Has anyone ever done or considered doing an engine swap using a 929 V6 into a 2nd gen RX7?

All comments welcomed...

 

FWD engine in a RWD car?

 

929s are RWD. Like the Cosmo, same chassis.

 

Just like to say im not dissing flamming or whatevering you its just why the hell would you do that? Trust me man the 3.0 and 3.0 supercharged are alright motors but not even the 2.5 klze is a wise choice to swap into them. If that is your last option then go for it but just replace with another rotary

 

How about converting a 1991 Mazda 929S into it's japan counterpart - 2 rotor 13b-tt twin turbo JH cosmo.

 

yeah why would you want to do that? its a heavier engine, and puts out less than a 13BT. plus theres the fact that it would require a lot of work to make it work. i'm not morally against piston engine swaps, but if you were going to do one, i'd go with one that would have a significant power increase over a 13bt, like a lt1 or ls1.

 

Personally I see that as a big waste of time, money, and effort.

Even if you did the JFT swap (Japanese version) that has a turbo you still only have 200hp. Nothing to write home about. Those engines are huge and don't have much of any potential. There is the option of a custom turbo upgrade however, but still.

But why put all that money into that? When you can build rotarys strong and for so cheap.

I should add the point that I am 100% against anything but a rotary in an RX-7.

And as mentioned above by rotoriffic, the KL_ZE... I just got out of my Probe w/ KL_ZE engine project. I saw the kind of money I put into that engine and saw where it got me at the end of the track. That is why that car sits and I found myself a new car with good potential and something that is still not commonly modified in my area.

Also think of how many cars people stick turbo rotarys into. The 13BT and a Chevy 350. Those motors have been stuck into every car in the world I swear. :laugh: Why? Because there is a definate power potential with them.

 

May be of no help but when I was researching for my trans rebuild the Mazda MPV 5speed seemed to have the same trans as the Rx-7 (can't remember if it was the turbo or N/A trans). I am not sure if the 929 shares the same engine or bolt pattern for the trans. Also found out that the MPV engines had lifter problems for years .

I Like my Rx-7 because its well designed. If I were looking for a V-6, I would get a nissan. Like in either of my other 2 cars, Maxima and Pathfinder.

 

it probably would be about as hard as a 20b swap (the 20b mounts may even work), but the dohc v6 motors are not all that great, and if you think the fc is expensive the dohc v6 is twice as much. you would have the only one on the block though, not like all these 20b fc's running around

mike
20b fc

 

some JH Cosmo Luce action. Notice how similar the 929 is. Wish I had the $$$ to convert my 929 to the "real" cosmo luce.

 

Bad idea IMO. It's a very wide engine. Not only is it DOHC (big) but it's also a 90 degree engine (even wider).

And I don't think it even makes 200hp? I'd call it a pretty pointless swap. But, hell, if you have a wrecked 929 and an engineless RX-7 and plenty of spare time, hell it's YOUR car, do it and tell us how well it worked.

 

ewwww those cars are uglyyy.. god no. just put a new rotary back in

 

Well if he has a S4 NA then the swap would give him a much noticeable gain in HP(146-193). 50hp is very very noticeable. Now there are much better engines to swap in, but if we has a spare 929 engine or he just really wants to do it I think he'll get some decent increase from it. Just not as much as if he swapped in a V8. If he already has a TII then I don't have a clue why to go piston

 

stay with a rotary.... hey t Ryde im me Jbush85016 i wanna know if a few of you up there wanna shoot down next friday and hit the track with all of us. we are trying to get all the rx7's that we can to go.

 

Those motors are enormous.

The turbo version makes 200hp, the JFT. Biggest waste of 200hp I've ever seen actually.

 

How the hell does a turbo only give 7hp?lol.

 

Heh.... I'm pretty sure the JFT has 200hp. I don't know all the differences in the two motors....

Yes, these J-series motors would work in an MPV also. And the tranny bolt patter is the same on the 13B's, 20B and J-series motors.

 

how about a toyota 2jz engine. You know, the twin turbo supra engine? (and it's 6speed tranny). just a thought if you really want a piston engine.

 

I don't know about those engines either but that 929 is frikin huge! If only the millenia was rwd. I still plan on getting a millenia s later on, I hear they are very reliable.

 

I've been a Mazda K-series nut for the past 3 years. Those motors are awsome if you ask me. Then the Miller-cycle? That's such a cool concept.

 

A klze is whats in the Mx6 ls right? Thats what we jsut got my GF.

 

Turbo probably sized to make lots of low end torque, which would be what you'd want for a luxury yacht. Restriction at the top end combined with lower C/R can make turbo engines make barely any more power than their N/A counterparts... but WHAT a torque difference!

 

I was only thinking of a more robust and larger powerplant for the swap. I don't want to do a hybrid swap.
If I wanted a toyota 2jz engine I would buy a toyota, so with that in mind I was thinking of the 929 V6 swap to remain within the constraint of mazda only equipment.

It would be similiar to the toyota celica swap which used a toyota tundra V8 engine.

 

The KL_ZE is the Japanese MS-8 (626), Ford Kleif (sp?), Eunos 800 (Millenia), and MX-6. 197hp.

I've got one in my Probe.

 

No, no no no... that is just plain wrong.