Yes, the choke size is the main issue. The SU's don't really have the
equivalent of chokes other than the ramp for the jets. It wouldn't surprise
me if the Weber is running something like 34 chokes or smaller.
But the distribution is important, too. Effectively, the bore spacing with
twin SU's is much wider than the bore spacing of a single twin-choke carb,
so each bore can be more centered over a pair of cylinders.
> -----Original Message-----
> From: ambradley@frontiernet.net [mailto:ambradley@frontiernet.net]
> Sent: Saturday, August 21, 2004 3:51 PM
> To: Gordon Glasgow
> Cc: Datsun-Roadsters@Autox. Team. Net
> Subject: RE: Weber Questions
>
>
> Since a single 40DCOE is 2x40mm, and a dual SU setup is 2x38mm, how
> would the DCOE be too little? Is it because the chokes make it
> effectively smaller than 40mm? I'm confused, but then again that's
> easily done. :-)
>
> Quoting Gordon Glasgow <gsglasgow@comcast.net>:
>
> > Well, I admit I've never played with a setup like this, but I'd think
> > a
> > single 40DCOE is far too little carb for a 1600 (what choke is it
> > running?).
> > And the indication from the plug readings is that the Cannon manifold
> > isn't
> > doing a very good job of evenly distributing the fuel. If you could
> > find the
> > twin SU setup for the L-series, my bet is that it would work much
> > better.
> > Either that or pick another 40DCOE and the appropriate manifold and
> > run twin
> > 40s.
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