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Index > Engine/Drivetrain > Thread: Which engine for my truck
Thread: Which engine for my truck
Mrsuperbuckets


Newbie
Posts: 2
posted May 27, 2016 08:00 PM

Which engine for my truck

HELLLLOOOOOO everyone! This will be my first post here "So exciting I know". I just purchased a 1974 REPU, and lets just say the engine, and trans are in less than *COUGH* useable condition so I was curious which rotary engine would be a good swap. I was thinking that a six port RX-7 engine, and five speed would be a good candidate, and maybe put a 80MM turbo for the best balance of power, and street friendliness. I would like everyones opinion on this matter!!
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Brad


Rotorhead
Posts: 1665
posted May 28, 2016 01:10 PM
Edited By: Brad on 28 May 2016 13:21

6 port 13b from a 2nd gen rx7 will be the easiest to find. You can use the tranny too but you'll need to move the shifter forward. It has been done there are instructions on the internet possibly on this site.. Or you can just use a trans from a 79-80 rx7 they bolt up and the shifter is in the right spot, don't need to cut the floor. But you'll need to make a small adapter plate for the trans mount, there's a pic of it on this forum and in the Gallery.

       
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mrsuperbuckets


Newbie
Posts: 2
posted May 28, 2016 07:22 PM

The reason I liked the 6 port is because the better low end power, and better mpg over the 4 port. Also the EFI is going to massively improve drivability. You wouldn't happen to know if the 6 port rx-7 motors use the same mounting points as the 4 port in our REPU trucks? I can easily make points, but if I can use stock mounts that would just make me happier!
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Mazdamark


Hauling
Posts: 138
posted May 31, 2016 11:45 AM

2nd gen 13b engine mounts are on the center iron and the oil pan. I believe the 6 port 13b motors used in the 1st gen 84-85 GSL-SE use the same mounting on the front cover our trucks. If you go with a 2nd gen engine, you can swap out the front covers from the earlier motors.

       
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Brad


Rotorhead
Posts: 1665
posted May 31, 2016 05:26 PM

Use a front cover from 74-85 rotary, all the same bolt pattern. Not sure about pre 74, but its not likely you'll find one of those anyways.

Atkins Rotary sells the front cover.
http://atkinsrotary.com/store/79-85-12A-Rx7-Reconditioned-Front-Cover-1480-10-600C.html

       
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exzyled05


1st Gear
Posts: 37
posted August 03, 2016 11:26 AM

hey Brad, sorry to interrupt the topic but if you have some time I'd like to chat about the camden sc setup and possible platforms for my 77

       
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Brad


Rotorhead
Posts: 1665
posted August 03, 2016 11:43 AM

quote:
hey Brad, sorry to interrupt the topic but if you have some time I'd like to chat about the camden sc setup and possible platforms for my 77



I've never owned a supercharger. Why not call Atkins?

       
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exzyled05


1st Gear
Posts: 37
posted August 03, 2016 01:41 PM

I did get ahold of them but didn't have much time to talk because of work and need a little longer to talk about the setups. my biggest questions are: would it be better to run the original 13b and swap out low compression rotors or would I be able to use a TII core with the old front cover so I can maintain the current motor mount. would the tII allow more hp off the same setup over the old 13b. would a full BP still work alright, and is it possible (do you think) to get over 300hp. I understand that you don't have a supercharger but you are more knowledgeable than most and I would appreciate your insight.

       
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