Exactly. The vacuum signal is "routed" to the idle ports only when the
throttles are closed. Try going to the original chokes, see if anything is
blocked by the new chokes (unlikely, but...), try leaner idle jets, but if
the air screws work at all, then they are probably close enough, do the
normal stuff like blowing out the jets and drill-ways for crud (some of the
drill ways and jet orifices are pretty damn small in the idle section.
Then, do an experiment with the timing. Try swinging the timing to see if
a different idle timing setting can make it idle well. If so, then you can
modify the centrifugal timing mechanism to add or reduce the low speed
timing relative to the maximum timing that is what you worry about above
4000 rpm. You probably want a lot more advance at low speeds. My last
motor (one of the Martin's) idled fantastic - it had a distributor that was
locked at 44 degrees BTDC...
FWIW, my new 1600 ford race motor will not idle below 2000 rpm, no way no
how. If I try for a 1200 - 1500 rpm idle it loads up and dies. My
solution is to idle it at 2000 rpm...:)
Brian
At 02:41 AM 6/7/01 -0400, Steve Schaeffer wrote:
>At idle, how would the engine know what chokes it has? The throttles are
>closed.
>
>After it dies, what do the plugs look like? Too rich?
>
>Steve S.
>
>
>
>----- Original Message -----
>From: <RodsINTOMG@aol.com>
>To: <rccook16@voyager.net>; <vintage-race@autox.team.net>
>Sent: Wednesday, June 06, 2001 10:43 PM
>Subject: Re: Weber question, Sprite cam
>
>
> > In a message dated 6/6/01 7:50:32 PM Pacific Daylight Time,
> > rccook16@voyager.net writes:
> >
> > << Acts like it's flooding but what would cause this by changing to
> > bigger chokes? >>
> >
> > I'm no expert but it sounds like with the bigger chokes your engine can't
> > provide the necessary vaccum signal to the carb to pull the fuel from the
> > idle port and that you have to run the idle speed faster so that you
>running
> > on the off idle port. Let the flames begin.
> >
> > Rod Schweiger
Brian Evans
Director, Canada
MCI Wholesale Internet Services
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