evelrod
Automotive
- Jan 15, 2001
- 3,255
I have been taken on myself to do a refresher in port configuration as it relates to airflow dynamics. I am about to "port" a cylinder head on a vintage racer and since it's been about 20 years since I did one of these I thought I would catch up on some "modern theory". In my research, I found something that, even at my age, totally surprised me. This is a partial quote from an article in 1993.
"There's another way to get airflow, but not by changing the head or manifold. (We)...found that the pressure plate in a tight bellhousing kicked out 700 CFM of 10 PSI air pressure at 7000 RPM. Races have been won that way---with the exit from the bellhousing somehow linked to the bottom of the air cleaner. How much will it put out? If you get serious about the (design)..., how about 30 PSI at 7000 RPM?" Smokey Yunick.
Rod
"There's another way to get airflow, but not by changing the head or manifold. (We)...found that the pressure plate in a tight bellhousing kicked out 700 CFM of 10 PSI air pressure at 7000 RPM. Races have been won that way---with the exit from the bellhousing somehow linked to the bottom of the air cleaner. How much will it put out? If you get serious about the (design)..., how about 30 PSI at 7000 RPM?" Smokey Yunick.
Rod