Converting the cowl from Vans to Sam James

[gasman]

Webb, those are excellent numbers! Please take my buck and buy yourself a beer

If you get an extra moment, how about measuring the inlet and exit areas of the stock cowl and the James cowl? I'd like to compare your results with some theory.

http://www.vansairforce.com/community/showpost.php?p=559318&postcount=11

 

[hydroguy2]

James Cowl inlet size is 4.750" ID, outlet hole on mine trimmed flush with firewall is 14" along the top, 3.5" tall and has a radius edge to a 12.5" bottom lip. I have Vetterman 4 pipe (1.75" OD) So here is how I calculate the areas:

Inlets=35.44 sqin
effective Outlet=35 sqin

what does that mean? I have no idea, but looks like a 1 to1 ratio. I like the speed my plane has and don't want to make a change that will hurt those numbers, but could use a little better summer/climb cooling.