View Single Post
jluetjen jluetjen is offline
Registered User
 
jluetjen's Avatar
 
Join Date: Oct 2001
Location: Westford, MA USA
Posts: 8,594
Garage
One issue that I'd see is that there'd be a step down in diameter from the manifold to the intake ports -- a bad thing. So let's say that you port the heads to match the manifold, then you will find that the velocity of the intake charge may drop compared to the MFI throttle bodies, thus causing the turbulance and mixing to decrease at low rev's. Sure it will flow ample air at peak RPMs, but chances are you only spend a few percent of your time at that engine speed. At low rev's you might have problems keeping the fuel suspended in the air which will result in poor running and a drop in torque at those engine speeds.

If you've got MFI, I'd think that it's a better idea to get the throttle bodies fixed or replaced. They show up on ebay relatively frequently. In the future you can use the same throttle bodies on a different engine configuration with a mapped EFI system. Generally, intake configurations with individual throttle bodies provide better performance and throttle response compared to systems that have a single common throttle body and plenum.
__________________
John
'69 911E

"It's a poor craftsman who blames their tools" -- Unknown
"Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman

Last edited by jluetjen; 07-31-2005 at 11:59 AM..
Old 07-31-2005, 11:56 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)