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Back in the early 1980's I bought my first RX-7. A 1980 gold GS. It had a bad motor and I swapped a 1982 engine. I had the sake issue with the square port. I fixed it with JB Weld putty. It worked great. One of the strongest engines I've had.
Knowing what I know now, it probably would have been best to swap a 1982 intake. Since you have a header, I'd find the correct engine intake and just block off the ACV on the manifold with a block off plate.
How did you do the JB weld putty, did you have to pull the motor out?
And how much putty did you go through blocking up the port?
How did you do the JB weld putty, did you have to pull the motor out?
And how much putty did you go through blocking up the port?
I didn't pull the engine or exhaust manifold (thermo-reactor). I just worked the putty till it was like silly putty. Not sure how fast the working time is with this stuff nowadays. You don't want it to flow. Engine should be cold. Let it set a good 24 hours afterwards. I'm not sure it's the best solution. Back then I didn't know any better. My concern now would be getting parts broken off and in to the rotors if that's even possible.
I didn't pull the engine or exhaust manifold (thermo-reactor). I just worked the putty till it was like silly putty. Not sure how fast the working time is with this stuff nowadays. You don't want it to flow. Engine should be cold. Let it set a good 24 hours afterwards. I'm not sure it's the best solution. Back then I didn't know any better. My concern now would be getting parts broken off and in to the rotors if that's even possible.
I'll have to have another look around for a manifold maybe.
The guy I spoke to reckons youd be very unlucky for the putty to break off and end up in the rotor housings, maybe that's why he says to use silicone first that and to save on using so much putty.
I ran into a similar situation with my original all stock early build date 1979. Based on my car, I think the OP has an early 12A and not a hybrid.
Here are pics of my engine I'm cleaning up. I bought the 1979 intake gasket as shown in one pic and it will not work. Even thought the intake will cover the square port, the gaskets needs to include this port. I have ordered the 1981-1985 and will enlarge the gasket for the tall intake ports. These ports are factory.
Last edited by KansasCityREPU; Jul 7, 2017 at 07:50 PM.
My early build 1979 looks exactly like this engine. The intake does not cover the port entirely. I can say with 100% certainty that the port on early RX-7 where like this and the intake did not cover them. I've been debating if I should fill the port or not. https://www.rx7club.com/1st-generati.../#post12233642
