I was wondering what the most popular car is for a rotary engine swap. Also I was wondering what is the light car that can have the 20b or 13b put in it. What is the easiest swap for a rotary engine?

 

Rotary engines have been swapped into nearly everything. It is hard to say the most popular, but early Datsuns were quite a common swap for a while. Now that these cars are hard to find we are finding VW Bugs, older BMWs and really anything you can think of.

Personally I've always thought a mid 90s Corvette with a 20B would be quite impressive.

 

Easiest swap for a rotary engine would be a car that is originally powered by a rotary like the Cosmo, Rx-7, Rx-8, Rx-5, along the lines of that. I'd have to take a guess here but I'm thinking the SA/FB First Generation Rx-7 is probably the lightest and Ive seen 13b-t, 13bre, and a 20b engines stuffed into one. It would be ridiculous to put a 20b in a car as light at the FB