Jump to content
SAU Community

Recommended Posts

Hey guys got my compression test results on my Rb26DETT as follows.

176 180 177 155 150 170

There is a diff of 30 between cyl 2 and 5 :S Is it worth throwing on some aftermarket turbo's and power fc etc or does it look like rebuild time?

How long do you guys think the engine might last? Seems to run fine? Thanks!

Link to comment
https://www.sau.com.au/forums/topic/187549-compression-test-results/
Share on other sites

Hey guys got my compression test results on my Rb26DETT as follows.

176 180 177 155 150 170

There is a diff of 30 between cyl 2 and 5 :S Is it worth throwing on some aftermarket turbo's and power fc etc or does it look like rebuild time?

How long do you guys think the engine might last? Seems to run fine?

Should i get a leakdown test done next? Thanks!

I wouldn't break out the cheque book just yet guys. there are a couple of things that can give incorrect results. I would be happy with 150 in all 6 cylinders as long as it's even. how was the test done? hot? how much time cranking? what type/brand of gauge? how good is the battery? throttle open?

i wasn't there when the test was done but it was done by a reputable performance shop. I'm getting another compression test and leakdown done on tuesday so when i have the results ill post them up! I doubt the engine could be that bad.. the car is standard and runs very well! nice and smooth good pickup and idles perfect

I have done compression test on my rb25 and the numbers were 180psi,190psi,180psi,180psi,180psi,190psi, I was surprise with the #, then I went to check the fsm and the fsm says factory is 185 maximum and 150psi is minimum for the motor to be good and a difference (I don't remeber exactly right now) but I think was 15psi between them, so I was really surprised and I've checked to see if I had a rb25de turned to rb25det and my motor is for sure a rb25det not tuned to be a (t) so I went to check my cams and apparently they have been changed (new gasket all around the valve covers,I have to open to see what cams do I have still), so I think the best you to do is, do the compression again this time make sure if you have the battery fully charged no spark no fuel and wide open throttle, turn the ignition for about 5 to 7 seconds and make sure your tester is ok too.

This is what I have done, I'm not 100% sure about rb26 but that is what the fsm says to do for my rb25det.

I hope your motor is ok man!

gl!

Lower comp on 4 and 5 could even be a head gasket . Test again and do a leakdown to pinpoint the comp loss on 4+5.

Is it a re-built engine or stock? Dont forget carbon built up will increase compression.

Hey guys well I am happy to report apparently my engine is fine. Wen't and had another compression test done at a very reputable place and also hot and cold leakdown tests done. Compression was 150 on all 6 cyl and on the leakdown just said "nothin to worry about all less than 10%"

I dunno why it came up with dodgy readings the first time but i'm happy with that result!

Cheers

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

    • I mean, I got two VASS engineers to refuse to cert my own coilovers stating those very laws. Appendix B makes it pretty clear what it considers 'Variable Suspension' to be. In my lived experience they can't certify something that isn't actually in the list as something that requires certification. In the VASS engineering checklist they have to complete (LS3/NCOP11) and sign on there is nothing there. All the references inside NCOP11 state that if it's variable by the driver that height needs to maintain 100mm while the car is in motion. It states the car is lowered lowering blocks and other types of things are acceptable. Dialling out a shock is about as 'user adjustable' as changing any other suspension component lol. I wanted to have it signed off to dissuade HWP and RWC testers to state the suspension is legal to avoid having this discussion with them. The real problem is that Police and RWC/Pink/Blue slip people will say it needs engineering, and the engineers will state it doesn't need engineering. It is hugely irritating when aforementioned people get all "i know the rules mate feck off" when they don't, and the actual engineers are pleasant as all hell and do know the rules. Cars failing RWC for things that aren't listed in the RWC requirements is another thing here entirely!
    • I don't. I mean, mine's not a GTR, but it is a 32 with a lot of GTR stuff on it. But regardless, I typically buy from local suppliers. Getting stuff from Japan is seldom worth the pain. Buying from RHDJapan usually ends up in the final total of your basket being about double what you thought it would be, after all the bullshit fees and such are added on.
    • The hydrocarbon component of E10 can be shittier, and is in fact, shittier, than that used in normal 91RON fuel. That's because the octane boost provided by the ethanol allows them to use stuff that doesn't make the grade without the help. The 1c/L saving typically available on E10 is going to be massively overridden by the increased consumption caused by the ethanol and the crappier HC (ie the HCs will be less dense, meaning that there will definitely be less energy per unit volume than for more dense HCs). That is one of the reasons why P98 will return better fuel consumption than 91 does, even with the ignition timing completely fixed. There is more energy per unit volume because the HCs used in 98 are higher density than in the lawnmower fuel.
    • No, I'd suggest that that is the checklist for pneumatic/hydraulic adjustable systems. I would say, based on my years of reading and complying with Australian Standards and similar regulations, that the narrow interpretation of Clause 3.2 b would be the preferred/expected/intended one, by the author, and those using the standard. Wishful thinking need not apply.
    • Yes they do. For some maybe. But for those used the most by abusers, ie Skylines, the numbers are known. The stock eyebrow height for R32/3 Skylines is about 365/375mm or thereabouts. The minimum such heights are recorded in adjacent columns in the database.
×
×
  • Create New...