how to do a wet compression test?

[JdrifterCA]

Just did a compression test, and it read 149. to check if the piston rings are worn, do i just add some oil through the sparkplug hole and than test again? How much oil to add?

[chicos240]

Yes, count to 5.Also what type of engine, if its an SR, you are ok. If its a KA i think thats a bit high, but you should be fine.

[JdrifterCA]

wuts normal compression for KA? i redid the test again with the engine fully warmed up and it reads 160/150/150/160. How much oil to add?

[chicos240]

[VanguishRacing]

wuts normal compression for KA? i redid the test again with the engine fully warmed up and it reads 160/150/150/160. How much oil to add?

i'm not sure if you have a ka or sr, but for what i learn on sr20 is that if your have all 150 for all cylinder you have a normal motor actually is good. but if you have like you said 160 150 150 160 is not good or maybe is good for Ka motor. i have all 150's for sr20. just to let you know. if you have sign of oil on the tread of the spark plug meaning you might have a bad piston rings or spark plug o-ring seal. as long there is not a lot of oil on the plugs. if it is..is BAD