Today's Message Index:
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1. 08:17 PM - compression test and mag timing equipment (thomas sargent)
2. 08:34 PM - Re: compression test and mag timing equipment (Kyle Boatright)
3. 08:34 PM - Re: compression test and mag timing equipment (Kelly McMullen)
Message 1
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Subject: | compression test and mag timing equipment |
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
Message 2
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Subject: | Re: compression test and mag timing equipment |
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
----- Original Message -----
From: thomas sargent
To: rv-list
Sent: Tuesday, June 21, 2011 11:13 PM
Subject: RV-List: compression test and mag timing equipment
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
Message 3
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Subject: | Re: compression test and mag timing equipment |
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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