GotSpeed?

Will a motor from a '90 RX-7 bolt right in to an '86-'88 RX-7? Sorry if this seems dumb but I know nothing about these cars so I'm looking for some experience/knowledge. I have a chance to pick up this rex in great shape - no visible body damage or rust, clean interior, 5-spd, power roof for......$100!!!!! The motor is toast, previous owner began to tear into it and quit. He was going to have it taken to a junkyard!!! I said if they were going to get rid of it then I would take it. So for 100 beans it's mine but before I go there, I'd like to know what motors will fit the car. I'm not exactly sure what year the blown one is. Guessing around '86-'88. Thanks.

MasteRX

If you are using all of the 86-88 injection and such, then the engine block would fit with one problem, the Oil Metering Pump (OMP). In 86-88s the OMP is mechanical, and in 89-91s it is electrical. So the mechanical OMP wont work on an 89-91 engine. And the electrical one won't work with the 86-88 induction setup. An alternative to this is going with premix. This means mixing two-cycle oil into your gas tank with each fill up.

The other method is by going with the complete 89-91 engine. That means you would be using the 89-91 intake and injections systems. This requires a lot of things. To do this swap you would need:

89-91 engine complete with intake system, Air Flow Meter, all sensors and relays, complete wiring harness, 89-91 guages + trouble lights.

This would be a difficult swap to do. If you are going to do this much work, you might as well do a Turbo II swap, which would require about the same amount of work. Yet another option would be to install the 90 motor and induction, and use a haltech or some other standalone computer with it, but I believe only the haltech can work with the electric OMP.

If you want to keep it simple, just get a ported 86-88 motor, and then you might consider putting the 89-91 style upper intake on it. This would give you as much horsepower as the '90 motor would.

GotSpeed?

Whoa......I had no idea. Thanks for the info.

rx7style

iTrader: (1)

There are so many minor changes and differences between the two engines [I even think the motor mounts are slightly different] that it's just too much work and headache to get set up correctly. You need the correct ECU, harneness, injectors, etc... so it's a big job. It's not "drop-in" if that's what you're asking.

GotSpeed?

Thanks fellas for the input. These motors are so different and I have never messed with one before....lots to learn. Hmm, a guy at work here said he had an extra Corvette motor in his garage!