3rd gen motor in a 2nd gen body??
11-09-01, 10:45 PM
#1
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3rd gen motor in a 2nd gen body??
I have a 1989 N/A and i'm looking to drop a 3rd gen motor in it. Is it possible to do this project? I know i would need the motor, wire hareness, tranny, turbo and intercooler. Am i missing anything?
11-10-01, 12:14 AM
#3
Former Moderator. RIP Icemark.
Originally posted by RxSeven1
money
money
and motor mounts for a 20b
and an ECU
and a knock sensor
and a throttle cable
and a boost gauge
and a AFM
and a brake booster hose from a turbo
and a custom down pipe and exhaust
and lots of money
You would be much better off selling the car and buying a T2 or FD.
Last edited by Icemark; 11-10-01 at 12:38 AM.
11-10-01, 02:35 AM
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why is it a bad post? I can get all the necessary components from a whecked 3rd gen rx-7. I just want to know the possiblities and which parts i will need. Thanks Icemark, will the motor fit perfectly onto the body with the 20b motor mounts?
11-10-01, 10:31 AM
#6
Two things -
Yes it can be done. Check out my conversion here -
www.marx7.org/members.asp?gcoe
follow the tiny REW link at the bottom of the page and the link on the next page.
I did everything except some machining on the block, by myself. I used the stock computer (initially), stock intercooler (3rd gen), a 3 in downpipe and some custom intake stuff. The only exhaust fabrication required was a 6 inch gap from the down pipe to the catalytic converter. I used my stock radiator and never see temps above 188 degrees except in the blistering summer and it wasn't that much more. It's bigger than the 3rd gen (by a little). The big thing is the wiring. You need to know what you are looking at. The motor mounts were easy. I'm not sure how well the cosmo motor mounts fit on the passenger side of the motor. I took the block to a machine shop and had them bore out the holes on the intermediate plate that would be on the 2nd gen for the motor mount and modified a 2nd gen pan to fit on the motor. I welded an extension on the drivers side mount.
The second thing is -
It is not worth it if you are going to put a big turbo on the engine and run a haltech or run the twins in parallel. I did my conversion because I love the sequential setup. You can easilly build a 2nd gen motor with 3rd gen parts (the ones that in the end make it better) and slap a huge turbo on that without worrying about the radiator plumbing or motor mount issues of a 3rd gen motor. I spent about 5 grand in the end for everything including some suspension mods that you may or may not need. You will need a TII drivetrain which I had lying around that can add another $500-1000 depending on quality and where you get it. In the end it's up to you and it's your money but that's where I stand and here's what I say everytime someon asks me about the project and if I'm going to put a big turbo on it:
"That would defeat the purpose and efforts of my project!"
Yes it can be done. Check out my conversion here -
www.marx7.org/members.asp?gcoe
follow the tiny REW link at the bottom of the page and the link on the next page.
I did everything except some machining on the block, by myself. I used the stock computer (initially), stock intercooler (3rd gen), a 3 in downpipe and some custom intake stuff. The only exhaust fabrication required was a 6 inch gap from the down pipe to the catalytic converter. I used my stock radiator and never see temps above 188 degrees except in the blistering summer and it wasn't that much more. It's bigger than the 3rd gen (by a little). The big thing is the wiring. You need to know what you are looking at. The motor mounts were easy. I'm not sure how well the cosmo motor mounts fit on the passenger side of the motor. I took the block to a machine shop and had them bore out the holes on the intermediate plate that would be on the 2nd gen for the motor mount and modified a 2nd gen pan to fit on the motor. I welded an extension on the drivers side mount.
The second thing is -
It is not worth it if you are going to put a big turbo on the engine and run a haltech or run the twins in parallel. I did my conversion because I love the sequential setup. You can easilly build a 2nd gen motor with 3rd gen parts (the ones that in the end make it better) and slap a huge turbo on that without worrying about the radiator plumbing or motor mount issues of a 3rd gen motor. I spent about 5 grand in the end for everything including some suspension mods that you may or may not need. You will need a TII drivetrain which I had lying around that can add another $500-1000 depending on quality and where you get it. In the end it's up to you and it's your money but that's where I stand and here's what I say everytime someon asks me about the project and if I'm going to put a big turbo on it:
"That would defeat the purpose and efforts of my project!"
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