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

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