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Location:
Montrose, VIC
Registered:
May 2002
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Re: Pinging and Backfiring!?
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Thu, 25 July 2002 05:14
 
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Well, to begin with, any 18r with webbers and cams is never going to idle like a Lexus! But with that kind of variation in compression (120psi aint exactly brilliant anyway, 60 is well below lawnmower class...) shows theres something wrong with your engine. It could well be that theres something up with your valves/head somewhere, upsetting the vacuum to all hell. My suggestion would be to find out whats wrong with your engine, might be time for a rebuild or head reconditioning. Once you've got that sorted, then check out the ignition (what dizzy are you using? does it need a regraph to suit your cams/carbs?) and try to get the thing on a dyno to get the carbs straightened out. Another suggestion would be to avoid running it on regular unleaded, personally I think that older engines seem to run like utter crap on it at any time.
Have you tried a vacuum gauge on it? But yeah, with that kind of compression it's never going to run at all well anyway.
Good luck!
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