Inliners International Forums General Discussion Engines Lump Ports in a Work Truck

In wings, propellers. and wind turbine blades the leading edge is thicker and more rounded than the trailing edge. This may be because in all of these cases some sort of energy is being extracted from the air as it passes.

We are trying to allow the air to pass as easily as possible without removing any energy from it. The energy is being applied from the back side by the drastic drop in air pressure caused by the downward movement of the piston. In our case maybe a thin leading edge is more important since the flow is of a short duration and ends in the cylinder when the intake valve closes.

Maybe it is better to allow the flow to start easily against the sharp front edge and not worry about the turbulence between the back of the boss to the valve because there is going to be turbulence there caused by a lot of other things going on there that is much more serious than air flowing past the round back of the boss. ????????

We are also dealing with a head/port/valve combo that very nearly fits our need stock.