Hi Paul,

I was thinking; ya I know it's a dangerous thing to do. Normally leads to
trouble sooner or later. The thought was; could the rotor radius be increased
a bit making rotors and rotor housings and be able to use the Mazda end
housings. A bit more radius would increase the displacement and torque/HP with
the same outside dimension + or - a hair. If people are going to the trouble
to build their own parts, might as well get more benefit from the effort
required. Yup, already thought about that some more also. Mazda K factor is
close to 7. You know they did a bunch of R+D with respect to this for optimal
housing shape, apex seal lean angle, etc. R 112, e 16: R 140, e 20. These
dimensions would require end housing design also. The R 140 with a 80 width is
almost twice the displacement of the RX7 and RX8 engines. With light rotors
serious power would be possible. One rotor with 200 -250 HP and not much
heavier than what you have now.

Dale Davies

The wankel is unique in the sense that any one parameter cannot be changed
with out affecting all others. One can stroke or bore a piston engine but other
than adding rotors or rotor width there is no way to change just one dimension and have the engine still work.

Paul Lamar