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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: Pinging and Backfiring!?
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Thu, 25 July 2002 05:19
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Webbers are fun in the way they like to backfire as they are pumping so much fuel through, now its hard to say exactly whats causing this problem but i'll try listing a few things you can have a look at,
first of all your timeing may be wrong, i know with my car if you adjust it to far one way you get pinging where to far the other way and you get it to backfire.
check ignition leads you may find one has very high resistence causing a late spark or no spark.
check you haven't already got the webbers set to rich as when you set a webber up for heaps of fuel for when you are at high revs they tend to pump to much fuel in at low revs which may not all be being burnt,
but you also may find that all your problems is caused by the compression. standard they should have 171psi the maximum difference between clyinders should be 14psi and and the minimum compression should be 142psi so in other words your engine needs major work done to it, don't thrash it which such low compression as you will just cause more damage, and a main thing that affects the combustion in the cylinder is compression if you have something with low compression you want it to have high octane fuel where if you have something with very high compression you want to use lower octane fuel so you don't blow it up. you can't tune your engine as you have such big compression differences what fuel and air mixture might be right for the front two cylinders wont be for the rear two.
in other words either get a new engine or fix it. and your problems should go away.
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