Bill Freeman wrote:

                                SNIP

Paul,

Is the 'cooling the cast iron seals' with the oil injection due to reduced
friction,
or due to actual cooling effect?  If only cooling, but not actually

lubrication,

would a coolant injection (water-methanol, for example) work as well,
besides the
intercooling effect helping for very high allowable MAP.

I would guess that the lubricationg effects, which would reduce the seal
tip temp, and not so incidentally, the rotor housing wear would be the most
important.

Bill

Quote Mazda SAE 900036:

The sudden increase in seal temperatures indicated to the left
of point B indicates constant metal temperature. End of quote.

>From this
I assume most of the seal temp comes from combustion gases. I think it was Jeff
that pointed out the apex seal is the first part that opens the peripheral

exhaust

port forcing all combustion gases to flow right past the apex seal.

The latest computer controlled oil injection  pumps take into consideration
water temp as well as intake airflow and RPM.

Paul Lamar

  Paul,

 Since increasing the lube oil flow does not increase cooling once a
critical flow is reached, it would seem that this is due to "enough to
lift the seal off of the rotor housing is enough" and more does not
help.  So, lube it is and cooling injection would probably not be
helpful for tip seal temps, altho it would still lower the charge temp
and inhibit detonation, which would allow really awesome MAPs.

Bill

I don't quite follow you Bill. "cooling injection"?

Paul Lamar
 
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