Compression Test Results

[SilverECR33]

AS the topic states.

Anyone who did a comp test on their stock R33 before they modded it post it up.

I did mine recently before I threw on some mods. all mine had was the HKS from the turbo back with SuperDragger Exhaust. running stock boost etc. etc.

I got 175-175-175-175-175-175 all pots , I was definently pleased with that they were nice and even.

When I was chatting with a GTR owner recently he seemed to think that was incorrect. Or that my internals are not stock for that compression test.

So went back to my mates shop did another same result. Now he uses top quality snap-on equipment so I'm sure all the readings are correct.

Just wanted to do a Comparison to anyone elses results.

[WogsRus]

I have 150 psi dead across all cylinders, still well within norm.

[GTRsean]

Mine got 175 with the throttle wide open, 160 with throttle closed r32GTR

8.5:1 compression RB26DETT

9.2:1 or something on RB25DET

So either you did test with throttle closed or you have a lower static comp ratio?

[WogsRus]

who are you talking about. ME. i did it with throttle closed i think. Humm will do again tonight. But the range is 1.2 MPa which is 175pis, that is NEW from facotry. Limmit is 0.9 MPa, so that is 130 Psi with 0.1 MPa differance between. So still sweet. My engine has done 80K so expect lower compresion.

BTW mine is for an R33 GTST 95 series

[GTRsean]

I was talking about Dale's car.

Uaually 10-15 psi difference throttle open, and throttle closed.

[SS8_Gohan]

can any car workshop/garage do one of these? is it cheap? i wouldn't mind just getting one done to see my engine is like.

is it a very good indication of how healthy an engine is?

[GTRsean]

If you want a proper check, get the workshop to do a leak down check.

It'll tell you more about condition of engine than a normal comp test.

[SilverECR33]

Thanks for the heads up GTRsean. Not sure if it was open or closed. all i know was car was off

ill be doin another very soon, keen to check out if theres been any change since ive been driving around on 11psi for 2 months.

-cheers.

[(B1) MR_fanny]

i got 160 all round...done by a workshop for 70bucks. clean unboosted engine with 120k. i was very pleased.

[vidospace]

140-150-80-150-150

I am really upset :-(

[SS8_Gohan]

^ would that be ok if the 80 was say a 140? or are those #'s still too low?

[Race_Bred]

140-150-80-150-150

I am really upset :-(

what about number 6? or has that one left the building?

The numbers are ok but the 80 is too low

[GTRsean]

Videospace, were they done with throttle open?

And did oil get put in cyl to see if it was piston, rings etc?

32gtr rb26dett limits from memory are:

171 new

160 avg

125 limit

no more than 14psi variance,(146,160)

[colbs]

videospace: is there any noticable difference in the engine or noise etc

[vidospace]

Yep. Idle is crap. When it is cold it misses a lot. When it is warm its very hard to tell there is anything wrong. The idle is still not brilliant when it is warm but otherwise the power is OK and everything else.

Bryce

[vidospace]

And yes the 6th cylinder was 150 too (sorry guys).

And yes we did try a "wet test" with a t-spoon of oil and the compression improved. Rings it is. Rebuild away! I am considering a swap with a R33 RB26.

[markimak]

140-150-80-150-150

I am really upset :-(

i would be too ur only quoting 5 cylinders!!

[markimak]

And yes the 6th cylinder was 150 too (sorry guys).

And yes we did try a "wet test" with a t-spoon of oil and the compression improved. Rings it is. Rebuild away! I am considering a swap with a R33 RB26.

haha see it now lol

[SS8_Gohan]

so this test is around $70 and most car garages can do it? or do you need to go to a special place? Keen to see how my engine is doing. Might do one of those leak down tests too, someone mentioned above.

oh well vidospace, now you can build whatever engine you want.

N1 block ftw!!

[Ska]

My Compression Test Results (18/12/2006)

1 - 138

2 - 148

3 - 137

4 - 138

5 - 136

6 - 138