Re: New block
Hot exhaust gasses want to expand. This is why you see very high volume exhaust manifolds on engines used in such applications as heavy trucks and boats.
The difference here is the exhaust flow is effectively "supercharged" by the exhaust stroke of the pistons. I don't things like velocity and cross sectional area of exhaust ports is as important as the intake side so long as it is more than adequate.
The intake side relies on pressure differential in order to move flow. This is why velocity, momentum, reversion and other phenomena are important to getting the highest performance possible.
|