Sooo i was wondering, how much trouble would it be to put a 93 rx7 motor into my little FB?

 

Depends how much you know about fabricating and welding.

The mounting system is completely different from and FB and FC/FD engine.

The FB has front mounts, the FC/FD engine has side mounts.

 

amazing how the same 'ol questions get asked over and over again. u'll need to change the front cover to gain the front mounting point. then there's the front mount itself. then there's the question of what u plan to do for induction. carb will be the simplest. FI will probably be more of a headache for u depending on ur mechanical ability/knowledge to do the swap. u could use the entire engine harness and ecu or go stand alone. try searching, u may find some that have already attempted this.

 

For the time and effort, you should just get the FD. It would be kind of awesome if you did it right tho.

 

He should just put a TII engine in his FB.
The TII engine would be easier to install.It's been done.So I've heard.(brapp,brapp!)