Intake Runner Length

[Bruce Plecan]

-----Original Message-----
From: Van Setten, Tim (AZ75) <Tim.Van.Setten at CAS.honeywell.com>
To: 'DIY-EFI' <diy_efi at efi332.eng.ohio-state.edu>
Date: Wednesday, January 27, 1999 4:30 PM
Subject: Intake Runner Length


 We are using a speed density
>system and also a dual-fuel setup.  We turbo charge our little girlie
2300cc
>VW's in a 900 lb car and head to the sand dunes.  The dual fuel is
>accomplished by adding a second set of injectors and injecting methanol
only
>under boost.  This makes these air-cooled engines very happy and stops all
>of the pinging problems etc. associated with 15 lbs of boost.

What for ecm?.

 We want to try
>different intake manifold combinations.


For plenum, start at engine displacement, and going as high as 2x
displacement wouldn't be a worry, as long as it worked.
When I can I build the plenum, so I can add layers of spacers.
I'd also, do that for runner lenghts if I were you.
Now, the runner diameters is a real nasty issue, ie lots of possibles.
Stock Car Racing Mag several years ago had an article about them
as I recall.
  With a VW head aren't you rather limited in port diameter?.
Bruce