I need some guidance!
    I understand that injectors upstream of the combustion
chamber improves gas consumption--by how much?????

Don't know. I don't have any data. Jim Mederer said measurable.

The way mine is being laid out, the manifold injectors are
about 3 inches upstream.   Is this good enough?

Probably not for full benefit.

    Other possible locations are right at the outlet of the turban,
with the throttle on the intake side of the turban.  Would the heat
of vaporization cool the charge enough to eliminate the need for
an innercooler (5psi @sealevel)?  Or,

Well 5 psi is not much. You might not notice the difference between
an intercooler and no intercooler at sea level. As I understand it the intercooler 
becomes more important at high altitude as the boost must go up to maintain
the same HP as at seal level. I personally would not build a turbo
engine for an aircraft without an intercooler. You risk detonation
which will fracture the apex seals.

I don't expect the fuel to cool it much as the fuel is 1/12 to 
1/14 of the air by weight. Do you have HP Books Turbochargers 
by Hugh MacInnes?

    Right into the intake of the turban.  Like Merlin did on some
of their superchargers in WW2. That should mix it well.  As
always, the throttle would be upstream of the injectors.

Does anyone have any information as to the relative efficiencies
and safety of these methods?

Thanks

Bob Darrah

 
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