geetee03

imagine running with a straw in your mouth, the 4v would be a fat straw and the 2v would be a skinny one. you'll of course run out of breath faster with less air.

stangc83

Ok i have a good science about cars for you guys. He who has more money will have faster car. you can have a guy with an 03 cobra but have no money to spend on it. But then some rich guy who knows nothing about stangs and have a 99 GT with 15 thousand in it. the GT will win.

70 MACH I

But the 4v does not suffer from any loss of velocity like this. The intake and camshafts, plus the 4v design (two, smaller ports instaed of one large one) allows it to take advantage of the extra flow without loss of velocity.

I agree totally with port velocity, the thing you are forgetting is both engines 2V and 4v are THE SAME DISPLACEMENT. A 2V engine will develop peak torque EARLIER in the RPM range than a 4V. The 4V will overcome the 2V once it can process the extra fuel/air it consumes. Cylinder packing is optimized through inertia, and as you aptly stated, port velocity, which is a direct function of engine speed. There is a spot, or band within the RPM range, where the 2V will pull harder TEMPORARILY over the 4V.

John

torched04

you and bill nye the science guy have been hangin out again havent you?