So when it comes to rotary engines, i so far understand that generally speaking the bigger the port, the more strain it puts on the engine, i.e, a standard port engine will last longer then a PP if both were treated the same... so if i wanted to build a single turbo 13B REW (if that makes much difference), when aiming for a low boost setting of 300rwhp and a higher boost setting of 400rwhp, would having a street port or an extend port be more reasonable? if i should do as much as possible to take care of it, how long would it last? and would things like balancing the rotating assembly, installing larger studs, drilling out the oil galleries etc increase it's lifespan ? thanks

 

For that power level in a street driven car, you're going to want a street port anyway. There is no real difference in reliability on a street port vs. stock port. Really most port types (j-bridge being an exception) don't impact reliability as much as how you tend to drive the car with those port types.

The lifespan of the engine is going to depend on the condition of the parts used to build it, and the quality of the work and tune. If you want a high power engine that is going to last 100K+ then you need to start with new rotor housings, rotors and irons that are well within spec, an overbuilt cooling system and a quality tune.

Studding is a plus though not required, and modifying the oiling system is really only necessary in a race scenario.

 

heat = stress = shorter life-span. That's true for any engine...rotary or piston. Now add forced- induction/turbocharging. That adds more heat which = more stress...and so on.
IMO everything begins with a sound effective cooling system...including things like oil cooling and Auxillary Injection.
I think the stock oil system is pretty effective. I don't hear alot of guys having oil related issues... though I would get rid of things like the wax thermo-pellet. And I've never heard of porting affecting engine longevity either.

 

I concur. As long as cooling mods are performed with power mods, you are good to go with a streetport without any longevity compromises.