Wallzy
New Member
ninety15.0 is correct, there is some math, but there are many other considerations. The inner radius around bends can not be too steep or the flow will separate causing reductions in flow, the diameter should be chosen correctly to maintain the correct port velocity for the engine speed and displacement characteristics, and attention should be paid to the transitions at any adjoining surfaces as these also cause flow separation. Fluid dynamics only goes so far, as an IC engine is an Nth order polynomial. The intake is an open and closed reed system with a throttling valve and usually one accumulator chamber. The flow driving mechanism is a dynamic system involving temperature, changing velocity & pressure, as well as what is called the "Gulp Factor." These factors are why people with a lot of porting experience, trial and error research, and lots and lots of flow testing are more effective than using math to model an intake design.
Walls
Walls