Hopefully the new Renesis rotary has solved the unsolvable-for-40-years apex seal problem.
sammyb:
As far as I know, the apex seal problem has been solved for years. NSU, Curtis-Wright and GM never really got these seals worked out, but Mazda finally solved the problem (using seals with very high carbon content and more carefully ground chambers).
The "thirsty nature" of Wankel engines comes for the long slim combustion chamber. Rotarys have far more surface area in the combustion chamber than piston engines....thus, they tend to "quench" more of the fuel mix (this creates obvious emission problems too). Twin plugs and fuel injection has helped, but it's still a problem. Also, rotarys meter a small amount of oil out of the sump into the intake manifold (as a sort of "pre-mix") during hard acceleration...adding to the emissions problem.
We have an RX-7 that races in our club. It has well over 100,000 street miles on it and has never been touched internally. Runs super strong (but terrible gas mileage....12 gallons an hour).
We also have a race-only RX-8 that throws the longest exhaust flames on overun that I've ever seen....I hate to follow him closely for fear of toasting my Spridget.
I've seen a 13B rotary in an MGB too. The owner said it's neat, but that it was a huge pain to fit due to the "funny shape" of the engine. Apparently, that's why Ford V8s are more common in Miatas than the Mazda rotary. This reminds me of the old Chevy Vegas. They were build with a huge powertrain tunnel to accomodate the planned rotary engine that was never used.
TC: If that Model T is really your daily driver, then you're my new hero!