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post #1 of (permalink) Old 01-01-2001, 10:32 AM
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compression test how to???

how do i do a compression test on a used sled i'm looking to buy?

attach the gauge and "pull-start" the engine over??
use the elec start??


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post #2 of (permalink) Old 01-01-2001, 02:00 PM
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Re: compression test how to???

Pull all the spark plugs out.Screw the guage into one of the holes. Turn over the engine, either by the pull rope or the electric start, 4-5 pulls with the cord- 4-5 seconds on the starter. Repeat for the other holes. Make sure you bleed off the air out of the guage each time. (there's a little valve up by the guage) Compression for an XLT should be around 115-125 PSI, but most importantly they should be even across all the cylinders.
post #3 of (permalink) Old 01-02-2001, 08:22 PM
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Re: compression test how to???

the earlier post is right on except they dont have to be the same but no more than 10 psi diffrence on any cylinder

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post #4 of (permalink) Old 01-05-2001, 01:34 AM
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Re: compression test how to???

Make sure you hold throttle wfo for accurate compression test. This is reccomended by psi, slp,crank shop and most other high performance shops to get a better idea of engine condition using dynamic compression also.

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