Short induction - How does it work?

[_Neal_]

Hi all - was wondering if someone with tuning knowledge could explain why a "short" induction kit (e.g. whirlwind pipes) gives a bhp gain on a 4.5 beyond the standard "long" purple pipes. As I understand it, the explanation goes beyond the fact that the purple pipes can contract at high revs and reduce air flow.

Also, given that this is the case, why didn't TVR fit a shorter system to the 4.5 as standard? I'm guessing shorter pipes have to be better-made than the longer ones, and therefore cost more.

Thanks

Neal

[_Neal_]

Thanks very much trackcar - I thought you might be the man who could answer the question

Once I've owned my 4.5 for a bit longer (and have a bit of spare money) I may well be in touch...

[_Neal_]

No-one likes a show-off with blue pipes

Edited by _Neal_ on Friday 5th October 17:32

[_Neal_]

Thanks Jules - have read through - very interesting stuff (especially the bickering )

Cheers

Neal