Would the TII motor bolt directly up in a 79/80 RX. To my understanding it is a 13B four port and I believe the earlier 13B four ports will bolt up directly, right?? Am I wrong on this or what? What it comes down to is, I do not want to do a lot of custom work to a a fuel injected engine into my 80 RX. Also to my understanding, a 13B 6 port you have to do major mods to get it to work. Any info will help and I am pretty sure that I will get corrected if I am wrong also.

 

It's rare for a T2 engine to be called a 'four port' mainly because of the earlier NA four port 13Bs. This is to reduce confusion. Yes a T2 does have four ports, but the generally accepted term for any four port 13B you'll read about here is refering to either a '74-'78 13B, or to a multi-year beast which has 12A side plates and '74-'78 or '84-'85 rotor housings. A T2 engine has low compression rotors and won't make as much power in NA mode with similar porting as an old genuine 13B four port engine will.

To answer your question, a T2 engine will fit in an '80 if the front cover is replaced with anything from '74-'85. Most people seek out a GSL-SE front cover since the OMP better suits the T2 engine. They also try to get a GSL-SE motor mount because it was made with a 13B's extra 20mm of length in mind. Get a GSL-SE oil pan too.

I'm not sure of any carb intake manifold available for a T2 engine. There's plenty around for 13B four port engines though. Hmm, you could try an Atkins supercharger. They make a manifold which fits a T2 engine I believe.

 

Are the T2 intake ports different than other 13b 4 ports? For some reason I thought that they were the same. There is an option you can consider which would resolve the low compression of the t2. You could use 91 n/a high compression rotors.

 

Yes, the intake ports are shaped differently and the bolt pattern is way off.

 

go to mazdatrix's site and check out the racing parts section. there are Weber carbs and manifolds available for every 13B out there, T2 included.

and, yes, i agree that you'd be better off building the motor with high compression rotors because the T2's stock compression ratio will be less than ideal when used without the turbo.