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| Engine Technology From the novices to the pros, talk about engine technology. Moderated by David Vizard, professional engine developer and well-known technical writer. |
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05-07-2008, 02:24 AM
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1969 Mgb
Hello,
I have a 1969 MGB with a pair of HS4 carburetors and I would like to modify them as David Vizard lays out in How to Build HP #2-Carbs and Intake Manifolds. If at all possible I would love to hear if Mr. Vizard still recommends these modifications or if he has updated them. Also, as this is the only set of these I have I would like to make them correctly the first time, so if any one has more pictures of these modifications I would love to see them. The carbs are the stock HS4s that came on the 1969 MGB. I was also curious if there are Scatter pattern cams available for the 1800cc MGB engine. I believe that Mr. Vizard either designed or help design these for the A-series engine which I think that this engine is very similar to. David, have you done any tuning on this engine and is it as similar to the A-series engine as it at first appears? Well, that should be a start, I will probably add more questions regarding this vehicle in the future. Are there any other MGB owners here? Thanks for any and all help, Howard 
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05-12-2008, 10:32 PM
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David,
I know that you are a very busy man, but do you happen to have more detailed pictures of your modifications to SU carbs? I have HTB HP #2 and can get a decent idea of what to do but I like to do as much research as I can before I try something. I would hate to destroy a good set of carbs. I would assume that one squares off the area before the piston and after the throttle plate and removes casting flash wherever it is while not hurting the seal of the throttle plate or the piston or the hump where the jet/needle are. Anywho, any help would be great. Thanks, Howard
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07-24-2008, 02:08 PM
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David,
In your big yellow book on A-series engines you say that after performing these modifications the needle is most likely not correct. It seems like it would tend to lean out the mixture since it will flow more air for any given amount that the piston is raised (vacuum behind piston). Am I correct in this thinking? I did not modify the bridge, just the area where the piston is and the throttle shaft/blade. Thanks, Howard
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