rb30 compression
Submitted: Wednesday, Mar 05, 2008 at 19:25
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Kev C
My 93 3l Patrol is playing up & I was suspecting a leaking valve problem, however on doing some dry & wet compression testing I encountered some unexpected results:
DRY
1 2 3 4 5 6
145 170 175 165 180 170
WET
1 2 3 4 5 6
170 185 200 180 185 185
This seems to suggest worn rings in cylinder 1.
Can anyone tell me what the compression should be in an RB30 carbi motor? I would also appreciate any other suggestions. This motor misses & sometimes stalls, uses fuel & lacks power. I have replaced all leads, plugs, rotor & dizzi cap and also tried various timings. This is a dual fuel car but it runs even worse on gas.
Reply By: Robin Miller - Wednesday, Mar 05, 2008 at 19:44
Wednesday, Mar 05, 2008 at 19:44
1196 kpA kev , with 98kpa variation between cylinders
multiply by 0.145 if you wish psi
Your figures don't indicate miss problems - but I would
check the fuel pre-heating block between manifold and carbie, particularly if it has cold starting issues, as they often collapse break up and leave bits blocking inlet tract.
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