goldie'srx7

I have a 85 with a 12a can i put a 79 12a in my car, and is there anything I need to do to accomodate this transfer? thanks for help

hornbm

yeah sure you can put the engine in, however the 79 has a thermal reactor, and the 85 uses catalytic convertors. The carb is slightly different as well. So answer your question, you can but realisticly, you can only use the bare block, and bolt everything from the 85 on it.

peejay

Yes you can, as long as you don't have to pass emissions.

https://www.rx7club.com/showthread.p...al#post2807501 explains the differences handily.

peejay

The ACV in the '85 manifold wouldn't be able to direct air to the exhaust ports, though, since the SA engine does not have the air injection passage there under the center intake ports.

The SA carb seems to run better than the later junk. I never understood why Sterling was so horny for making the accelerator pump shot bigger and bigger, until I went from using an '80 carb to an '85 carb. Whoa Nellie, big difference there!

Search is slow as hell lately... here's another link:

https://www.rx7club.com/showthread.p...ns#post2849828

shm21284

Use the 79 carb and intake, its higher flowing and has bigger ports. Trash that 90 lb piece of **** thermal reactor. its a heavy waste of perfect iron.
The 79s had catalytic converters in addition to it's thermal reactor though. Oh, and you can use 85 exhaust headers instead of that reactor. They are lighter and a bit more freeflowing.

Rutnick

I thought it was a heat exchanger and NOT at cat.

hornbm

They did not have a cat, it's a heat exchanger.

shm21284

Woops. looks kinda like one, though.

Ariel

I have a picture of the Heat Exchanger/Catalytic Converter, whatever it is.



It is on my newly bought '79(I'm a newbie), so is it a cat or not? My car has got a new header installed by the previous owner, så I guess the Thermal Reactor is gone - if the box in the picture in fact is a heat-exchanger, can I remove it with no effect on emissions?

thanks


Alex

MosesX605

That's neither a catalytic convertor nor a heat exchanger...

It's a muffler.

Ariel

Oh! Thanks for clearing that up.
That's good news, I guess will replace it with some straight pipe then. The existing pipes look awfully twisted and rusty IMO.


Alex