Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83 based; site homxa.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!homxa!delbene 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