What setup would be a "better" choice? About two years ago I built my 13b half bridge. It has been a fun build/learning experience considering it was my first rotary rebuild. Today I was bored looking at my spare 12a thinking what to do with it, like a blank canvas. Would a pport 12a make more hp with supporting mods? What would be lost going back to a 12a from a 13b? I know it sounds weird but looking back at the 13b build there was a lot more I should have done when putting it together. Thats part of learning, I was in a hurry to get the car back on the road and half assed some things. Just looking for other ideas of what I can do with it.

 

I would not do anything with a 12A. Good running 12As are gold nowadays. I'd trade my left nut for a good running 12A so I can get my '81 properly finished (but not righty, he's my boy)

Convert the 13B to full bridge and use N/A FC internals. The 2mm apex seals will be RPM-friendly and kind to the rotor housings, and the 12-pin rotor gears will be kind to the stationary gears.

 

I have 2 good 12as right now, one is minty. Like less than 10k miles. I feel bad letting it sit there.

 

From what Peejay says it sounds like you could use it to fund your standalone ecu and throttle body for your 13B.

 

Yeah I could. But its a spare for the day the 13b braps its last brap. Hopefully I rebuild the 13b before anything bad happens.