Jump to content
SAU Community

Recommended Posts

Just did compressions on my r33 and got these rather low figures

1 - 105

2 - 108

3 - 105

4 - 97

5 - 110

6 - 106

Tried cylinder 1 again with some oil and got near 200psi, does this indicate my rings are worn to the $hit house ? it uses a bit of oil here and there aswell

Edited by Slattery Gts-t
Link to comment
https://www.sau.com.au/forums/topic/380541-low-compressions/
Share on other sites

  • Replies 58
  • Created
  • Last Reply

Top Posters In This Topic

Yeah its the lowest iv ever seen across the board in the few iv tested

How much is involved in changing the engine in an r33? taking into account i have acess to a hoist, full toolkit and a few extra hands

I think the gauge is pretty accurate because our compressor reg is set to 100psi and when i sealed the air gun to the gauge and shot 100psi threw it the gauge went straight to 100psi

Im pretty confident my engine is shagged lucky it still runs alright, my odo shows 117,000 im taking it that this is wrong or is it not unusual for this to happen to these engines at these kms?

Haha oh well that gives me hope that it will last until i organise another engine, Only had this car a few weeks and from the start iv always thought it was lacking power especially off boost well this explains it

My engine had 140,000kms on it and 50,000 of that was at 300rwkw.

Compression test came up at 160psi across all 6. It only had a 2psi variance.

Seems that car has had the shit flogged out of it. Surprised it hasn't blown number 6 yet.

  • 2 months later...

Just thought id update

I was nearing the end of a 300km trip on saturday when all of a sudden there was a loud 'clunk' followed by lots of quieter "clunks"

First i though it must be bottom end related as this was unhealthy to start with but turns out my timing belt jumped a tooth on the intake cam and mashed a few valves

It only jumped one tooth though is this usually enough to smash valves ? now compression figures are around the 50psi mark with cylinder 4 showing absolutely nothing

Im replacing the whole engine it just didnt get here in time before this one shit itself

But your right because i plan to rebuild this engine and now i may have damaged the head

Lance: thats what i thought too so its got me buggered, im certain it was spot on before it happened

This is why you refresh a buggered engine - only costs a lot more when you have to start repairing damage. Especially bent valves.

yer damn that low compression putting all that extra strain on the timing belt.....:stupid:

1 tooth isnt anywhere near enough to mash valves, are you sure its only 1 tooth?

what about if the car has some aftermarket cams? wouldnt that make the compression drop , my first car had the cam reground and the compression fell from 150psi to 110psi,

that would explain it having fairly low km's and down on compression...:ph34r:

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Hi, We've all posted some thread, or know of some other person's thread, that contains information that we want to send people who are asking question to. But if we don't have a link readily available, have to go do a search for the thread before being able to do so. So, it occurred to me that we could possibly utilise the auto-text-replace function that fixes some of my swear words to perhaps auto replace some special keywords with text that also has a link to the thread. A specific example. The thread that I did with the improved R32 GTR wiring diagram scans. If the phrase "R32 GTR wiring diagram" could be auto replaced with "R32 GTR wiring diagram" then all I (or @Duncan, or any of the others that refer to the thread) need to do is remember that that's the keyword (or phrase in this case). OK, it would be better if this keyphrase wasn't that long, but it does need to be specific enough that it doesn't get triggered automatically. And obviously there are threads on turbo topics, or suspension topics that we could treat similarly. Alternatively (and/or additionally), I've been thinking about trying to build a library of the real expert content that is trapped in the bowels of the 25odd years of this site. Things like some of SydneyKid's content. There are threads that he started that should be more easily found, and he has individual posts, or series of posts, in other people's threads, containing very good information. Some of us know that it is there, but....just have no memory of exactly where/when/how we saw it. If we had some sort of library thread, we could put posts in there containing links to things we've found, suggestions for how to categorise it, then a mod or other appointed thread maintainer can copy the link and any key text up into the first post in the library thread. There are probably many other ways to get it done. Some sort of wiki is probably the best way.   Thoughts?
    • But, probably that happened to the last person too, which is why the RTV was there.....if you aren't putting a new gasket in you will need to seal the old gasket back to the metal surface with something, the gaskets will generally only work properly for a single use as they set/harden in that shape
    • What is with the horrible blue and white bit in the centre of the wheels, didn't that come off with some scrubbing?
    • Not sure how broadly you define Northside  but Castle Hill Exhaust are still around and could sort it.
    • I haven't done this as I still use the factory cluster, but I do know the circuits for the flash vs on for hi beam are separate which is likely the issue. The ON runs full power through the switch and the flash uses the relay in the engine bay. I'd hit the wiring diagram per GTSBoy's suggestion
×
×
  • Create New...