FEOA Forums banner

Size of Intake Piping

964 Views 8 Replies 6 Participants Last post by  TheBlade
Part of the Grassroots Motorsports article on the Protege/EscortGT caught my eye. According to David Avard, "most of the intakes sacrifice torque...besides the stock VAF is restrictive enough to limit anything you might do with intake piping."

My question then is whether there´d be any benefit to going with a slightly smaller diameter than stock for the intake pipe. Keeping the stock VAF, but a 1/4" less sized pipe might yield greater airflow speed, better filling of cylinders, etc. Don´t know if there´d be any measurable horsepower reduction at high rpms. Has anyone tried using a smaller diameter pipe in order to maximize torque over horsepower? Or anyone want to discuss the merits of such an effort?
1 - 2 of 9 Posts
When using a smaller diameter pipe, at the same engine rpm, the intake air would have to be moving faster through the pipe, that´s just physics. But the speed effect would be negated when the diameter increases at the TB and then into the intake manifold. I suppose that only somebody like Blade running turbo would notice the effect of a smaller diameter pipe, since he´s pushing more air through a smaller pipe, intake velocity would be even greater, resulting in increased cylinder filling during the intake stroke... It´s all theory, but hell, it might make a difference?
1 - 2 of 9 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.