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                           RV-List Digest Archive
                                      ---
                     Total Messages Posted Tue 06/21/11: 3
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Today's Message Index:
----------------------
 
     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  _____________________________________


Time: 08:17:50 PM PST US
Subject: RV-List: compression test and mag timing equipment
From: thomas sargent <sarg314@gmail.com>

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  _____________________________________


Time: 08:34:08 PM PST US
From: "Kyle Boatright" <kboatright1@comcast.net>
Subject: Re: RV-List: 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  _____________________________________


Time: 08:34:42 PM PST US
From: Kelly McMullen <kellym@aviating.com>
Subject: Re: RV-List: 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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