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From: delbene@homxa.UUCP (K.DELBENE)
Newsgroups: net.auto.tech
Subject: Proper Needle Sizes for SU HS-4 Carbs. on Detoxed MGB et. al.
Message-ID: <1154@homxa.UUCP>
Date: Tue, 29-Oct-85 09:03:49 EST
Article-I.D.: homxa.1154
Posted: Tue Oct 29 09:03:49 1985
Date-Received: Wed, 30-Oct-85 06:43:06 EST
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 26

A year or so ago, I detoxed my '79 MGB, removing the catlytic
converter and Zenith carb in favor of dual SU HS-4s and  a 
stainless exaust system.  Not wanting to go overboard, I left then
valve train in tact.  Well, last night I got to wondering about
the carbs' applicability with the stock pollution-control-influenced
valve train.  The question I have is whether the size 6 needles that
I put in are perhaps a bit too rich for the valve timing in the later model
Bs. I thought perhaps I'd try a number 21 instead.
Has anyone had experience with this modification?  Any recommendation
on needle sizes.  

While you're thinking about that one, try this one on for size: 
Sometimes when I accelerate hard off the line, I get a sharp knock
from the passenger side rear.  I've checked the brakes and spring shackles,
but nothing seems amiss.  I've had the problem since I bought the car 2 years
ago, but never experienced it on any other B's I've owned.  Having 
just had the car repainted 6 months ago, I told them to check for any frame
cancer, but the prognosis came back negative.  Anyone ever experienced such
a problem?

Any help  is much appreciated.  

					Kurt D. Del Bene
					Bell Labs - WB
					...!ihnp4!homxa!delbene