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sarg314(at)gmail.com
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 Posted: Tue Jun 21, 2011 7:17 pm Post subject: compression test and mag timing equipment |
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I am getting ready to do the annual on my 6A and trying to figure out which cyl. compression tester to get. I have an IO-260-B2B. It has a 5.125" bore. I'm seeing conflicting information about the orifice size needed t\for such an engine. Is it 0.040" or 0.060"
Also, I have but 1 magneto (Lightspeed Ignition on the right). Which magneto timer should I get? Do I need anything else to time the left mag?
Thanks,
--
Tom Sargent, N811WT , RV-6A
[quote][b]
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kboatright1(at)comcast.ne
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| Posted: Tue Jun 21, 2011 7:34 pm Post subject: compression test and mag timing equipment |
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Tom,
I dunno about the compression orifice, but I bet someone on here could tell you how to verify a single mag's timing using only a continuity tester or the multimeter I bet you have in your toolbox.
Anyone wanna jump in with how to verify a single mag's timing with a multimeter and the timing marks on the flywheel?
KB
[quote] ---
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Tue Jun 21, 2011 7:34 pm Post subject: compression test and mag timing equipment |
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You can follow the old advice and use the smaller orifice(.040)
compression tester for engines less than 1000 cu. in.
http://www.aircraftspruce.com/catalog/topages/differentialcylindertester.php
A few years back they started suggesting the larger orifice(.060) for
engines 5" and larger bore. No one I know follows that advice. It will
show higher compressions which really isn't what you want. Any buzz box
magneto timer will work. This $43 unit is about as cheap as they come:
*http://www.aircraftspruce.com/catalog/topages/synchronizer.php*
Kelly
A&P/IA
EAA Tech Counselor
On 6/21/2011 8:13 PM, thomas sargent wrote:
| Quote: | I am getting ready to do the annual on my 6A and trying to figure out
which cyl. compression tester to get. I have an IO-260-B2B. It has a
5.125" bore. I'm seeing conflicting information about the orifice
size needed t\for such an engine. Is it 0.040" or 0.060"
Also, I have but 1 magneto (Lightspeed Ignition on the right). Which
magneto timer should I get? Do I need anything else to time the left mag?
Thanks,
--
Tom Sargent, N811WT , RV-6A
*
*
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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n223rv(at)wolflakeairport
Guest
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| Posted: Wed Jun 22, 2011 2:20 am Post subject: compression test and mag timing equipment |
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You Typically need one of these too!
http://www.aircraftspruce.com/catalog/topages/timing_ind.php
Sent from my iPhone
On Jun 21, 2011, at 11:32 PM, Kelly McMullen <kellym(at)aviating.com> wrote:
| Quote: |
You can follow the old advice and use the smaller orifice(.040) compression tester for engines less than 1000 cu. in.
http://www.aircraftspruce.com/catalog/topages/differentialcylindertester.php
A few years back they started suggesting the larger orifice(.060) for engines 5" and larger bore. No one I know follows that advice. It will show higher compressions which really isn't what you want. Any buzz box magneto timer will work. This $43 unit is about as cheap as they come: *http://www.aircraftspruce.com/catalog/topages/synchronizer.php*
Kelly
A&P/IA
EAA Tech Counselor
On 6/21/2011 8:13 PM, thomas sargent wrote:
> I am getting ready to do the annual on my 6A and trying to figure out which cyl. compression tester to get. I have an IO-260-B2B. It has a 5.125" bore. I'm seeing conflicting information about the orifice size needed t\for such an engine. Is it 0.040" or 0.060"
>
> Also, I have but 1 magneto (Lightspeed Ignition on the right). Which magneto timer should I get? Do I need anything else to time the left mag?
>
> Thanks,
>
> --
> Tom Sargent, N811WT , RV-6A
> *
>
>
> *
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Wed Jun 22, 2011 6:12 am Post subject: compression test and mag timing equipment |
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Waste of money, IMHO. If you want accurate timing, get/borrow a digital
level to determine exact prop position. Once you find the correct mark
on your flywheel, it isn't hard to line it up with the case halves, IF
you have marks on the engine side of the flywheel. If you only have
marks on the front side, you have to use the mark on the starter motor.
If you have questions, find an A&P to show you correct positioning...it
isn't rocket science. The flower pot isn't so useful because it needs to
be positioned on the spinner such that its surface is perpendicular with
the ground...hard to do with a tailwheel aircraft.
On 6/22/2011 3:15 AM, Michael Kraus wrote:
| Quote: |
You Typically need one of these too!
http://www.aircraftspruce.com/catalog/topages/timing_ind.php
Sent from my iPhone
On Jun 21, 2011, at 11:32 PM, Kelly McMullen<kellym(at)aviating.com> wrote:
>
>
> You can follow the old advice and use the smaller orifice(.040) compression tester for engines less than 1000 cu. in.
