cut
I am not sure how you get the 310 cuft per minute. We know that 1.3
Liter / 2.6 Liter engine is
equal to ~40 cubic inches per chamber.
40 cubic inches / 1728 * 6000 rpm = 139 cubic feet per minute per
rotor, or 278 cfm for two rotors,
which is not too far off from your number of 310 cfm.
This is how I got it.
Paul Lamar
Paul,
that is a good chart.
It is hardly worth talking about but it shows volumes at 80 %
volumetric efficiency and the chart
coincides with my number of 278 *.80 = 222 cfm at the intersection of
the 6000 rpm and 160 cubic inches
lines.
(I suppose by oversight you picked the 7000 rpm line.)
Rolf
7000 RPM is the RPM of choice for a 2.85:1 PSRU. Tracy is getting 7400
RPM top
speed at 217 MPH. The RX8 engine generates peak power at 8500 RPM.
I also corrected the data to 100% Vol. Eff. as a guess. Actually it
should be higher than
that as P Ports are typically 120%. That would change my CFM number to
370 CFM
and increase all the runner velocities as as well. It is the
fundamental reason the
Wankel can generate so much HP for such a small displacement. No intake
valves to get in the way.
Paul Lamar
I am using the 2:17 drive and don't expect to run the engine above 6000
rpm. This correlates with the bearing load sweet spot. Jerry
For some reason I thought you were going to use the 2.85:1. Makes sense
to get more power from the coming RX8 engines. Well then you will need longer pipes
but only by an inch or two.
In this design there is more flexibility as a one inch change in the lateral
position of the 180 bends results in a 2 inch change in the pipe length.
In other words unlike the Russell it has more flexibility of design.
There is also room to move the plenum closer to the engine and the 180 bend
further out towards the cowl. If you are worried about fuel spills you
could enclose the injectors in their own sealed box with a fuel drain.
Paul Lamar
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