anyone remember this thread.....

http://www.locostbuilders.co.uk/viewthread.php?tid=3394&page=2

in it i had found a fairly good website about how to tune intakes... how wrong i was. also look at what kingr said about having too much time. Well im currently doing my 3rd year project on designing the intake an exhaust manifolds for one of my lecturers hill climb race cars.

the guys on the link have a really simplistic view of intake design. Here im looking though book not just on resonance but also wave action modeling and some nice hyperbolic partial-differential equations. and what kingr said about too much time on theyre hands.... yeah i dont have any free time because im doing this god damned project. btw also using the lotus engine simulation software which is quite a nice bit of kit.

http://www.locostbuilders.co.uk/viewthread.php?tid=3394&page=1

I think it was BMW that made variable length trumpets and they worked very well in one of their old touring type cars to the point where when people found out they banned them as it was a vary unfair advantage. According to my lecturer anyway.

'variable intake geometry' was fitted to my 1997 mazda 323 V6 zxi.

When I had a XJ-S, a company called aj6 enginering claimed to make a modded intake that didnt so much add power but increase torque by 10-15%


http://www.jagweb.com/aj6eng/technics.html



atb

steve

Theres a few manufacturers that do it out of the bag (vauhall on the omega v6 24v, ford on the BOB Cosworth 24v etc) and Pierburg make them very simply using a U-shape tube with a flap in the middle for the Corrado VR6.

Geoff

I recall, many many years ago, coming across a paper outlining how variable length tracts were tried on the first Peugeot 16v engines. That's the FIRST 16v engines, way back in the early part of the 1900's. 1918-1920 or thereabouts.

Nothing's new, just recycled!

Syd.

The current Fiesta ST has "inlet manifold runner control", valves that change the resonant length of the intake manifold depending on RPM.

[Edited on 10/1/06 by blueshift]

the honda ivtech has two different inlet tract routes which are switched by a roller barrel type setup on the inlet.

I've also been round the williams museum at williams f1 and on of their video's showed vairable sliding inlet trumpets on an old f1 car..

Ned.