Another reason to use OEM thermostats (pic)
 

So I found this site full of all sorts of service manuals from the oldschool rotaries up to the Rx-8. It's run by a guy who is on here. http://foxed.ca/foxed/index.php?page=rx7manual

anyway, I've been reading these when I'm bored (which is a lot lately), and I stumbled across this in the Rx-3 FSM:

https://www.rx7club.com/attachment.p...1&d=1248544721

This just confirms what we all knew. Another interesting thing about OEM thermostats: every single service manual I have looked at, Rx-2, 3, 4, 7, and 8 (both 12A and 13B), has the thermostat opening at 82C/180F and fully opening at 95C/203F--except this one:

https://www.rx7club.com/attachment.p...1&d=1248545342

That's from the Rotary Engine Pick Up, which had one of the only USDM 13B's offered in the 70s. It's interesting how people freak out if their water temps get over 200 degrees F and yet Mazda designed the engine to run at these sustained temperatures for a long period of time.

lol, I don't notice the 3rd pipe on my housing.