RV-List Digest Archive

Tue 06/21/11


Total Messages Posted: 3



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


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    Time: 08:17:50 PM PST US
    Subject: 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


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    Time: 08:34:08 PM PST US
    From: "Kyle Boatright" <kboatright1@comcast.net>
    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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    Time: 08:34:42 PM PST US
    From: Kelly McMullen <kellym@aviating.com>
    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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