I have been curious about this, since there are injectors and pumps out
there that can support lots of fuel and power, would it be better to
place the injectors at or near the point of peak compression in the
housing or at the intake portion of the housing like the newest Mazda
rotary concept? What about angle? My thought is to do a combination
direct and port EFI system for my next project.

Steve Ross


The problem is getting the fuel  thoroughly mixed with the air.

Injectors at the beginning of the runners gives the lowest fuel burn
for the HP generated.

Not used in racing cars because the throttle response suffers.

Paul Lamar


It appears that quit a bit has been left on the table. Since this research pieazo fuel  injection has been in mass production, as have very powerful ignition systems. Also fuel rail pressures can be very high as on large diesels. Tailoring combustion specifics to maintain high exhaust gas numbers inhibits further development. The new R-16 rotary cutaways show an injector in the suction area before intake closing.

The old prechamber of the RX-2s and 3s kept EGTs white hot, but outside the engine and before the converter. This was to fool the EPA on HC emissions but it worked fine so long as the little fan belt held up and kept spinning the air pump. My bet is that Mazda has all of this in hand even for California where only flowers and kittens may escape the exhaust pipe.

Lynn E. Hanover


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