ah yes this topic. again.
1. if it has a piston and internal combustion, its probably been in a rx7.
2. I have no problems with piston engines in rx7s for the most part. But i frown at people taking a car meant for curve action and emplace a iron blocked supercharged something and go dragging. What a waste of a good designed car. That and the piston swapped owners who do nothing but rag on the rotary engine.
3. in terms of a V8, an iron block is not really that ideal. If you are going to do it RIGHT, use the LS1. You basically maintain the factory weight front/rear and left/right. Granted it does throw of the top/bottom but a decent suspension will make this unnoticable.
4. I personally am more comfortable with the rotary engine. I can rip my engine out damn near blindfolded. I find them easy to take apart and easy to put together. They can take some serious abuse as well. I have had many more engine related issues with piston engine cars.
5. the life span debate also is grossly misinformed. Look at it this way. If you where to take a factory engine of a smaller (<3L displacement) and try to make 450 hp out of it without changing ANY internal components. (is factory shortblock) how long do you think that will last? Most factory engines wouldnt stand up to this for long. This is where the rotary engine sits. When you are making power from it you can only change the intake/exhaust timing and try and keep the motor from blowing itself apart with dowling. But most people use the factory rotors and housings, which are already used mind you. Then use a apex seal usually of a standard steel or alloy composite.
This is basically the same as using used pistons with cyclinder walls that arent honed whatsoever when you put them back in. Then having factory piston rings again.
But there are good solutions to this problem which few utilize because they spend their money on other useless crap. But the biggest is the ceramic apex seals. Usually around a base price of 900-1000 dollars for the set. They can take the shock of detontation and if you do manage to take one out they only crack. Unlike the carbon steel which is grenade like in its destruction. Hell you can even reuse the cracked seals! You lose some torque but they still work!
Then there is lapping the irons and housings and following up with one of the several options for coating the surfaces.
Basically if you build it well, it will work well. Just no one applies this logic to it.
Also for your viewing pleasure. A 20b in a ski race boat using the ceramics. IIRC, something around 900 hp at somewhere above 8000 rpms (constant rpms). For those who arent aware, a boat engine takes MUCH more abuse than a passenger vechile one.
http://youtube.com/watch?v=bpxK2ub-qCs&mode=related&search=