[quote=pfarber]That video has one HUGE error that we all know of.
At 6:16 it says 'speeded up in one place, slowed down in another to keep the mixture uniform SO THE SAME AMOUNT OF GAS GETS INTO EACH CYLINDER."
REALLY?????? We all know that the intake manifolds do nothing of the sort.... BUT AT THE TIME it was believed to be true.
I don't think that they are as far off as you suggest. Our vision of the shape and design of the intake as a static piece of metal being asymmetric and having shared ports does not take into account the dynamic aspect of what goes on when things are in motion. When a cylinder which shares a port goes down, it draws in a volume of fuel/air equal to one which is unshared, but at a faster rate due to the smaller port. Another aspect is that cylinders which share ports do not demand fuel/air at the same moment in time. We do know that this head design is not the most efficient design ever made, but if it was as horrible as our static, linear notions would lead us to believe, they wouldn't even start, let alone run or idle.
Carl
