We did some research on this subject and we measured the pressure
in the intake chamber just before the p-port closed.

One strong advantage of the rotary over the reciprocating piston engine is
that there is a place to measure the pressure in the chamber just after the
intake event is completed, and the oil injector port is in that area.  The
instrumentation does not have to withstand the hot gases of combustion.  If
we know the instantaneous absolute pressure and temperature at that moment,
it seems we would have a very good idea of the quantity of the air/fuel
charge.

This would be true whether the engine is turbocharged or not.


Here is the pressure data.



The sensors you would be interested in is the Motorola/Freescale
MPX4250.  They have a great response time (1KHz for 10% to 90% deltaP
transitions) and I have 2-3 I would be willing to loan.

Part number MPX4250AP-ND $12.45 each.

The soundcard in your computer is good for +-1V recording, AC coupled.
It will not record 'static' DC voltages, but since you need a system
that records dynamic signals (above 20Hz), this will work. However, the
MPX4250 voltage range is from 0.3 to 4.7 V.  an op-amp will have to be
used to divide the input signal to within 1V.

Paul Lamar
Paul,

Saw the pressure taps in your msg.  The last I had heard from you, they were  buried somewhere
in your hanger.

Have you found them yet?  If so, I am still, interested in purchasing two.

Joe G.

I will have to make some more. As soon as I do they will show up in the hangar :)

Paul Lamar


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