[Spridgets] Why Does Engine Like to Run Rich?

[Doug Altman]

Timing is set at the first pointer - 5 degrees BTDC.  Also the vacuum advance
vacuum break on the distributor seems to have a good diaphram - it holds
pressure when I blow on it. 

________________________________
From: Glen
Byrns <grbyrns at ucdavis.edu>
To: Spridgets <spridgets at autox.team.net>
Sent:
Tuesday, May 26, 2009 11:05:12 AM
Subject: Re: [Spridgets] Why Does Engine
Like to Run Rich?

timing??



> Stock 948 with good rings, stock rebuilt H-1
1 1/8" SU's.  I've adjusted the
> carbs per the workshop manual, used
Colortune, and even Frank's trick of a
> standard 2 1/2 turns down (15 flats)
on the jet adjusting nuts several times
> over the past couple of years and
they all point to running a lot leaner than
> where the engine runs best.  The
engine starts, runs, and accelerates best at
> 25 flats down (over 4 turns) on
both carbs.  Right now it seems to accelerate
> best when the front carb is
even at 30 flats (5 turns) down.  I've tried rich
> needles but it runs for
crap with these.  Spark plugs are always black and
> sooty.  Why does it like
rich?
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