- Joined
- Dec 10, 2008
- Messages
- 7,253

swooshdave said:comnoz said:For anyone who thinks 30 mm will not flow enough air I did a simple test. It is a 6 inch long piece of acrylic with a 30 mm hole through the center and a 1 inch radiused inlet and outlet. [nowhere near the optimum for flow]
On the flowbench it flowed 190.5 CFM at 28 inches which is enough to produce 64 horsepower per cylinder according to Superflow's formula. Do you think you need more air than that? Jim
Stick a bend and a valve stem and crap in the middle of that tube and then see. :mrgreen:
And that is the problem and that is why you need to enlarge the port leading up to the valve guide and bowl- so you can slow the air down so it can make the turn. Think of the bowl as a reservoir- you move the air fast down the straight port and then let it expand into the bowl . The fast moving air will pressurize the bowl when the piston stops drawing air at the bottom of the intake stroke. That pressure stops the air from exiting the cylinder as the piston starts back up on the compression stroke. Jim