Reply to "Cam for Weber Carbs"

Peter,

I don't know if your application is street or racing. My reply shall focus upon street applications.

Every single cylinder motorcycle, every gasoline powered lawn mower, every 4 cylinder sport bike with 4 carburetors, every two cylinder motorcycle with twin carburetors (BMW), every gasoline powered generator, every chain saw, etc ... ALL are equipped with individual runner induction. Ferrari, Maserati, Lamborghini, Porsche, Aston Martin, all were once equipped with IR Weber carburetor induction. There was even a Ford Rally Race car available off the dealership floor with individual runner induction utilizing IDF Webers. Its not an impossible induction system, it just requires proper engineering. When you search for info on the internet you have to sort the BS from the good information.

There is a Pantera owner in Texas whose Pantera motor is equipped with IDA Webbers, he has no drivability problems. John Taphorn (member name JTPantera) may be able to put you in touch with him.

For the street the cam should provide low overlap, fairly well centered around top dead center, and reasonably early intake closing. This helps minimize any "reversion cloud" issues, which are the main stumbling blocks with using IR carburetors on the street. Such "reverse pulses" are exacerbated by IR induction because of the lack of a plenum to dampen and minimize such pulses.

My preference and recommendation would be to use the IDF carburetors, not the IDA carburetors. The intake manifold for IDF carburetors is available from a business in Australia named Aussie Speed, but it is imported into the US by a business in Texas named "Small Town Speed". I don't know if there would a more direct route from Australia to Germany.