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Compression Help!

evoeta

By evoeta,
in Engines & Forced Induction

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evoeta Apprentice

evoeta

Posted
Posted

Hey guys, this is the first rb30det ive tridd to build. Its a fairly basic one. Stock bottom end with acl bearings, standard rb30 rods and pistons which are in good order. Arp head studs. 1.3mm headgasket. and rb25det head which had been cleaned up etc. Went to to compressio test. It had no extractors, intake on and no spark plugs in any of the cylinders prstty bare and im getting about 100psi all over roughly. B

Just did the test with battery on starter motor etc any help much appreciated!!

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KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Sounds like my engine. Unless you're going to pull it apart and put in some high compression pistons you may as well carry on and test it again when its been run. Thinner headgasket would help but will not make a significant difference. My compressions are all around 120 and I am making 314AWKW with a 3540R. PM me your no and I'll give you a ring if you want.

Duncan Grand Master

Duncan

Posted
Posted

absolutely don't worry about the compression until the rings are bedded in. and for what it's worth the motor should be warm too, as well as a healthy battery (which they normally aren't by the time a motor's been pulled out, rebuilt, and put back in)

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