cylinder engines are hard to find.I tried to accommodate a Tiny tach but that thing ended up as my hour meter.
If you are using this on a 4 stroker it will work fine. Nice big readable dial with an adjustable shift pointer.
Unfortunately I never get beyond second gear.
I didn't want to squint at that creepy little westach arc dial.
BB
On 15, Sep 2009, at 4:08 PM, Richard Girard wrote:
| Quote: | Here at the house where tachometers go to die or malfunction, I've had another casualty. I put a 270 degree sweep UMA in while upgrading the electrics / panel. It was good for the first two hours then the needle started to wobble over a 400 rpm range at full throttle and would steady when power came back below 6000 rpm. By the fifth hour that wobbling is down to 5400 rpm and readings are otherwise erratic, too. First take off with two blade prop tach read 6300 to 6500 rpm in climb at max wobble. Last of four take offs and full throttle reading was 5800 at top of wobble. Of course warranty expired last month. Tech guy at UMA said to try a 300 ohm resistor between tach signal and ground and see it that makes it steady, otherwise, send it back. Not impressed with five hour MTBF.Did a break in on customers 447 with new Westach. Had to repeat the entire break in when I discovered it was reading rpm off about 1/3 low. Really not impressed with failure out of the box.
So the question is, anyone running an AVI or MGL digital tach? If I can't have a big sweep, I'll settle for big numbers on a digital read out.
Rick Girard
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slyck(at)frontiernet.net
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| Posted: Tue Sep 15, 2009 5:26 pm Post subject: tachometers |
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Ah, I was in luck. here we are:
nice CCW rotation
excellent steering wheels
130 VNE
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Tue Sep 15, 2009 5:38 pm Post subject: tachometers |
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> nice CCW rotation
| Quote: | excellent steering wheels
130 VNE
|
Bob Bean/Gang:
One could do chin ups on the tach needle.
Beautiful gauge.
I like gauges over digital and thermometer type stuff.
Guess I am old fashioned, but that is ok too. I came from that generation.
john h
mkIII
DO NOT ARCHIVE
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John Hauck
MKIII/912ULS
hauck's holler
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Richard Pike
Joined: 09 Jan 2006
Posts: 1670
Location: Blountville, Tennessee
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| Posted: Tue Sep 15, 2009 5:39 pm Post subject: Re: Tachometers |
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[quote="aslsa.rng(at)gmail.com"]Sorry I didn't get the info. The Mk III has a grey head 582 with CDI.
Rick Girard
do not archive
*****************************************
Sounds like the foolishness I went through with my 582 several years ago. Changed tachs, changed regulator/rectifiers, finally ended up talking with Phil Lockwood. He said it sounded like the coil in the engine, the one that is at the other end of the gray tach wire in the harness. He said that was a known problem for Rotax 582's, and said he could fix it, but no promises on how long it would last. He suggested I get a Tiny Tach. I did, it is still working perfect.
Richard Pike
MKIII N420P (420ldPoops)
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mdnanwelch7(at)hotmail.co
Guest
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| Posted: Tue Sep 15, 2009 5:42 pm Post subject: Tachometers |
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Hi Bob C
Wow C I never heard of the Sunpro coming with the 3 cylinder choice.
Just in case anyone else is interested C I took a few photos of my larger Sunpro internals.
If a person wanted to adjust it to work with a 3 cylinder C instead of a 4 cylinder C you'd have to adjust one of the little potentiometers I pointed in out in one of the photos. Which potentiometer?? I didn't look to see. You'd have to find which one is activated when the switch is in the 4 cylinder position. (not too hard to see which pot the switch is pointing at)
Mike Welch
MkIII CX
From: slyck(at)frontiernet.net
Subject: Re: Tachometers
Date: Tue C 15 Sep 2009 21:19:09 -0400
To: kolb-list(at)matronics.com
Mike C mine already had the 3 cylinder switchability. One click and it worked. I MIGHT check it against the handheld but I doubt that it is off by much.
I like the large dial so I can see it with my astigmatic eyeballs..
I REALLY like the tach in the prewar Taylorcrafts. About the size of a pie plate with a big old sweep hand with a pointer on the end.
Can't miss that one.
BB
On 15 C Sep 2009 C at 8:41 PM C Mike Welch wrote:
| Quote: | Mr. Bob C
As we all know C a tachometer is a simple pulse counter. It also may have a dividing or multiplying function C and C as an example C for every electrical pulse C it registers the accurate engine revs per minute.
Most tachs come calibrated to work with the most common engine cylinder models C namely 4 C 6 & 8 cylinder engines. Again C most tachs will reflect the proper rpm when the little switch in the back is clicked to appropriate setting. The factory technician adjusts the internal potentiometer for each mode.
I'll explain it a little clearer. Let's say we have a 4 cylinder C 4 cycle engine C like a Rotax 912.
The tachometer receives an electronic pulse every cylinder "fire" (which happens to be every other cylinder rotation). Inside the tach C there is an adjustable resister C a potentiometer. The factory tech would have adjusted that "pot" to make the needle reflect the engine's accurate rpm (at the factory C they'd likely use an occilloscope C and a pulse generator for the actual calibration)
Next C the tech would click the little switch to the 6 cylinder setting C etc. etc. Lastly C the 8 cylinder.
