compression test on rb26

[7heavn]

if a compression test is done on an rb26 what type of numbers would I be looking for ?

[shoey]

I did mine and got a reading of 177-185psi across the lot. I think that the actual reading doesn't matter too much (I think the manual has 150psi as minimum) as long as they are within a certain percentage of each other - 10% I believe.

[awurth]

I recently did mine and got between 150-160 psi. but shoey is correct in saying that it is the percentage of difference that really matters. being a lower compression engine you will get a lower reading than what you might expect if you have come from the N/A world. I did notice though if your crank it more you get higher readings.

[Lunatic Dancer]

not an rb26 but i know that the sr20's are around the 150psi mark...

i know that if it is low and a bit of oil raises it its the piston rings, what

would cause a higher compression reading?

also i believe you are meant to crank the engine till the reading on gauge

stabalizes?

[Busky2k]

SR20 factory reading is 156psi to be precise You crank about 6-8 times.

But yeah another way to check if your rings are gone is to monitor your oil useage and to check spark plugs for fouling (usually a bad cylinder will do it).

Also sometimes with cars that use alot of oil or just are plain old have alot of carbon in their combustion chambers which can raise compression past factory specs.