I have a 1972 RX-2 with the original twin-dizzy engine, still equipped with working air pump, thermal reactor, afterburner pipe, and a multitude of anxient smog sensors, air injector nozzles, and relais.



In a nutshell, the smog pump feeds the system with air all the time, and the little helpers (have no idea if they all work properly) direct the air into the exhaust for afterburning, or, in case of decceleration or high speed, into the thermal reactor for cooling.



The schematics of this system is mindboggling and all of the spaghetti hoses in the engine compartment drive me nuts. None of the helpers can be replaced, if malfunctioning, and the stuff is so weird and outdated that it would be crazy to try to keep (or even get it) running forever.



Hence, although I want to keep the car as original as possible, the crude and overcomplex smog system has to go. I wonder how I should proceed.



I understand, if I unhook the smog pump, the thermal reactor can overheat. So my guess is that I have to replace the thermal reactor with a good exhaust manifold (I have a very good one already), at which time I can remove the smog pump as well. But since there seems to be a lot of stuff connected to the intake manifold as well, I might have to change that too and remove all of those control valves from the carburetor as well.

Any thoughts on how to proceed? What do I need to change, what do I need to plug? What intake manifold should I buy? What do I do with the vapor hose coming from the fuel overflow canister in the back?

Has anyone disabled/removed the smog system without going all out and popping in another engine?

Thanks!

Hi Bernard! My R100 has all the old smog plumbing in it also with most of it not working. The car runs well with no adverse effect that I can tell. It just not pass the smog inspection....at all! If you want to keep the car as original as possible and if the car is running well...leave it alone.

It's not uncommon to remove the rats nest on the FB cars and they've got it down to a science. Bolted to the side of your intake mani is the valve body for AAB valve and other stuff. This can be removed, the resulting hole covered, and the smog pump can be shelved. None of the changes are permanent, and you get a simple carburetion setup.