Intake runner lengths

[James Weiler]

mazda has used it on a few of vehicles, so my probst book says, and acura 
used it as well..possibly on the NSX.  The mazda system is also RPM 
dependent and regulated by a vacume diaphram.  I'd love to work out 
something like this for my V8 but I had better get it running 1st. :)
hope this helps
jw
 

On Sun, 13 Dec 1998, Bruce Plecan wrote:

> There is only one system I know of using the 2nd Butterfly/runners,
> and in that system them turn on a second set of injectors, the
> secondary injectors run at the same duty cycle as the primary.
> BTW, on that system the sec buttterfly was operated by a vac.
> diapharm.  While seemingly crude it was what the ZR-1 vettes
> used
> Bruce
> 
> 
> >I am modifing a OEM multipoint inlet manifold that has dual runner lengths
> >there is a butterfly
> >arrangment inside the manifold that alters the runner lengths at a desired
> >engine speed.
> >
> >What I am wanting to know ( while we are talking runner lengths) is what
> >sort of FUEL and ignition MAP modifications should I be doing for this type
> >of modification. Assuming that I will be having ( hopefully ) a much
> flatter
> >torgue curle over the entire RPM Range. For those in Australia interesting
> I
> >am using a ford EF/EL 6 cylinder manifold that is modified to fit a 265
> HEMI
> >tripple weber manifold. I hope its worth the effort We will see. Anyone
> >outthere done a simular mod ??
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >Best Regards,
> >
> >STUART BUNNING
> >SALES ENGINEER
> >KENELEC PTY LTD
> >
> >23-25 REDLAND DRIVE
> >MITCHAM VICTORIA 3132
> >AUSTRALIA
> >
> >PHONE:  61 3 9873 1022
> >FAX:    61 3 9873 0200
> >EMAIL:  stuart at kenelec.com.au
> >WEB:    http://www.kenelec.com.au/
> >
> 
>