Paul

I am still playing catch up and I might have missed some of the reasons for
injecting the fuel directly into the bell mouth that resides within the
plenum chamber.  Is this an application that would work with a turbo boost
as well or would it be safer to keep the injectors closer to the stock
location?

Doug in Japan

With Jerry's set up it is just easier to construct. Other wise you would have
a plumbing and fabricating nightmare with four injectors pointing every which way.
The precedence is Formula One racing cars sometimes do it this way.

I think it would work with turbo boost. The trouble with the stock
locations is there is more chance for fire and you don't need rapid
throttle response with an aircraft engine. Mazda also did some experimenting
in conjunction with the Lemans engine development and they found slightly
better BSFC if the fuel had more of a chance to mix thoroughly with the air.

Paul Lamar

Here is another view showing the simplicity of this approach
using the machined air horn/bell mouths installed.

Paul Lamar
 
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