Compression Test Rb26

[jtur32]

what is the normal psi for a compression test on a rb 26 also what is the normal oil pressure

Edited December 11, 2005 by jtur32

[ferni]

as long as the pressures are even accross all cyls you should be right... i've seen them around 140psi give or take 20...

healthy oil pressure would be between 3-4, but it will move depending on revs etc..

You'd be better of telling us what you think is wrong, what your symptoms are if you have something wrong.

[GTRsean]

new 171

avg 160

limit 128

max difference between cylinders 14 psi

[jtur32]

  ferni said:

as long as the pressures are even accross all cyls you should be right... i've seen them around 140psi give or take 20...

healthy oil pressure would be between 3-4, but it will move depending on revs etc..

You'd be better of telling us what you think is wrong, what your symptoms are if you have something wrong.

<{POST_SNAPBACK}>

i dont think anything is wrong i just bought it did a compression test no1-150psi no2-155 psi no3-155psi no4-155psi no5 155psi no6-155psi i put a couple of drips of oil in the cylinder no1 and it went up 5psi is that bad? it is meant to have slightly bigger cams in it oil pressure is about 2 at 1000rpm and goes up to 4 at about 3500rpm-4000rpm

[jtur32]

  GTRsean said:

new 171

avg 160

limit 128

max difference between cylinders 14 psi

<{POST_SNAPBACK}>

thanks if it has slightly bigger cams do the readings so lower psi

[The Dan]

  jtur32 said:

i dont think anything is wrong i just bought it did a compression test no1-150psi no2-155 psi no3-155psi no4-155psi no5 155psi no6-155psi i put a couple of drips of oil in the cylinder no1 and it went up 5psi is that bad? it is meant to have slightly bigger cams in it oil pressure is about 2 at 1000rpm and goes up to 4 at about 3500rpm-4000rpm

<{POST_SNAPBACK}>

This is normal. But did you do the compression test with the engine warm and WOT.

[GTRsean]

"thanks if it has slightly bigger cams do the readings so lower psi"

Usually no by much at all. As long as you do the test with WOT and a warm engine.

I usually take all of the plugs out when I do the test.

[jtur32]

  3lit3 32 said:

This is normal. But did you do the compression test with the engine warm and WOT.

<{POST_SNAPBACK}>

yes i did normal operating temp

[SLY33]

i have done tests with closed and WOT and found the same results, whats the difference supposed to be?!

[GTRsean]

air fills cylinders easier cos the throttle isnt blocking airflow so much when it's open. Service manual says so....