V-Man
Member
Registered: 7th Feb 05
Location: Iwade, Sittingbourne
User status: Offline
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I did a compression test on my car t'other day.....results were that it took a few engine turns to build the compression up, all pistons went something 8, 9-10, 12-13, 14-15 then leveled out at 15.5-16.
i thought this gradual increase in compression meant something bad??? but i cant remeber where i read it. Ooorrrrr is it normal as all 4 cylinders have done it??
just a wonderin!
cheers! dave 
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ed
Member
Registered: 10th Sep 03
User status: Offline
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When you do a compression test you should find out what the book tolerences are (should be something like between X psi and Y psi). You then do a dry test, and then do a wet test after pouring a little oil in the bores. If the pressure has increased from below the minimum tolerence to a higher pressure you have a problem with the piston rings. If the pressure is below the minimum pressure and stays below the minimum pressure when wet you have a head gasket problem. Also, all the pistons should be the same, if not very similar pressures. Yours sounds fine...
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V-Man
Member
Registered: 7th Feb 05
Location: Iwade, Sittingbourne
User status: Offline
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i thought that u done the test dry (which is what i did) and if a cylinder has a lower compression than the rest then u wet tested it to discover the problem? but yea, they all done exactly the same dry, so its probably all fine or all funked!  . might do it wet soon then!
cheers! 
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ed
Member
Registered: 10th Sep 03
User status: Offline
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Yea, your right.. It's late, I must have explained it in some god awfull way
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