I'm thinking on changing engines ,in my 85' GSL, from a 12A to 13B engine out of an 85' GSL-SE. I'm looking for some information on what changes will need to be made to make this engine swap work. I have found a good deal for a 6 port SE 13B, w/transmission, and a racing beat exhaust. I have already upgraded the suspension for this rx7, from the standard suspension, found in a GSL to an SE suspension(LSD,brakes,strut towers,etc). Now I might as well change the engine to a 13b, instead of rebuilding the 12A in my RX7, which has started to lose compression

Rebuild the 4 port and go turbo, thats what I think Im gonna do.

Not to long a go I was considering rebuilding the 12A, with 2mm Apex seals, and adding a turbo. Problem is I haven't had any luck finding a turbo kit.

take both engines apart. use the 13Bs rotors, housings and eccentric with the 12As irons. port, polish if you wish and get a carb set up.

^ yep.

[quote name='DJ Rotor' date='May 12 2005, 11:23 AM']^ yep.


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I second that ^

[quote name='treceb' date='May 12 2005, 09:36 AM']take both engines apart. use the 13Bs rotors, housings and eccentric with the 12As irons. port, polish if you wish and get a carb set up.


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OK, so I use the 13Bs rotors, housings and eccentric with the 12As irons. I need to know what will need to be done so I can install the 13B when its ready to be put back into the car. I have the transmission that was running with the 13B before it was removed, I also have the 13Bs oil pan. Do I have to change the motor mounts or will everything line up if I just interchange the plate from my 12A?

You can buy that overpriced hunk of iron from Mazdatrix or just bend up your own front elephant ear mount.....

Or slot the trans mount 1 inch and use the 12A engine mount. That what I did and it works perfect.



Read carefully... Weight transfer... By doing this you just mover 200lbs 1 inch towards the rear of the car. this helps to move the center of gravity more towards the center of the car.

[quote name='ArmyOfOne' date='May 14 2005, 09:49 AM']Or slot the trans mount 1 inch and use the 12A engine mount. That what I did and it works perfect.



Read carefully... Weight transfer... By doing this you just mover 200lbs 1 inch towards the rear of the car. this helps to move the center of gravity more towards the center of the car.


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Does moving the engine back an inch have any affect on everything else, like the transmission, lining up? What changes will have to be made for the 13b wiring?