Pod intake length - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

Axeman82 · 12-20-2002, 16:09

Does the intake pipe (between pod and throttle body) on a pod system have to be a certain length. I read that it needs to be 130% of the engine capacity to prevent vaccum. This means on my 3.9L engine that the capacity of the pipe needs to be 5L which equates to a 100mm diameter pipe and 650mm long which seems much bigger than the aftermarket ones you can buy off the shelf.

Thanks..

Dan..

EDXR8 · 12-21-2002, 03:32

Axeman82,

The distance between the throttle body and pod makes no difference. On many cars (falcons and commodores included), the pod is placed directly on the throttle body. The critical factor is the volume of air between the intake valve and throttle body, or the plenumn volume. The reason the pod is moved as far away from the engine is for heat, nothing else.

ebxr8240 · 12-21-2002, 04:23

EDXR8 correct on 6's but on maf[v8's] there needs to be some sort of length to prevent reversion of inlet pulses and it plays havoc with maf at low speed esp with a 1/2 decent cam and decent heads/inlet. But 6's or map it doesn't matter.. I guess the reason Ford fitted that horn on the inlet pipe from E.D V8 onwards, harmonics !!...