Quick Question

[agentx]

Guys i would really REALLY appreciate some help in this matter ... i've just put a deposit down on a skyline r32 (RB20DET) (i shouldve waited till after) he did a compression check on it today and the results are as follows:

1) 90

2) 95

3) 90

4) 90

5) 100

6) 95

They are pretty even, but i read around a bit and saw that it should be around the 150 mark? the car drives perfect and theres no smoke revving it up. Now what i'm thinking is that the compression check was done wrong? or are there different types of checks which u get different results with?

Please tell me what i should do as 10k is alot of cash for me. Should i get a leakdown test done on it again from a performance mechanic? What are the perfect results for that going to be like?

Thanks for the help guys!

[zebra]

Leak Down Test for sure

2 or 3% is really good

[agentx]

yea i'll get one done.

and usually if theres compression loss .. its really obvious in one or two cylinders yea? not even all around 6?

[tridentt150v]

Who actually did the test? if it's not done correctly you can get sh1t results. ie car should be warm

If results are still the same, squirt a bit of heavy oil down one of the cylinders and try again, if results are better then its rings, if results are still poor its valves and guides [and probably rings as well].

[The Mafia]

thats sounds alright, I had a tester that was reading a heap low too, was probably faulty

[R33Turbo]

Yeah i doubt all 6 cylinder rings will be worn out, but my compression on Neo engine was all 150 mark, maybe rb20's are different cuz i read some other 32 reading real low around 100 as well. And also i know a mate who has a cylinder difference of 50psi from others and with a oil squirt it gets 170, which im assuming is the rings or the pistons itself however it runs perfectly fine and has great power on dyno without any loss so im confused to whether you should feel any performance loss or not lol

[agentx]

from what i've read in the previous posts on this forum ... rb20's should have around the 150 mark? anyone know?

[paulr33]

yeah 150 sounds about right across the board as an average

sounds like the results are bogus