What's the size of the throttlebodies (34mm or something?) and what's the size of the combustion chambers?
There should be a formula to calculate the max CC size of the engine that cna be used with the stock throttlebodies, right? For example, the stock throttlebodies at 34mm (assumption, I don't know) can only feed a1200cc engine...(another number, not based in fact)? So, is there?
