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Re: Carburetion

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Subject: Re: Carburetion
From: "Eric J Russell" <>
Date: Wed, 30 Aug 2006 16:06:49 -0400
I do not know why SU's get such a bad reputation. Possibly because 
they don't *look* like an American carburetor?

The SU type carb is essentially the same as the CD (Constant 
Depression) type carbs used on most (high performance) motorcycles 
until *very* recently (when emissions regulations have forced 
manufacturers to EFI). They are really very good carbs.

I have a set of SU HS4's on our 1978 MGB. Once properly set up & 
adjusted they are not finicky. And they are not difficult to set up & 
adjust - just different!

Eric Russell
STOC #2860
Mebane, NC

----- Original Message ----- 
> Date: Wed, 30 Aug 2006 13:52:42 -0600
> From: "Scott Bonacker" <>
> Subject: Carburetion
> I've been planning for a carburetor upgrade on my '77 B car from the
> original single ZS, looking at the information available on the 
> internet and
> finally bought the book on power tuning.
> The downdraft Weber was looking pretty attractive because of what I 
> have
> read about the need to maintain and occasionally rebuild the SU's, 
> but the
> power tuning book doesn't even mention the downdraft Weber, and only
> mentions the sidedrafts in the context of racing.
> There may be a compare and contact between Su and Weber carburetors 
> that I
> haven't seen, so any suggestions and/or links would be appreciated.
> Thanks,
> Scott Bonacker
> 1977RBB

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