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Re: Weber DCOE tuning

To: MICHAEL CARPENTER <MAIL4CARPENTERS@peoplepc.com>, spridgets@autox.team.net
Subject: Re: Weber DCOE tuning
Date: Sun, 06 Nov 2005 16:01:06 GMT jA6G2SoK002187
Mike....

The standard Weber kit for the stock 1275
is a 45DCOE however....

below are the given calibrated settings for
a Series A 1275 engine running a 40DCOE
with "modified head" (out of Vizard):

chokes (main venturis) 35mm
aux. venturies                4.5
Main jets                        145
Air correctors                180
Emulsion tubes              F16
Pump jet                         45
Idle     "                           50F2

Assuming you are running a stock 1275
with stock head, the foregoing would be a
little more than you need, considering
the increased flow capacity of a "modified"
head (ported, bigger intake valves, etc.).

You could probably get away with slightly
smaller chokes for better flow "velocity"
(initial and low end response) and better all-around driveability at the rpm's 
normally used in a stock application on a daily basis, along with something like
135 mains with 175 air correctors.

But at least the foregoing Vizard settings
are "reasonable" ballpark to begin with
and a Haynes Weber Manual may be able
to offer you other jetting choices as well
for your application.

There's a difference between "getting it to run"......and it "running well", 
especially when it comes to decent performance with
reasonable all around economy of operation!! :)




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