So i've been looking around racing beat a little and what about a PP 13b rotor housing with Renesis rotors?

Anybody tried Megasquirt on a PP?

Aluminum side housings for equal thermal expansion?

Any use in lightening out the engine for a higher rpm redline?

 

using Renesis rotors in older engines is not without it's own issues. nothing insurmountable, but at the end of the day they don't seem to have been clearly proven to make any more power due to their 0.3 compression point. weight is not an issue because if you can afford to have them grooved for older apex seals, then you can probably afford to lighten older rotors. it's been successfully done several times. a simple search will reveal the projects posted here.
i'm sure.
novel idea, but what's your budget?
not sure what you're asking here ...
lighter housings have nothing to do with redline and if you mean their porting potential, then it goes back to what's your budget? obviously, you need to acquire them to port them. if you're speaking of the rotating assembly, then as long as your porting supports breathing at higher RPM, then yes. lighten and race-balance your assembly with the appropriate flywheel and clutch and use a ballistic blanket/scattershield.

 

Mazdatrix says that Renesis apex seals don't like sliding over ports. At least, they said that when they started playing with the engine bits.

Scandinavian guys who build PP engines for their rallycross/hillclimb cars haven't found much, if any, gain from the rotors.

Yes. I have. It's just an engine, there's nothing spectacular about it to make things like programmable EFI difficult.

Equal where? I don't think that's particularly a problem. The rotor housing probably flexes around more from combustion loading than any kind of thermal expansion.

It'll help in the stratospheric regions, but stock FC internals with minor modifications will handle absurdly high RPM. I think 10,000rpm is absurd. I see 9500 on a semi-regular basis and all I have is some minor clearancing here and there and bumped up oil pressure. On Series 4 (heavy) rotors.