I heard of some RX-7's that run N/A 4-rotor rotorys that pump out 710HP

Now, I wanna know where I can get one!

 

 

 

well ill just tell u this, a plug change is a little over $2000. now thats just spark plugs. so do u still wnat one?

 

To my knowledge there's not been a 4-rotor FD until fairly recently when people've started throwing 12A bits together to make 'em.

Although...

I talked to Jim Downing's engine builder when I saw them at the ALMS race at Elkhart Lake. They have an R26B in the car... he offhandedly commented that if you paid Mazda $50K they'd build another one for you.

I can't help but ponder that. No, I don't know exactly how to get it to fit, especially not with the variable intake trumpets, but... dammit, that would be cool. I suspect that if you hammered the firewall a *lot* and used a Hewland in-tunnel box you could have enough length to fit it... passenger footwell might get kinda warm, but oh well.

 

Yup, see here. https://www.rx7club.com/showthread.p...&highlight=26b

 

Bah, you had to comment on the boring part of my post. Knew about the Scoot car, and can recall one other 12A based 4-rotor car... just don't know if anyone has done them before recently. I don't think so, because there'd be a lot of people fawning over it, but...

 

http://www.4rotor.com/

 

I was proving your point for you. You should be thanking me

 

Yeah, but the more *FUN* point was the idea of cramming an R26B into an FD somehow.

I think it could work. Just have to... ah... massage the firewall / trans tunnel with a sledgehammer. And back it with a Hewland or some other tranny that is short enough to put the engine back that far. Could work.

Though "massaging" might be harder than just... oh, I dunno, cutting a hole where the engine has to go and building a new chunk of firewall/tunnel around it. Passenger side might lose quite a bit of footroom... and it might be kind of hot for their feet too... but hey, what price hath fun?

Though the trick would be figuring out how to get the variable length trumpets to fit in the engine bay...

 

Yashiro Eng. in Japan makes a 4 rotor WITH a one pc. E shaft !! ( thats the eng in the Scoot FD BTW.. ) i've got pics of the eng on display at a japaneese auto Salon show

 

how much is it and lets see that pic or do they have a website

 

How in the hell would a one piece e-shaft actually *WORK*? Mazda made the R26B's shaft 3-piece because that's the only way they could get the extra pair of stationary gears in. One piece seems like you wouldn't be able to take the stationary gears off at all...

 

i want a quad rota, quad turbo

lol

 

cant someone just fab up a cheap e shaft and let us stack our engines like legos? doubtfully this will happen

 

That's been my thought.

My 12A is being rebuilt soon (with a semi-PP setup) and I can't be bothered to pay $160 for an automatic counterweight so I can fit it into a beelte. So I was going to buy a 2nd 12A and join them end-to-end, thus removing the need for the counterweights

With a proper tune-up, this should see around 550-600Bhp

Oh yeah, and it'll be going in the rear of a beetle with a motorbike front

 

Oh my.

 

I wonder why people are building 12a 4rotor engines instead of 13b 4 rotors. Now I want to buld a 4 rotor

 

12A housings are shorter than 13B ones, so between modifying the normal housings to fit stationary gears and that, it's only a couple inches longer than a 20B, whereas with 13B housings you add a couple more inches on top of *that*.

 

OK I got the length issue (and the RB26 isnt that long you can fit them in R32 300z's). So what is the biggest stopping point to actually putting together a home grown 26b? the eshaft?

 

Well, the R26B *is* pretty long. The 1st and 3rd intermediate plate are the same width as the 20B's thicker plate. I have pictures I took of the one Jim Downing has.

Oh... wait. RB26. RB26 is a Nissan I6, R26B is the LeMans type Mazda 4-rotor. Big difference. I'd be really curious to see any R26B squeezed into... actually, pretty much anything. They're rather rare.

Anyhoo. The big barriers are the same as putting together any 4-rotor... e-shaft and the intermediate plates with the stationary gears.

 

im sure if it was built, we would MAKE IT FIT, no matter what the cost

 

Oh, sure. I just figure that it would fit better if the engine were smaller per displacement. I've no doubt that you could fit an R26B into a 3rd gen RX-7 if you tried hard enough and made enough compromises... I just want to fit an equivalent custom engine in with less hard work (well, less hard work cramming it *IN* anyway) and fewer compromises in design.