Now C as you know C there are very few (if any) 3 cylinder tachs. It's not that the internal guts of a 3 cylinder tach is any different than any other tach C it's just there aren't very many three cylinder 4 cycle engines.
So C for us rare guys that need a 3 cylinder tach C we can simply take the tach apart C turn the little potentiometer to a known desired rpm C and we're "good to go". (this is where that handheld tach really comes in handy!!) We just dial our Sunpro to read what the handheld says.
I'll see if I can come up with a photo of the potentiometer you'd be looking for.
Note: I have a large size Sunpro C calibrated with an ocilloscope. I don't like it. Too big. I have since bought a brand new smaller Sunpro. I will use the larger model to calibrate the engine rpms to the smaller model. I have to wait until I have the engine running C to do that. Hopefully C I'll have it running by Christmas.
For a guy to set a Sunpro up to work with a 3 cylinder C you'd want to first click it to the 4 cylinder setting. Then C dial the potentiometer to match you handheld tach. Easy. Now C I'll go look for the photo of the insides of the tach.........
Mike Welch
MkIII CX
From: slyck(at)frontiernet.net (slyck(at)frontiernet.net)
Subject: Re: Tachometers
Date: Tue C 15 Sep 2009 19:54:19 -0400
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
Hi Mr Mike. I clicked the little DIP switch in the back and went for it. I should check it against my optical handheld. Where is the adjustment if I might want to?
I have over 100 hours of looking at that thing and it has performed perfectly. It is the one gauge that I monitor closely.
BB
On 15 C Sep 2009 C at 7:26 PM C Mike Welch wrote:
| Quote: | Mr. Bob (Bean) C
I have a Sunpro 2 5/8" automotive tach for my GEO 3 cyl. C also. I have had it recalibrated to work accurately with a 3 cylinder engine. Have you?
If you would like to know how to set it up properly C let me know.
Mike Welch
MkIIICX
From: slyck(at)frontiernet.net (slyck(at)frontiernet.net)
Subject: Re: Kolb-List: Tachometers
Date: Tue C 15 Sep 2009 17:10:21 -0400
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
I have a Sunpro automotive full sweep C mainly because tachs for 3 cylinder engines are hard to find. I tried to accommodate a Tiny tach but that thing ended up as my hour meter.
If you are using this on a 4 stroker it will work fine. Nice big readable dial with an adjustable shift pointer.
Unfortunately I never get beyond second gear.
I didn't want to squint at that creepy little westach arc dial.
BB
On 15 C Sep 2009 C at 4:08 PM C Richard Girard wrote:
| Quote: | Here at the house where tachometers go to die or malfunction C I've had another casualty. I put a 270 degree sweep UMA in while upgrading the electrics / panel. It was good for the first two hours then the needle started to wobble over a 400 rpm range at full throttle and would steady when power came back below 6000 rpm. By the fifth hour that wobbling is down to 5400 rpm and readings are otherwise erratic C too. First take off with two blade prop tach read 6300 to 6500 rpm in climb at max wobble. Last of four take offs and full throttle reading was 5800 at top of wobble. Of course warranty expired last month. Tech guy at UMA said to try a 300 ohm resistor between tach signal and ground and see it that makes it steady C otherwise C send it back. Not impressed with five hour MTBF. Did a break in on customers 447 with new Westach. Had to repeat the entire break in when I discovered it was reading rpm off about 1/3 low. Really not impressed with failure out of the box.
So the question is C anyone running an AVI or MGL digital tach? If I can't have a big sweep C I'll settle for big numbers on a digital read out.
Rick Girard
do not archive
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ronics.com
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ronics.com
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slyck(at)frontiernet.net
Guest
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| Posted: Tue Sep 15, 2009 5:58 pm Post subject: tachometers |
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Speaking of old airplanes......
(got to browsing) here is a Dormoy Bathtub:
pretty skinny boom tube, good thing it's braced.
very Kolb looking wingtips.
also do not archive
On 15, Sep 2009, at 9:37 PM, John Hauck wrote:
| Quote: |
> nice CCW rotation
> excellent steering wheels
> 130 VNE
>
Bob Bean/Gang:
One could do chin ups on the tach needle.
Beautiful gauge.
I like gauges over digital and thermometer type stuff.
Guess I am old fashioned, but that is ok too. I came from that
generation.
john h
mkIII
DO NOT ARCHIVE
|
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2danglico
Joined: 08 Sep 2008
Posts: 17
Location: Seneca SC
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| Posted: Thu Sep 17, 2009 4:30 am Post subject: Re: Tachometers |
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Recently I replaced my instr. panel to make room for my GPS. I decided to leave out my needle sweep tach and go with just the tiny tach. It was the one I referenced while flying, because it was easier to see - and discern 5400 from 5500, used less space, and while I've only had it timed once, proved to be balls on accurate.
John Tempest
Firestar 447
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