Rb25 Comp Test Values, Need A Second Opinion

[stagea_1998]

hi guys

im sure this has been covered countless times, but i got some funny reading and im just after a second opinion

Compression test values are as follows:

DRY TEST (no oil):

1 - 110 psi

2 - 105 psi

3 - 105 psi

4 - 100 psi

5 - 115 psi

6 - 100 psi

WET TEST (oil dropped in cylinder) :
1 - 120 psi

2 - 125 psi

3 - 105 psi
4 - 195 psi
5 - 150 psi

6 - 160 psi


the wet test threw me off about with how much variance there was, but as well as that it seemed quite low on the dry test
thanks in advance
cheers

[Ben C34]

Why did you test it? Any problems?

If not just drive it. People get caught up and just confuse themselves with comp tests.

[stagea_1998]

ohh i forgot to mention its my mates r33 im looking to buy
just wanted to do a check before i commit....as far as i know it runs pretty sweet

Edited March 4, 2015 by stagea_1998

[stagea_1998]

Why did you test it? Any problems?

If not just drive it. People get caught up and just confuse themselves with comp tests.

ohh i forgot to mention its my mates r33 im looking to buy

just wanted to do a check before i commit....as far as i know it runs pretty sweet

[Duncan]

if it runs well and doesn't blow smoke, don't worry about it.

btw does it have standard cams? the number are low but cams can affect that (and also the exact testing procedure of course(

[stagea_1998]

if it runs well and doesn't blow smoke, don't worry about it.

btw does it have standard cams? the number are low but cams can affect that (and also the exact testing procedure of course(

nah all standard internally theres just a few basic bolt ons

im pretty well inclined to say its fine but i always like to have a second opinion when im unsure

Edited March 4, 2015 by stagea_1998

[Sinista32]

Re The testing procedure - figures do not seem consistent (bad or good) - Dry V Wet variances. Readings on some are all over the place.

I'd have some one else who does this often re-test first. It's just too inconsistent.

Eg. cyl 4 has jumped 95psi

Variances

10

20

0

95

35

60

[Sinista32]

by chance If the figures are correct - do not buy

[stagea_1998]

thats what i thought ...its a massive jump!!

i did use a second tester to check as well after i saw that to confirm the reading and sure enough it was dead on

ive done plenty of comp tests over the years on cars me and my brothers have bought and with the same test procedure id get pretty consistent readings...so id say ive an idea what im doing lol

this ones thrown me though....

[Sinista32]

The old Rule of thumb was Greater than 10% walk away

[stagea_1998]

The old Rule of thumb was Greater than 10% walk away

thats what ive always been told, that being the rule im a little bit over 10%