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posted on September 26th, 2012 at 08:45 PM
Hey guys,
I finally got around to slipping some 47.5 and then 55 Idle jets into my carbs, I would of preferred 50s but I’ll have to chase some down. The
47.5s were an improvement again on the smaller jets but still running lean when accelerating up to 60kmh, I then tried out the 55s acceleration was
great with the wideband sitting on about mid 13’s there was a slight dead spot around 3krpm but that’s not a concern atm. The only issue I have is
that at idle (was sitting a little low around 500rpm.. will fix) the A/F mixture was off the scale rich (below 10). Ill pop some 50’s in this
weekend and I expect this will help with the idle AF but should I be leaning out the mixture screws to balance out the rich idle? Also how low is too
low for A/F mixtures i.e when will plugs start to fowl?
Cheers AL
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matberry
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posted on September 26th, 2012 at 08:52 PM
The A/F is rich only because you haven't got the idle mixtures right. The idle jets govern the progression circuit, the mixture screws are at idle.
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DubCty
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posted on September 26th, 2012 at 09:07 PM
Thats what I thought, Ill see how the 50's feel and then work on the idle mixtures.
thanks Matberry your a great help.
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posted on October 1st, 2012 at 08:59 PM
At last I think the jets are right there is still a small dead/lean spot when accelerating but any richer and everything turns to S**T. I’ve set the
mixture screws so that idle sits at around 12.5A/F. The cold start is ok but getting the car to start when its warm (after sitting for a short period)
can take a while turning it over, are there any tips for improving warm starts?
