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Re: DCOE carb jetting

To: mgs@autox.team.net
Subject: Re: DCOE carb jetting
From: matttrebelhorn@netscape.net (Matthew Trebelhorn)
Date: Wed, 21 Aug 2002 16:31:57 -0400
WSpohn4@aol.com wrote:

>In a message dated 21/08/02 10:32:32 AM Pacific Daylight Time, 
>
>> We recently became the owner of a pair of new 45DCOE 
>> carbs to use on our BMW 1600-2 rally car.  
>
> How would YOU jet these carbs to 
>> optimize performance in the 4k to 5.5k rpm range on this or
>> your MG engine?  
>
>This is a totally meaningless question and anyone that tries to answer it 
>will be offering information with zero value.

>First, go buy a Weber book and find out what the settings for a BMW engine of 
>your state of tune might be (you don't bother offering cam information). That 
>is only a very basic guide to what size venturis and what other settings you 
>may want to try. Then have an expert do the tuning. 
>
>Please believe me - if you have no specialised knowledge, Webers are NOT the 
>carbs to start trying to tune by guess, and by misinformation.
>
>Bill
>(10 Webers currently in use)


I love this list, and the diversity of its members, and all of the experience 
and thought that is here accumulated.  And I love having people as intelligent 
as Bill with whom to disagree.

Actually, I'll only partially disagree.  Rick, by all means, buy a book or two 
on Webers.  But here's the disagreement part: if a reasonably intelligent 
person devotes a little time to studying them, there's no reason they can't 
achieve a quite satisfactory result with Webers.  And, since Rick is talking 
about building a rally motor, he probably wants mid-range torque, and 
smoothness, as opposed to all-out maximum power at redline.

Though maybe I'm too much a weber guy already if I'm calling 5k mid-range; but 
I digress.

Webers aren't rocket science or brain surgery, but I'd wager that there are 
members here capable of comprehending (and probably practicing) those 
disciplines as well.

My recommendations:
1. Buy a book
2. Get either 28mm (smallest available) or 30mm chokes for your webers.  This 
is the most important step in making the engine do what you want it to.

-Matt (only 4 webers at the moment)


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