<< As Vance said it has been done. There are half a dozen SAE papers on direct
 injection stratified charge rotary engines.  There is little or no BSFC
advantage
 at full or cruise power levels. Just a lot of expense. In effect the RX8
engine,
 with the side exhaust port, pretty well achieves the same thing as
stratified
 charge by recycling unburned fuel.

 Paul Lamar
  >>

Is there anything on overboosting a gasolene engine with direct injection?

Lynn E. Hanover

What do you mean by over boosting? Sounds like a prescription for detonation.
As opposed to pre ignition. Two different things. Lets define detonation
as an extremely rapid burning of the fuel and pre ignition as the premature
ignition of the fuel relative to TDC.

Paul Lamar

Correct me if I am wrong but what I think you are saying is boosting the engine
to the point of pre ignition and side stepping that by direct injection.
That sounds like a way to get more power and might work up to the point
of detonation. The Mazda wankel is well suited to this due to its robust 
construction. I don't think it would result in better BSFC however.

BTW The engine is slowly becoming more robust (more hollow dowels--larger tension bolts)
as the drag racers are now pushing 450 HP per rotor.  I would not be surprised 
if nitro methane was the next step. 

Paul Lamar
 
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