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Compression Test Results

axe s

By axe s,
in Engines & Forced Induction

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axe s Experienced

axe s

Posted
Posted

Well long story short,

My step father is putting an RB30E+T into his EH holden,

Long process, finally got it going, took it for a bit of a drive to set the boost controller...

Pulled up to check where the tyres were rubbing, and noticed a miss, took it back to the house... did all the normal checks, couldn't find anything...

Next day my step father checked it over and found milky oil on the dipstick and in the rocker covers,

Did a compression test 140psi on 1,2,4,5 and about 125 on the 3 and 6

Motor was rebuilt about 10 years ago and done bugger all K's since, was in another EH that was a weekender...

What's do u's reckons wrong?? we're in the process of removing the head as we're leaning toward head gasket...

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axe s Experienced

axe s

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Posted (edited)

by the sounds of it he would have... he's sending him an email at the moment,

it's was also blowing steam out the exhaust... that was our main reason for thinking gasket...

also radiator lost fluid and pressurized with gas...

inside exhaust was also wet...

Edited by axe s
Mattee Apprentice

Mattee

Posted
Posted

sounds like a head gasket to me. Also, I'm assuming the motor was originally from a VL, Holden in all there wisdom decided to get the heads for that motor made from there own supplier because it was "cheaper", and it was, in every sense of the word, hence VL's had a problem with the heads cracking when the engine was over heated :(

Jmaac Proficient

Jmaac

Posted
Posted

+1 for a headgasket. nissan sohc heads are fine, they do not crack because they're made of a 'cheaper' material-they're all made from the same standard grade, its its all about process, both before the casting is made and operating conditions after. Anyway as above, the heads would only warp/crack if the cooling system wasnt bled correctly (most people either still dont know they have to do this or still cant do it correctly (2 top bleeders))

Genuine Nissan headgaskets are the best to go by in my book, even Supercheap ones are up to the task. I wouldnt try lowering the compression... as far as I recall the rb30et compression ratio is already pretty low at 7.8:1. Skim the head, and gain some response unless you want to run huge boost.

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