Mark,
My experience with both those options is that the DCOE 40's (a pair of
them) will be much better than a single DCOE 40. It is mostly based on
the necessary routing of the intake ports. If you examine the structure
of a single DCOE and the intake ports on a Spitfire 8-port head, you
will see that they are drastically different and to mount a single DCOE,
you will have the outer two cylinders getting less fuel than the inner
two. Depending on how you tune it, you will either be running the
outers too rich or the inners too lean, neither of which leads to much
advantage in performance or reliability.
The twin DCOE manifolds do a much better job of balancing the fuel load.
Just my 2 cents worth.
Joe (C)
-----Original Message-----
From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On
Behalf Of Mark J Bradakis
Sent: Tuesday, July 08, 2003 1:05 PM
To: fot@autox.team.net
Subject: Spitfire carb swap?
So lately I've been running the Luella, the red racing spit [Whose photo
now adorns http://www.team.net/mjb instead of Junior ] in a few local
autocrosses. It is really a D Prepared car, but I'm running the 8"
wheels
I had on Killer in his Street Prepared days. And Luella also does road
race duty at IVR events.
Anyway, as per the DP rules, there are two 1.5" SU carbs on the motor at
the
moment. Last night I was thinking I might get a bit better top end out
at
Wendover with a single Weber DCOE 45, or maybe a pair of 40s. Any
evidence
to show one carb setup is better than the other?
You know, I suppose I could take three different sets of carbs out to
Wendover
along with an accellerometer, a small stack of manifold gaskets and come
up
with some real numbers myself....
mjb.
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