Thread: Compression
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#9: 01-05-2013, 01:24 PM
johnegg's Avatar
Title: Flying W00t Monkey
Location: virginia
Car: 98 obw, 97 GT w/ ej22, '01 H6 VDC
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What would be the normal cranking PSI on a 98 2.5 that was turned over by hand?
there is not going to be a spec for this.

compression test should be done with all plugs removed on a warm engine with the starter cranking the engine.obviously this is not possible.

a few things,
1/ before you assume the rings are bad, check the timing. if the timing has jumped the compression will be off.
2/ hand crank the and stop with the each piston at TDC and listen for escaping noise in the intake or the exhaust. again if the timing is off you may not learn any thing.
3/ bent valves due to a busted timing belt are much more likely cause. or maybe a burnt valve. bad rings are very very very rare.
4/ it is WAY WAY WAY cheaper to find a good used engine than to rebuild one. even a JDM import will be cheaper, but you will have to add the EGR.

but before i spent a dime on an engine or a rebuild, i would check the timing and then pull the head on the low pressure side and see if the valves leak.

what is the history of the engine??

good luck.

Last edited by johnegg; 01-05-2013 at 01:48 PM..