[Spridgets] Why Does Engine Like to Run Rich?

[Doug Altman]

Plugs are black even on long runs.  Also, floats have been set using a 7/16"
bar as per instructions.  I have had trouble in the past with float seats that
leak but I have had them fixed for awhile now, I believe.  If the floats were
sticking or mal adjusted to give me too much fuel, you would think the engine
would want the carbs set leaner, right?  I just don't want the jet adjusting
nuts to come off the end - they're close.  Also I burn a lot of gas.
________________________________
From: David Lieb <72spridget at gmail.com>
To:
Doug Altman <doug_altman at yahoo.com>
Sent: Tuesday, May 26, 2009 10:50:50 AM
Subject: Re: [Spridgets] Why Does Engine Like to Run Rich?

Is it possible
that the floats are set too high? The fuel level in the
float chamber WILL
affect your mixture. Obviously, the higher the
fuel, the more will get sucked
in at a given vaccum level in the
venturi.
david Lieb


On Tue, May 26, 2009
at 9:17 AM, Doug Altman <doug_altman at yahoo.com> wrote:
> 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?
>
_______________________________________________
> Support Team.Net
 http://www.team.net/donate.html
>
> You are subscribed as
72spridget at gmail.com
>
> http://www.team.net/archive
>
>
http://autox.team.net/mailman/listinfo/spridgets