Martin Orro wrote:

Greetings Paul,

 If:

 1) hi-volume/hi-pressure injectors are expensive

 2) optimal BSFC is obtained at the end of the runners

 3) hi-press fuel systems are more complicated and expensive

is it possible to use TBI injectors/fuel system directed into the end
of the runners, surrounded by the plenum, downstream of the throttle
body?

 Would Tracy's EFI controller be able to control TBI units?

 Since big-block trucks use (IFIRC) two-barel TBI, are hi volume
injectors available at a reasonable cost?

        Is there a relaibility issue between TBI and TPI injectors and/or
systems?

                Just wondering,                 Martin

I disagree with your first premise. The injectors you buy from
JC Whitney at $30 to $50 each, on page 200, in the  June Catalog are
probably the same ones you pay a lot more for from a Mazda dealer.
Made by the same companies. There are only four or so companies that
make injectors.


http://www.jcwhitney.com

You just need to get an injector that flows enough fuel to
handle about 50 HP each or above.

It would be tough to design a manifold for a TBI that would insure that
the fuel distribution is even and equal to all four or six ports. It
would be a step back to carbs.

Paul Lamar

On the Moller engine we used TBI type injectors because they were shorter
(but fatter) and easier to package (for reasons I don't quite remember)
when spraying directly into the end of the runner.  It worked great.

Jeff Spitzer

One per runner Jeff?

Paul Lamar
 
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