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Wanting To Comp. Test Out My New Rb26 Motor.

nsta

By nsta,
in Engines & Forced Induction

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nsta Mentor

nsta

Posted
Posted

Hey guys, im wanting to know whats a good reading for a compression test on an rb26 engine, i just got a new motor put in, and would like to make sure its going to be healthy for me.

Basically the guy i bought it off advised me the readings he got before giving the motor to me were:

165.7

165.8

167.3

170.2

165.1

165.4

Is this a healthy motor?, and i want to do a leakdown just to make sure....

How much will it cost to get a compression test done, and wet/dry leakdown test???

Thanks.

The Mafia Grand Master

The Mafia

Posted
Posted

thats pretty good, maybe even a little bit high for a RB26.

My RB25 was 165psi across all 6, and its compression ratio is 9:1.

THe RB26 comp ratio is lower so you would expect lower compression test results.

As long as they are all equal or within 5% mate.

rob82 Mentor

rob82

Posted
Posted
thats pretty good, maybe even a little bit high for a RB26.

My RB25 was 165psi across all 6, and its compression ratio is 9:1.

THe RB26 comp ratio is lower so you would expect lower compression test results.

As long as they are all equal or within 5% mate.

Cranking compression has alot more variables than just compression ratio.

N1GTR Grand Master

N1GTR

Posted
Posted
165.7

165.8

167.3

170.2

165.1

165.4

OMG! Nah mate thats terrible, its going to let go soon - take it back and say you changed your mind

Im kidding, do a search on comp tests and you will see those numbers are fine. Now go get the keys, take it to a track, and make it earn its keep!

rob82 Mentor

rob82

Posted
Posted (edited)

Personally I like the mathematical precision at which the tests were performed. 165.7 on cylinder 1 are you sure it wasn't 165.732 psi?

I'd be doing my own test as those firgures sound like he's pulled them out of his arse.

Edited by rob82

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