need someones help with this

Post by **0range_Kouki24O** » Thu Jul 23, 2009 5:43 pm

just wondering what a good compression would be on a 1jz. i went to jdm engine depot today to look at the motors. we did a compression test on 3 motors 1j's and they all had 260 across. shouldnt it be between 160-170??? thats pretty high for a turbo motor

Post by **WDRacing** » Sat Aug 01, 2009 4:07 am

I think the test was bad. 260 is WAY high for an FI motor.

Post by **0range_Kouki24O** » Sat Aug 01, 2009 4:23 am

WDRacing wrote:I think the test was bad. 260 is WAY high for an FI motor.

they did a wet compression test i forgot to mention that. they used atf not regular oil

Post by **WDRacing** » Sat Aug 01, 2009 4:30 am

Well when compression is concerned, adding fluid volume will change the results. So unless you know how much they added you're basically F'd. It's either good or bad...and adding fluid hides what could be bad rings...etc.

Post by **FAST-DATSUN** » Thu Oct 15, 2009 6:38 am

A wet test is only for testing for bad rings. A proper compression test should be done dry with all plugs removed and a good battery and starter, crank the engine for 5-7 rotations on each cylinder recording the compression on the first and last rotation.. then compare all of them they should be with in 10% of each other..

Post by **rsagen** » Fri Oct 16, 2009 12:53 pm

so it should be between 160-170?

Post by **OutToWinPAHC** » Sat Oct 17, 2009 5:44 am

rsagen wrote:so it should be between 160-170?

For a factory boosted engine that sounds like good numbers.

need someones help with this

need someones help with this

Re: need someones help with this (0range_Kouki24O)

Re: need someones help with this (WDRacing)

Re: need someones help with this (0range_Kouki24O)

Re: need someones help with this (WDRacing)

Re: need someones help with this (FAST-DATSUN)

Re: need someones help with this (rsagen)

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