> http://www.aircraftspruce.com/catalog/topages/differentialcylindertester.php
> A few years back they started suggesting the larger orifice(.060) for engines 5" and larger bore. No one I know follows that advice. It will show higher compressions which really isn't what you want. Any buzz box magneto timer will work. This $43 unit is about as cheap as they come: *http://www.aircraftspruce.com/catalog/topages/synchronizer.php*
> Kelly
> A&P/IA
> EAA Tech Counselor
> On 6/21/2011 8:13 PM, thomas sargent wrote:
>> I am getting ready to do the annual on my 6A and trying to figure out which cyl. compression tester to get. I have an IO-260-B2B. It has a 5.125" bore. I'm seeing conflicting information about the orifice size needed t\for such an engine. Is it 0.040" or 0.060"
>>
>> Also, I have but 1 magneto (Lightspeed Ignition on the right). Which magneto timer should I get? Do I need anything else to time the left mag?
>>
>> Thanks,
>>
>> --
>> Tom Sargent, N811WT , RV-6A
>> *
>>
>>
>> *
>
|
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
|
_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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gyoung
Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas
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| Posted: Wed Jun 22, 2011 6:56 am Post subject: compression test and mag timing equipment |
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The flower pot is not needed on Lycomings that have a timing mark on the
flywheel. Even my GO-480 had a timing mark so perhaps all Lycomings have
one somewhere. Not so on Continentals. I had buy one for the IO-550 in my
Navion but don't need it for the RV.
Greg Young
--
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n223rv(at)wolflakeairport
Guest
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| Posted: Wed Jun 22, 2011 7:02 am Post subject: compression test and mag timing equipment |
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Interesting, used it successfully for 9 years with no problems, on my taildragger RV-4...... Inexpensive and worked great for me. And it has worked great on my RV-10 for 1 year.
Sent from my iPhone
On Jun 22, 2011, at 10:08 AM, Kelly McMullen <kellym(at)aviating.com> wrote:
| Quote: |
Waste of money, IMHO. If you want accurate timing, get/borrow a digital level to determine exact prop position. Once you find the correct mark on your flywheel, it isn't hard to line it up with the case halves, IF you have marks on the engine side of the flywheel. If you only have marks on the front side, you have to use the mark on the starter motor. If you have questions, find an A&P to show you correct positioning...it isn't rocket science. The flower pot isn't so useful because it needs to be positioned on the spinner such that its surface is perpendicular with the ground...hard to do with a tailwheel aircraft.
On 6/22/2011 3:15 AM, Michael Kraus wrote:
>
>
> You Typically need one of these too!
>
> http://www.aircraftspruce.com/catalog/topages/timing_ind.php
>
> Sent from my iPhone
>
> On Jun 21, 2011, at 11:32 PM, Kelly McMullen<kellym(at)aviating.com> wrote:
>
>>
>>
>> You can follow the old advice and use the smaller orifice(.040) compression tester for engines less than 1000 cu. in.
>> http://www.aircraftspruce.com/catalog/topages/differentialcylindertester.php
>> A few years back they started suggesting the larger orifice(.060) for engines 5" and larger bore. No one I know follows that advice. It will show higher compressions which really isn't what you want. Any buzz box magneto timer will work. This $43 unit is about as cheap as they come: *http://www.aircraftspruce.com/catalog/topages/synchronizer.php*
>> Kelly
>> A&P/IA
>> EAA Tech Counselor
>>
>>
>> On 6/21/2011 8:13 PM, thomas sargent wrote:
>>> I am getting ready to do the annual on my 6A and trying to figure out which cyl. compression tester to get. I have an IO-260-B2B. It has a 5.125" bore. I'm seeing conflicting information about the orifice size needed t\for such an engine. Is it 0.040" or 0.060"
>>>
>>> Also, I have but 1 magneto (Lightspeed Ignition on the right). Which magneto timer should I get? Do I need anything else to time the left mag?
>>>
>>> Thanks,
>>>
>>> --
>>> Tom Sargent, N811WT , RV-6A
>>> *
>>>
>>>
>>> *
>>
>>
>>
>
>
>
>
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sarg314(at)gmail.com
Guest
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| Posted: Wed Jun 22, 2011 7:14 am Post subject: compression test and mag timing equipment |
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Oops, just notice I said engine was IO-260, It is of course an IO-360-B2B. Thanks for all the info by the way.
On Tue, Jun 21, 2011 at 8:13 PM, thomas sargent <sarg314(at)gmail.com (sarg314(at)gmail.com)> wrote:
| Quote: | I am getting ready to do the annual on my 6A and trying to figure out which cyl. compression tester to get. I have an IO-260-B2B. It has a 5.125" bore. I'm seeing conflicting information about the orifice size needed t\for such an engine. Is it 0.040" or 0.060"
Also, I have but 1 magneto (Lightspeed Ignition on the right). Which magneto timer should I get? Do I need anything else to time the left mag?
Thanks,
--
Tom Sargent, N811WT , RV-6A
| Quote: |
t="_blank">http://www.matronics.com/Navigator?RV-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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--
Tom Sargent
[quote][b]
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