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Old 10-16-2002, 21:35   #1 (permalink)
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Inlet runners

Hi all,

Just a question about the inlet runners (dual length plastic ones) found on the EF. I was told that ideally inlet runners should be short for high revs and long for low revs (please correct me if I am wrong). If this is the case, is there a switch that cuts over from the long runner to the short runner as the revs increase? I noticed that Ford got rid of this design on the EL, anyone know why?

I have noticed that a lot of guys use aftermarket one made of metal without dual runners. Are these heat shielded (like jet hot coating you can get on extractors)? If not, wouldn’t this heat the air as it is running from the filter box to the inlet manifold more than the plastic factory ones?

How easy are these aftermarket ones to hook up to the factory air box? Most of the installs I have seen are connected to a pod filter, I would want to sick to the air box for the time being until I can fabricate some sort of cold air induction.

Thanks for any advice.
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Old 10-16-2002, 21:53   #2 (permalink)
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5-Speed,

I think you are confusing what's before the throttle body and what's after it.

What you have said about long inlet runners for low revs and short at high revs is correct. This applies after the throttle body and takes place inside the cast inlet manifold. At higher revs butterfly valves open and air is able to take the shorter (more direct) path to the valves rather than the longer up-and-over path that it is forced to take at lower revs. This is controlled by the ECU which also adjusts ignition timing.

The concept can be seen in the diagram below.



The plastic item that I believe you are referring to runs from the airbox to the inlet manifold mounted throttle body. I think the EF design was to limit induction noise and resonance. It was probably dropped to a simpler design from EL due to cost or manufacturing reasons.
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Old 10-16-2002, 22:00   #3 (permalink)
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Thanks, that's the bit I was wondering about.
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Old 10-16-2002, 22:12   #4 (permalink)
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Raptor, that's a good picture, have you got one of a Windsor V8?
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Old 10-16-2002, 22:18   #5 (permalink)
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Quote:
Originally posted by TopGhia
Raptor, that's a good picture, have you got one of a Windsor V8?
Windsor V8 => NO.

Barra 220 => YES (click)
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