Thanks! The 7's frame needs some fabrication for the 8's subframe since the bolts dont exactly line up.

 

is it even close? i would expect them to be completely different

 

Doesn't the 8's engine sit a lot farther back than the FB?

Like doesn't the front of the engine on the FB have to sit right about the front axle?


Interesting thread.

I like how you removed the engine from the FB. Just strut towers, sub frame, some innocuous wires and lines and down it goes.

 

its the easiest way, subframe can stay in too

 

No...............Is not even close that is why i am looking to get the fc motor mounts 2 fit on the reny but with the reny being shorter and cause of the oil pan it wont be easy.I have to keep the reny front cover to keep most of the accesories so i dont have that many options.I have to start a thread with some pictures with the trans setup and stuff but i have been working 2 many hours so free time is a luxury this days.

 

Hi all! So I did some more measuring today and the frame rail thickness and subframe attachment to strut mount height are waaaaay off from the two cars. I am up for some fabrication but will have to think smart and easy on how to mount the 8's subframe to the FB. Any ideas or help would be much appreciated. The measurements are below.

FB Strut to Subframe Mount distance ~ 18"
FB Frame Rail thickness - 3 3/8"

RX8 Strut to Subframe Mount distance >10"
RX8 Frame Rail thickness- 3 5/8 inches

The subframe bolt distances are different in separation and width across the frame. The strut mount angles are also different. I may transplant the 8's fender well and strut mount into the FB which may leave the FB sitting like a monster truck. This will be interesting indeed.

 

how about making a subframe that holds the Rx8 engine, while bolting into the FB chassis?

 

well, obviously, anything is possible. i knew a guy that once grafted the front of a Z32 300ZX to the front of his FB in order to run the V6TT when he felt he was done with 13Bs. there's no reason why you couldn't try something similar with the Rx-8 if that interests you.

that said, Ken Scheepers' car was the only one (of 3 that i'm aware) that shared these kinds of details of how he did it. 1979 RX-7. naturally, this is the route i would take.

outside of that, i would tend to agree that a custom subframe would be best.

 

Hi everyone! I'm sad to tell you that I decided to cancel the project. I will be selling the RX8 ASAP. The reasons for this are the suspension mounts are too different, the fuel tank is incompatible, and I am out of time. While having the skills, materials, and tooling capable of doing the project, I have to go back to school in a month and the car cannot stay at its current location. I appreciate all the support from everyone, helpful research, and knowledge. The RX7 will receive its 12A once more and I will drive that till rebuild time. I look forward to getting the 7 back on the road inside of the month. Take care and remember to never say never, try trying.

 

Glad you decided to cancel this. The renny is kinda lame. Getting the 12A back in there should go quickly.

 

sorry to hear it. it really sucks that you just bought the damn thing and now you're going to be in a rush to get rid of it, but i suppose you already know that. good luck with it.