Quote:
Originally Posted by Madact
but hot, recently burning gasses exploding out past a valve assembly are going to be turbulent from the get-go,
|
There are no explosions involved, the valves open smoothly on a smoothly curved cam, initially allowing a tiny flow which smoothly increases before being smoothly closed again. The exhaust gasses should flow smoothly out the ports and down the pipes. Even the burning of the fuel isn't an explosion as many people think, it starts burning at the spark and the flame spreads out smoothly through the piston giving a smooth increase in pressure.
If things start exploding then things are going wrong, that is what detonation is and that destroys engines.
The main job of the header is to transport the exhaust gasses, they will flow easier through nice straight pipes, putting extra curves in to get equal lengths seems very questionable to me.