Was wondering if anyone has measured the volume of the transfer area on the stock or original performance or repop heads. As I understand it, Mercury engines had a larger transfer area to keep the compression low with the additional displacement. I’m thinking about investing in a 4-71 blower so compression ratio Im not worried so much about as I am getting the best air flow possible given the constraints or without overwhelming the main bearings (not some bonneville engine).
mike davidson discusses this in "street flathead." a lot of people agree that high compression may get you across the intersection faster, but flow is more important.
Wouldn't the "volume" of the transfer "area" be zero? Volume needs height, width and depth. Area only needs height and width. On my in-line six flat head the transfer area is 2.5 sq in, the intake valve curtain area is 2.0 sq in, the intake valve throat area is 1.8 sq in, and the inlet port area 1.6 sq in.
I have his book but didn't find the section you are referring to - do you have a page number. What doe "a lot of people agree that high compresssion may get you across the intersection faster, but flow is more imprrtant" mean? "High compression" may imply more power but it still needs flow to make power.
It becomes a tradeoff, once the transfer area becomes too small to feed the engine with enough air, it becomes counterproductive.... Ken Kloth has a record holding Bonneville Flatty that makes big HP with less than 7:1 compression N/A....
The Jalopy Journal
