HELP A NOOB OUT, 1979 engine swap
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Joined: Oct 2012
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From: Kettering, Ohio
HELP A NOOB OUT, 1979 engine swap
Ok so i have a 1979 rx7, im looking to swap an engine from a 1985 rx7.. i know that it should fit right in, mount and trans. The only problem im having is the wiring harness. Will it work with everything on the car, or will i have to make my own harness??
What's that smell?
Joined: Jul 2007
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From: Dorset, England
You'll have to reuse the external reg alternator off the '79 but apart from that will swap across fine. You'll also have a beehive oil cooler on that engine but up to you which one you use, although if the front mount is healthy then they are far more efficient.
By the way, if you want to use the beefier alternator then it can be easily done you just have to do some simple mods to the loom.
By the way, if you want to use the beefier alternator then it can be easily done you just have to do some simple mods to the loom.
Thread Starter
Junior Member
Joined: Oct 2012
Posts: 24
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From: Kettering, Ohio
You'll have to reuse the external reg alternator off the '79 but apart from that will swap across fine. You'll also have a beehive oil cooler on that engine but up to you which one you use, although if the front mount is healthy then they are far more efficient.
By the way, if you want to use the beefier alternator then it can be easily done you just have to do some simple mods to the loom.
By the way, if you want to use the beefier alternator then it can be easily done you just have to do some simple mods to the loom.
The 1985 12A does not use the same exhaust manifold as the 1979. The 79 uses what is called a Thermal reactor.
If you can get the altenator and dizzy it would be worth your time to swap out the points style dizzy for the 1985 electronic dizzy. Just a little extra wiring.
It would also be worth it to swap out the 85 beehive oil cooler for the front mount in the 79.
If you can get the altenator and dizzy it would be worth your time to swap out the points style dizzy for the 1985 electronic dizzy. Just a little extra wiring.
It would also be worth it to swap out the 85 beehive oil cooler for the front mount in the 79.
Thread Starter
Junior Member
Joined: Oct 2012
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From: Kettering, Ohio
So what do i do after i remove the oil cooler, just bypass it? and put the mounts on? The ones on the engine i have right now look quite healthy. The engine only has 125, with bad apex seals sadly.. I really wanted to rebuild it, instead of replacing it, but the engine costed me less than the gasket set would have. :|
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So what do i do after i remove the oil cooler, just bypass it? and put the mounts on? The ones on the engine i have right now look quite healthy. The engine only has 125, with bad apex seals sadly.. I really wanted to rebuild it, instead of replacing it, but the engine costed me less than the gasket set would have. :|
Joined: Mar 2001
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From: https://www2.mazda.com/en/100th/
they made a bunch of small changes between 79 and 81
in 81 the apex seals get a corner piece with less leakage area, the spark plugs move closer to the combustion chamber, and this allows them to run it leaner so it allows the cat.
its partly why the 81+ models were rated with slightly better mpg
in 81 the apex seals get a corner piece with less leakage area, the spark plugs move closer to the combustion chamber, and this allows them to run it leaner so it allows the cat.
its partly why the 81+ models were rated with slightly better mpg
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