Air Dams and Cooling Air
as for your Engine's Cooling Air, because Hot Air expands the Exhaust Hole in the back of your Cowl for the Cooling Air to escape should be 1.5 times larger than the Air Intake Hole on the front of your Cowl,,example> if the Intake Hole is 2 inches square the the Exhaust Hole in the back of the Cowl should be 3 inches square, even larger, if not you will get a build up of Heat inside your Cowl,,
Note that you should not have a Cross-Cut of air interfering with the path of your Cooling Air,,
Air Dams are great, but, A) where they meat the Head and Jugs they should be as close to the Fins as you can get them, they should overlap to the back of the Jugs and Heads to force air into the Fins, B) the Intake of the Dams can be larger than the Heads and Jugs, but after the Dams Pass the Fins the Dames should end, again the Exhaust of the Hot Air should be 1.5 times larger than the Dams,,
Cool Air Intake for the Carb, it should not seal completely around the Carb's Intake, because this can force unwanted Air into the Carb at different Air Speeds and this will mess with Tuning,,
later I will try to find the site where you can read up on Air Dams
Jim
Last edited by the Wasp; 03-12-2018 at 07:23 PM.