Jerry Hey wrote:

Paul,  I don't know much about fuel injection so this may be a very
ignorant question, but are there fuel injectors appropriate for the
13-b  that screw in?   It would be  a lot easier to come up with a
threaded boss than a clamping mechanism.  I admit, I don't know why
they are designed the way they are.  Years ago, I had an Air Flow
Performance intake that had screw in injectors.

Second question,   What size single throttle body do I need?  With my
engine I inherited a very nice twin  1 3/4" throttle body.  I don't
know if it is Mazda original equipment.   I would rather have a
single because of space limitations.

Thanks,   Jerry

Not that I know of. Most of them fit in a smooth bore with
an O ring seal. Same goes for the fuel rail. The fuel rail
holds the injectors into the smooth bore in the intake
manifold proper. BTW the simple trick to make a fuel rail
is use 1/2 inch square steel tubing with round slugs
welded on. Ream the holes for the injectors to get a
smooth bore for the O-rings.

Twin 1.75" TB's ought to work pretty good. I suspect the Le Man
engine with peripheral ports was 2 inch to 2.25 inch ID TB's per
rotor. Course that was generating 120 HP per rotor at 6000 RPM.
Side ports just don't breathe as well so a smaller TB is fine.

Paul Lamar
 
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