After many years of owning rx7, i have never broken or built and engine. Now i think it time to rebuild a 13b in my free time. I recently tore apart a spare engine that is in great condition, and i think im going to go ahead and rebuild it myself. I am planning to have the rotors side cut, rotating assembly balanced, and street port my irons with the mazdatrix template. I cant help but want to scallop my rotors at the same time, because im in there and why not is what im thinking. This build could go two ways, N/A fuel injection or 6 port turbo( probably low boost).. im leaning more towards N/A

i just want my fellow members opinions, i know what scalloped rotors do, but should i on my street port 13b s4 n/a?

 

small picture, if its your first engine, keep it simple, and just built a good stock engine with the most new stock parts you can

big picture, you can't port the 6 ports very much, especially if you need to pass an emissions test, but you can scallop the rotors and that could add some port area without changing the timing much, which is good.

bigger picture, scallops are good, usually with pasta, in some kind of buttery white sauce

 

Ive been debating weather or not to experiment with my first rebuild (s5 6port NA) and having the rotors scalloped and change nothing else. I thought in theory it'll act like a more expensive streetport/bridge and I contacted goopy asking about it and they basically said if I wanted something that was in between to go semi pp.

I've decided to take goopy's word and Im going to begin saving up for a semi pp build after I build a basically stock motor. However Im still interested in the idea of scalloping just from the lack of recorded info on here, especially for NA power. I support you if you have the money to experiment.

 

Im going to get them done on mostly stock(ported) engine and post a dyno. Ill post my results this summer!

 

What shops do this?

 

Goopy, defined autoworks, and clm if you're on the east side of the US

 

There is also a shop called "B2A" in socal that i might contact since im local to CA, Also another guy on Instagram called " rotary_science ". Seems to range in price from 300-400$, Then balancing the rotating assembly cost about 200-350$

 

Any updates?