The throttle body FI had some advantages over carbs.
Providing equal air-fuel ratio mixture to more than one cylinder
drawing mixture at a variety of throttle settings from a remote
source is real tough (maybe impossible). A manifold with design
features to improve cylinder filling is even less likely to be able to
provide even AF ratio over a wide operating. It is Best to keep the
air distribution and fuel distribution functions separate, and port
injection does that.
Whenever emission regulated cars jumped from carburetors to fuel
injection pretty much all the poor driveablity problems disappeared
instantaneously.
I figure that if the injectors are above the throttle plates, or
>>anywhere<< but in the cylinders' individual ports, then the HUGE
advantage of guaranteed even fuel distribution is likely lost.
If the goal is simply a good running engine (definittely a worthwhile
goal) , then the hi mount injectors can be pretty rewarding.
A full electronic control with accurate and appropriate fuel and
ignition map is a wonderful thing, but does not come in a UPS box.
On Tue, 16 Oct 2007 21:26:15 -0400, Bill <edison@[EMAIL PROTECTED]
> wrote:
>Hi-
>
> Have a few old FI intakes and want to convert one of them to EFI but
try to
>avoid welding if possible. I notice that some throttle body injectors, as
well
>as a few mechanical FI setups have injector nozzles *above* the throttle
blades
>and wonder if anyone has tried this with EFI, and if so, how good or bad
did it
>idle? This kind of setup would make it easy to make EFI adapters for
older
>Hilborn and Crower type intakes by adding an intermediate piece (to mount
the
>injectors) between the ram tubes and the throttle blades.
>
> Any thoughts?
>
>cheers,
>Bill
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