Okay this is a rumor i heard form a locall rx-7 guy. He claimed he shaved down 13-b housings and put the 12-a rotors, installed 12a coils and distributor and made 300hp non turbo?? in a 91 motor. are the 12-a rotors bigger than 13b rotors? can this be done or has anyone done it. he also told me to just put 12a coils and distribiter into my stock 13b and my power and my throttle response will dramatically increase. Is this true? sorry for the bad grammer

 

absolute BS!

 

Ha i knew it what about the distribiter and the coils from a 12a in a 13b any diffrence?

 

Seriously, WTF. Even if it was possible (its not) it wouldn't work like he said. Also, I doubt any 12A parts will work better than the stock FC parts.

Also, your almost at 25K posts, Ted!

 

Distributors are old technology and are inferior to the stock FC ignition.

 

thanks

 

It's been done before, but it's not practical.

You can do it if you're building a 12A. Since alot of used 13B housings have damage at the edges of the housing, and are cheaper than new or good condition 12A housings, you can cut them down on a milling machine, and re-create the coolant seal groove in the housing with a CNC machine. You also get a free large exhaust port, but you aren't going to make 300hp.

Look up DLIDFIS in the first gen section, it's a method of bypassing the distributer on the leading ignition.

 

im with box man it has been done just not common

 

That sounds like a lot of work. I won't be trying it in the near future.

 

I call BS on the original poster's buddy. 300hp on an n/a two-rotor does not happen.
Plus, he said 12a rotors in 13b housings. It is my understanding that the 12a rotors would be too small in 13b housings to really make an engine, let alone one that would do anything.

 

You can make over 300hp on an NA rotary, with a Peripheral Port you can get significantly more than that even.

Distributors can be made to work fairly well, but there's nothing like individual computer controlled high output coils.

 

But it has?

 

Over 300 HP has been done with peripheral ported 13Bs. It's expensive (lots of custom fab), noisy, gas-guzzling and pollutes like mad though. And at the low rpms you don't get any extra power.

The LeMans winning 787B uses a 4 rotor peripheral ported engine. They said that they chose peripheral porting instead of a turbo for reliability reasons.

 

me either just a thought.