delbene@mhuxo.UUCP (DELBENE) (12/09/85)
I think I've finally had it! I spent 8+ hours this weekend tuning and retuning the dual SU HS-4 carbs on my '79 MGB and still am not satisfied. I think I've got the tune up procedure down, as I've been doing it for several years (and several MGs) now. I'm relatively certain that I've got excess clearence at the throttle bushings, causing a variable air leak, and hence a variable mixture. My past experiences with having these carbs rebushed have been less than favorable, since the operation requires a level of precision difficult to come by in most machine shops. In addition, I have the old technology straight needles, which are a pain in the posterior to center in the jet. As a result, I think I want new carbs. Hence, my question: Anyone have any thoughts on swapping out my SUs for a 32/36 progressive downdraft Weber rather than purchasing two new SUs? The cost of the Weber with manifold via Moss Motors is $250, versus approx. $130 for two SUs, direct from the U.K. As I see it, the extra $120 is buying me 10-20 years of technological improvement, but not being experienced in Webers, I'm not sure what that is. As my MGB is intended to run a single (and completely inadequate) Stromberg Zenith carb rather than the dual SUs, I'm also hoping the Weber will be more adjustable to my partially detoxed engine (The cam hasn't been changed at all). Any thoughts on the subject are most appreciated. Kurt D. Del Bene ...!ihnp4!homxb!delbene