Paul,
I just remembered that with throttle body next to the intake
ports, there is no way of measuring the MP needed for Tracy's
EC2.m. Installing MP ports so close will give extreamly unstable
readings.
Another thing, this morning I measured the ID of the intake
port on a factory Mazda PP housing I have in the hangar.
It is 1.7". Just in case some one is interested?
Buly
-----------------------------------
Not true.
You can use a can with a small hole to average out the manifold
readings. Technical word for it is accumulator.
We had no such problems when we ran Tracy's EC2 on the dyno
with the P-port. We used a tee that samples both ports
simultaneously in effect averaging the two p-ports.
Also a pressure tap into the compression chamber after the port
closes will also work as Tracy samples the manifold pressure
reading only once at a specified E-shaft angle. Tracy can change
that angle in software of he wanted to. Also Tracy could sample
the pressure reading several times at different e-shaft angles
and average them in software which would be the easy way to do it.
No hard ware required. I was rather surprised he was not doing
that already.
Another factor is the response time of the pressure sensor.
The type of sensor Tracy uses is rather slow as pressure sensors
go. This in effect tends to average the pressure.
Check out the website as I have recently updated it.
http://www.rotaryeng.net/intake.html
Some stock Mazda P-port housings are smaller than others.
Smaller p-ports tend to work better at lower RPMs for
automotive use. I chose 1.875" because that is close
to the Lemans engine p-port size which I have a lot of power curves,
torque curves, BSFC curves and drawings on. No point in
spending years by trial an error when Mazda already did it.
BTW the Mazda type horizontal p-port opening shoot the air
in at a more favorable angle than the angled down types
used by Racing Beat, Guru and others.
Paul Lamar ...No rotor no motor.
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