Will a 12a bolt up to an S5 manual tranny?
10-22-03, 10:45 PM
#1
...94% correct.
Thread Starter
Will a 12a bolt up to an S5 manual tranny?
I've had too many problems with my RX7 and am QUITE tired of it sitting...been sitting for two years...I've stumbled across a complete 5K miles 12a than I can pick up for $500. I've tried sticking an S4 13b into my S5 but I no longer have all the components that I need to make it work propperly. If I get the 12a in and it works then all my S4 components (two entire cars worth) will be fore sale.
I need to know if the 12a will bolt up to the 13b tranny. Now, keep in mind I'm not in it for speed and power. My supra project will handle the speed and power. I want a car that will start EVERY time I turn the key. I want simplicity. Most of all, I want cheap. If any of you know if they'll bolt up or what all I need I'd greatly appreciate it.
I need to know if the 12a will bolt up to the 13b tranny. Now, keep in mind I'm not in it for speed and power. My supra project will handle the speed and power. I want a car that will start EVERY time I turn the key. I want simplicity. Most of all, I want cheap. If any of you know if they'll bolt up or what all I need I'd greatly appreciate it.
10-22-03, 10:50 PM
#2
FD > FB > FC
Yes it will bolt up BUT, you going to have one hell of a time trying to mount that thing in you FC. The FB engines mounted on the front cover, not the intermediate housing the the FC.
Since the 12a is a carb, why dont you put $500 dollars and save for a little bit and get a nice carb for the S4 13b?
Since the 12a is a carb, why dont you put $500 dollars and save for a little bit and get a nice carb for the S4 13b?
10-22-03, 10:55 PM
#3
...94% correct.
Thread Starter
wouldn't happen to have a pic of what the mounts are like, would you? I'm fairly certain I could do it but...
I need transportation now. Work's about to get started on my supra so funds will be directed towards that. I don't know...I guess I'll have to wait and see.
Would I have to use a full 12a clutch and flywheel? Or will one of the 13b flies bolt up and run fine?
I need transportation now. Work's about to get started on my supra so funds will be directed towards that. I don't know...I guess I'll have to wait and see.
Would I have to use a full 12a clutch and flywheel? Or will one of the 13b flies bolt up and run fine?
10-22-03, 10:57 PM
#4
Old [Sch|F]ool
I have grave doubts you could do it. The pre'85 motor mounts are exactly where your existing P/S rack is. That's why Mazda went to the center plate engine mounts in the first place.
As far as clutches go... not that it particularly matters, but all N/A rotaries have the same transmission input spline size. What that means is, you use the clutch that matches your flywheel. There are three N/A clutches, 215mm ('74-82), 225mm ('83-up), and REPU.
Actually, I have a S5 clutch pressure plate on my '85 12A. They're both 225mm.
As far as clutches go... not that it particularly matters, but all N/A rotaries have the same transmission input spline size. What that means is, you use the clutch that matches your flywheel. There are three N/A clutches, 215mm ('74-82), 225mm ('83-up), and REPU.
Actually, I have a S5 clutch pressure plate on my '85 12A. They're both 225mm.
Last edited by peejay; 10-22-03 at 11:01 PM.
10-22-03, 11:05 PM
#6
Old [Sch|F]ool
Argh... brain fading. I meant R/P, not P/S.
IN a nutshell, the only way to do it involves lots of fabrication one way or the other. It'd be a lot harder than finding a 13B that is designed to fit an FC.
I have a running 12A and a dead FC, if it were worth the while I'd have a 12A-powered FC. I've been known to do crazier swaps.
IN a nutshell, the only way to do it involves lots of fabrication one way or the other. It'd be a lot harder than finding a 13B that is designed to fit an FC.
I have a running 12A and a dead FC, if it were worth the while I'd have a 12A-powered FC. I've been known to do crazier swaps.
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10-22-03, 11:21 PM
#8
Old [Sch|F]ool
Nope.
The easiest way I can figure would be to make an oil pan spacer about 1/2" thick (lots of welding, *lots* of milling) that has ears that the stock FC motor mounts can attach to. Of course a custom oil pan would also be needed... hell it could be incorporated into the spacer. Fabbing the oil pan would be trivial.
Or you could get a FC center housing, weld up the coolant O-ring grooves, have the housings machined flat, and assemble a 12A engine around that. If you made a new LIM you could even keep the 13B's fuel injection. However that is kind of defeating the whole point of the swap, which is *not* having to spend money.
The easiest way I can figure would be to make an oil pan spacer about 1/2" thick (lots of welding, *lots* of milling) that has ears that the stock FC motor mounts can attach to. Of course a custom oil pan would also be needed... hell it could be incorporated into the spacer. Fabbing the oil pan would be trivial.
Or you could get a FC center housing, weld up the coolant O-ring grooves, have the housings machined flat, and assemble a 12A engine around that. If you made a new LIM you could even keep the 13B's fuel injection. However that is kind of defeating the whole point of the swap, which is *not* having to spend money.
10-22-03, 11:27 PM
#9
...94% correct.
Thread Starter
pretty much NOT the cheap way...lol. I found a pic of the 12a mounts...yeah they're right in the damn way...
What about building a wrap-around type mount that will bolt up at the stock 12a point then extend to the 13B mount points? I'd be easy as hell on the driver's side but I can see it being a problem on the pass side...
What about building a wrap-around type mount that will bolt up at the stock 12a point then extend to the 13B mount points? I'd be easy as hell on the driver's side but I can see it being a problem on the pass side...
