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Reply to "Carburetor"

 Yeah, what Jim said above! Some engine (and transaxle) builders really don't like being contradicted. THAT said-

34 mm venturis in 40 mm carbs should allow a 2276 to go to 6,000 rpm with good power- it's been done before-                     https://www.thesamba.com/vw/fo...rder=asc&start=0

40 mm Dellortos will accept 34 mm venturis readily with no problems. There are some models of 40 mm Weber IDF's, though, that that have a smaller diameter at the carburetor top and 32's are the limit with these. There are IDF's with the larger inner diameter tops (I've been told the same as the 44 IDF?) that you can put 34 mm venturis in. I'm of the understanding that the 40 IDF's with the smaller tops can be machined out to the larger size (although don't quote me on that). I don't know about HPMX's or anything else.

I believe 40 mm carbs on an engine like this will be really close to (or even at) their limit- I've never heard of an engine this large making power to 6500 rpm with these carbs. Doesn't mean it can't- I just don't think I've ever heard or read about it. The great thing about using carbs this well matched to the engine size/power output- instant throttle response throughout the rpm range and the best mileage possible! Al

PS- @Michael BalastrieriWho do you have lined up to build the engine? What heads are going on it? Do you know what compression will be set at? Cam/rockers? exhaust?

Last edited by ALB
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