I need a new motor for my car its a 93 rx7 and the only engines any one seems to have is cosmo motors the 13b re does anyone know what modifications i need to get this engine into my car.

 

It takes a good amount of work to get a Cosmo motor in there - don't bother.

There's a ton of ways to go - get a Mazda reman engine for around $2200-2400, get your motor rebuilt by Rotary Resurrection, etc.

The JDM used motors are a real potluck - I'd only go that route if you were prepared to rebuild it if push came to shove.

Dale

 

As Dale said, there are options from Mazda remans to rebuilds by several different vendors. Please read the engine rebuild section in the FAQ thread and use the search function please.