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Re: Need Weber tuning suggestions

To: "Matthew Wilder" <mwilder@top.monad.net>, <fot@autox.team.net>
Subject: Re: Need Weber tuning suggestions
From: carco@t-online.de (Carsten Conrads)
Date: Mon, 05 Jun 2000 18:36:46 +0200
The best are 45 DCOE, but 40 DCOE runs it also.

With the 40 Weber take follow parts for a good driving mark:

emulsion tube F2 (if not available take a F16)
choke 32 (for more power in the top range take 34)
air correct jet 180
main jet  130 - 140
pump jet 40
idle jet 50F8

With the "D" cam this made approx. really 120 - 125 hp.

If you take a 45 Weber add. approx. 8 hp, with the same engine
modifications.

But you need a higher compression fuel pump!

see also:  http://home.t-online.de/home/carco/home.htm


Carsten Conrads


baxter culver wrote:
> 
> What choke size did Moss supply.  You probably want a 36, or 38 choke.
> Smaller gives you better grunt off the line--limits upper rpm.  Bigger the
> reverse.  The choke determines the velocity of the air column.  I would then
> try a fatter main jet.  somewhere in the 150-160 range with an air corrector
> at 180-190 range.   Your idle jet is probably ok.   At 3500 rpm you are out
> of the idle circuit.  The emulsion tube likewise although I always had good
> luck with a F15.   If you can find one, Haynes had a Weber manual (Haynes
> #393)  which is excellant.  Has a good tuning section for the DCOE's.
> Finally, there are sufficient variables in the jetting, emulsions, choke and
> air correction to drive you nuts.   However, if you get really good at it
> (and invest a small fortune in spares) you can keep the engine at maximum hp
> by altering the jetting to compensate for air density and temp/humidity.
> That's what the racers did before black boxes and electronic fuel/ignition
> stuff appeared.  There was always one of the crew who could delve into the
> mysteries of Weber and make them sing.  Good luck.
> ----- Original Message -----
> From: Matthew Wilder <mwilder@top.monad.net>
> To: <fot@autox.team.net>
> Sent: Sunday, June 04, 2000 6:02 PM
> Subject: Need Weber tuning suggestions
> 
> > Hello,
> >   I ditched my SU's in favor of a set of 40 DCOE's from Moss. I got them
> > Friday took them out of the box and put them on the car and ran it today
> > in an auto-x.  They seemed to work great up to about 3500 rpm then it
> > just ran out of go and wouldn't make it over 5000 rpm.  I'm running
> > about 11.5 compresion with some head mods and a "D" cam.  The settings
> > Moss suplied are:
> > Air corrector jet  180
> > Emulsion tube      F 11
> > Main Jet           130
> > Idling Jet         45 F9
> > Pump Jet           40
> > I also didn't do anything with the float level yet.
> >
> > Any suggestions on what setting to use to wake this thing up?
> >
> > Matt W.
> > '67 TR4a  E-prepared Solo 2/auto-x

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