quichote wrote:

Paul,
Question; I read on someones website that peri-porting "motor will not
run below 2000 rpm"  Has the PowerSport motor solved this?

Chris Cosman

P.S.  Has anyone thought to use the intake side of the turbo to pull air
through the radiator cores.  I realize that this heats the intake
air,reducing hp, but if you eliminate the cooling drag...more for less.
At least, this could keep the motor cool on the ground.

Thinking out loud.

That is not true as I just drove a carburated peripheral port 
NSU RO80 in Germany and it pulled away from low RPMs (less 
than 1000 RPM) no problem. It does idle rather poorly however.

Everett improved the idle greatly by moving the throttle butterfly
plates just inside the rotor housing. See the ACRE NL web site for a
drawing on such a peripheral port butterfly arrangement.

NSU later moved to side ports but there was no real need if
they had gone to electronic fuel injection and discovered what 
Everett had. Bosch had electronic fuel injection on
my 1968 VW Squareback. You could trade your EC computer
in those days for a rebuilt one for $75. Try that today.

Using the engine to draw air in through the rad might work.
Based on the differences in intake area required I would
say that in addition to all the drawbacks you mentioned above
it would be inadeqate to cool the engine at idle. At high speeds
you would be left with just the loss in HP. I intend using an 
electric fan for taxi and idle. 

I also like Tracy's idea of dribbling water over the rad during 
taxi and climb out. Converting water to steam extracts a lot of 
BTU's out of the radiator for a relatively small amount
of water.

Don't forget to fill the water tank however each time
you land. 

The chart is for Mean Effective Pressure which is 
proportional to torque. Just think of it as just
another torque curve.  perip81.jpg

Paul Lamar
 
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