Opinions wanted ( analysis of the effects of spark advance va riation on vacuum)

[Reid Bishop]

Although this may be somewhat true (especially for weber carbs), it
generally leads to lean misfires, which cause hydrocarbons to rocket skyward
and will certainly cause a 'Fail' during emissions inspections.  I fought
this issue with a 260Z that I had a few years ago, as well as my 2.5 carb'd
Jeep before dropping in the 4.3 Bowtie.

-----Original Message-----
From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf Of
James Northrup
Sent: Friday, September 21, 2001 6:32 PM
To: gmecm at diy-efi.org
Subject: RE: Opinions wanted ( analysis of the effects of spark advance va
riation on vacuum)

during my trials and tribulations with a leaky weber carb during my youth i
came across a race-performance tuning manual that had an interesting
tidbit.. (interesting to me, though I was uninterested in economy)
basically it stated you will do well to run your idle jets as lean as
mechanically possible and still keep an idle.  (less idle fuel is somehow
less cost, whatever the fraction)

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