SB Intake.

livininharrow said
no need to take classes regarding fluid dynamics. we are talking vapours here. the rougher the intake runners are the greater the fuel droplets will be broken up and the fuel will be ignited much better than with a smooth intake runner. the exhaust will be a different story. have fun with this one boys

Sorry guy, I had the classes, and took notes. Whether you are talking air/fuel or just air, it's fluid dynamics. ANY step will cause a sudden expansion or contraction depending on the geometry of the step, either way it lowers your flow energy. It's just like driving when something is in your way and you have to swerve at the last minute, It interrupts your flow. :poke:

At the point where you have the step, you will induce a turbulent flow. This will slow down the flow in the port at that point. Slowing the flow, is ruducing your velocity of air at that point. Rick Mudge summed it up once, "velocity is torque". When you lower your velocity, you loose torque.

Who is Rickl Mudge??? :dontknow:

He ran the flow bench at Chrysler and helped design the 5.7 Hemi head. :notworth:

He also built a natrually aspirated four cylinder and put it in a rail which set the record at Milan Dragway in that class by running mid 8's. :king: