Intake runner lengths

[Bruce Plecan]

-----Original Message-----
From: Stuart Bunning <stuart at kenelec.com.au>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Tuesday, December 15, 1998 8:28 PM
Subject: Re: Intake runner lengths

OK how does this butterfly open?.  ECM signal?, if so then tap into that and
trigger a solid state switch to change coolant temps.
Bruce


>
>Just to add to this topic. My application is to only have one set of
>injectors The 2nd butterfly's and runners which is not visible from the
>outside simply blocks the shorter path inside the manifold. So when I hit
>about 4500RPM the internal butterfly inside the manifold opens giving the
>air a short cut to the motor instead of having to do a loop inside the
>manifold. If anyone outside of AUstralia has seem one of the late model
>DAEWOO larnos's I think ?? although 4 cylinder they have this dual runner
or
>dual ressonance manifold's on them they kind of look like a 4 snails or in
>my case as i am using ford 6cyl EF/EL manifold 6 s snails.
>
>So what am i asking, after all this rambling on ??
>Well if I use this approach. I will get more torque down low or up high
>depends how you look at it compared to using a standed fixed length
manifold
>So do i have to adjuct my fuel map when the runners change length or is
this
>one of those "FREE POWER" modifications that will give me more torque for
>FREE  without adding extra fuel just because the runners are longer ????
>
>
>
>At 09:38 PM 13/12/98 -0500, you 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
>>
>>
>
>
>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/
>