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stevlynn(at)bellsouth.net
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 Posted: Fri Apr 15, 2011 9:56 am Post subject: EGT/CHT combination guage |
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I am looking for another hole to mount an additional flight instrument in a Kolb Firefly panel. I’m considering removing the dual EGT gauge and the dual CHT gauge, and replacing with a combination EGT/CHT gauge. Am I giving up more than I really should in terms of Rotax 447 engine operation?
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Sat Apr 16, 2011 6:39 am Post subject: Re: EGT/CHT combination guage |
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| stevlynn(at)bellsouth.net wrote: | I am looking for another hole to mount an additional flight instrument in a Kolb Firefly panel. I’m considering removing the dual EGT gauge and the dual CHT gauge, and replacing with a combination EGT/CHT gauge. Am I giving up more than I really should in terms of Rotax 447 engine operation?
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You should be fine, especially if your 447 is the single carb version. Just put the remaining CHT and EGT's on the hottest cylinders. If you have dual carbs, you run the (fairly low) risk of something happening to the non-monitored cylinder's carb and it not showing up as an EGT spike or dip, etc. But with a single, it'll show up on either cylinder. So IMO I say no problem....
LS
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LS
Titan II SS |
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bob(at)fly-ul.com
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| Posted: Sat Apr 16, 2011 1:08 pm Post subject: EGT/CHT combination guage |
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I think you should have two EGT gauges. You can't mount a single prob in the correct spot and expect to monitor both cylinders. Single carb or dual carb, I believe two EGTs are important. There probably is a single gauge available that has both dual EGT and CHT in one unit
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Bob Comperini
On Apr 16, 2011, at 7:39 AM, "lucien" <lstavenhagen(at)hotmail.com> wrote:
| Quote: |
stevlynn(at)bellsouth.net wrote:
> I am looking for another hole to mount an additional flight instrument in a Kolb Firefly panel. I’m considering removing the dual EGT gauge and the dual CHT gauge, and replacing with a combination EGT/CHT gauge. Am I giving up more than I really should in terms of Rotax 447 engine operation?
>
You should be fine, especially if your 447 is the single carb version. Just put the remaining CHT and EGT's on the hottest cylinders. If you have dual carbs, you run the (fairly low) risk of something happening to the non-monitored cylinder's carb and it not showing up as an EGT spike or dip, etc. But with a single, it'll show up on either cylinder. So IMO I say no problem....
LS
--------
LS
Titan II SS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=337126#337126
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thesupe(at)hotmail.com
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| Posted: Sat Apr 16, 2011 6:30 pm Post subject: EGT/CHT combination guage |
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Here is a solution to your problem. On my Avid Flyer with a Jabiru engine I installed a 4 position Westach switch that switches the EGT and CHT probes from one cylinder to the next. At this time I have seperate EGT and CHT gauges, but I'm going to switch to a single gauge to monitor both. The westach switch comes wired up to just do one set of 4 probes but the switch has 2 extra conections for each cylinder position so I wired up the CHT probes to the second set of conections and it works just fine. With your two stroke, you wouldn't use cylinder 3 and 4 connections at all. Take care, Jim Chuk
> Subject: Re: Re: EGT/CHT combination guage
| Quote: | From: bob(at)fly-ul.com
Date: Sat, 16 Apr 2011 14:02:05 -0700
To: rotaxengines-list(at)matronics.com
--> RotaxEngines-List message posted by: Bob Comperini <bob(at)fly-ul.com>
I think you should have two EGT gauges. You can't mount a single prob in the correct spot and expect to monitor both cylinders. Single carb or dual carb, I believe two EGTs are important. There probably is a single gauge available that has both dual EGT and CHT in one unit
--
Bob Comperini
On Apr 16, 2011, at 7:39 AM, "lucien" <lstavenhagen(at)hotmail.com> wrote:
> --> RotaxEngines-List message posted by: "lucien" <lstavenhagen(at)hotmail.com>
>
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> stevlynn(at)bellsouth.net wrote:
>> I am looking for another hole to mount an additional flight instrument in a Kolb Firefly panel. I’m considering removing the dual EGT gauge and the dual CHT gauge, and replacing with a combination EGT/CHT gauge. Am I giving up more than I really should in terms of Rotax 447 engine operation?
>>
>
>
> You should be fine, especially if your 447 is the single carb version. Just put the remaining CHT and EGT's on the hottest cylinders. If you have dual carbs, you run the (fairly low) risk of something happening to the non-monitored cylinder's carb and it not showing up as an EGT spike or dip, etc. But with a single, it'll show up on either cylinder. So IMO I say no problem....
>
> LS
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> LS
> Titan II SS
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> Read this topic online here:
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> http://forums.matronics.com/viewtopic.php?p=337126#337126
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