16C rotary
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Joined: Oct 2003
Posts: 500
From: I don't really exist ...
i'll be damned if i can remember what the source was [and it was so long ago that i was not mature enough to xerox (or steal 
) the source], but i recall reading that the "A", "B" designations came from the seal types that the engines used, as heretic briefly mentioned the "newer" style 12As were actually 12Bs internally. the 13B Renesis totally threw me for loop in it's designation, but i guess since we must attach "Renesis" to it in order to distinguish it from the older 13Bs, it can't get mistaken. hopefully someone else heas read the same and can furnish a source or add more details.
by the way, thanks heretic, rotor width was good info i've never received on the 15A.
by the way, thanks heretic, rotor width was good info i've never received on the 15A.
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Joined: Jun 2004
Posts: 524
http://www.der-wankelmotor.de/Motoren/Moto.../mazda_15a.html Sprechen Sie Deutsch?
Here's a "big block" rotary: http://www.der-wankelmotor.de/Motoren/Moto.../mazda_21a.html
Here's a "big block" rotary: http://www.der-wankelmotor.de/Motoren/Moto.../mazda_21a.html
Senior Member
Joined: Jun 2003
Posts: 1,430
From: Stacked outside you're trailer door
I dont care what they do so long as some day they bring us another nimble, sexy, boosted, rotary engine platform. AKA 4th gen Rx7.
Anyone else notice that all the rumors and spy shots of the "next gen Rx7" just kinda disappeared?
Anyone else notice that all the rumors and spy shots of the "next gen Rx7" just kinda disappeared?
Thread Starter
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Joined: Jan 2007
Posts: 115
well i heard a while ago that atkins was working with mazda to develop a turbo Renesis, for the rx8. but they were having prolems with the new sides seals the the motor used.
in may Sport Compact Car had an artical on the Kabura, which is rumored to be the next rx-7.
in may Sport Compact Car had an artical on the Kabura, which is rumored to be the next rx-7.
Senior Member
Joined: Jun 2003
Posts: 1,430
From: Stacked outside you're trailer door
Originally Posted by kuhnke' post='878783' date='Jul 27 2007, 03:37 PM
well i heard a while ago that atkins was working with mazda to develop a turbo Renesis, for the rx8. but they were having prolems with the new sides seals the the motor used.
in may Sport Compact Car had an artical on the Kabura, which is rumored to be the next rx-7.
in may Sport Compact Car had an artical on the Kabura, which is rumored to be the next rx-7.
Thats been the rumor for years. Its all just hearsay.
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Joined: May 2002
Posts: 22,465
From: California
Originally Posted by toplessFC3Sman' post='878481' date='Jul 25 2007, 12:05 PM
yea, there was a 13A, but its pretty rare. I dont get the "C" designation either... id think either A since its the first 1.6L engine, or "B" since it would be based off of the 13B renesis. At this point though, it needs to be significantly lighter and more compact as a whole package than a similar-power piston engine, be it an I4, V6 or V8, because beating those in fuel economy isnt going to happen. The rest of the car will need to be pretty lean to keep the weight down, and direct injection is a must, not only for power but emissions now too. Also, with sufficient reinforcement around the dowels, I dont see why the plates couldnt be aluminum as well as the housings.
Although the 2.3 liter turbo I4 that mazda now makes is a great engine, its ultimately one more reason not to continue their rotary program, as much as everyone here would like otherwise.
Although the 2.3 liter turbo I4 that mazda now makes is a great engine, its ultimately one more reason not to continue their rotary program, as much as everyone here would like otherwise.
the 13a is so rare, that mazda has a restored luce, the car it came in, but it has no engine.
the 2.3T engine is making 265rwhp with the throttle partway closed, and 3-5psi of boost. its got a lot of potential...
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Joined: Jun 2004
Posts: 524
Originally Posted by j9fd3s' post='878839' date='Jul 28 2007, 08:28 AM
the 2.3T engine is making 265rwhp with the throttle partway closed, and 3-5psi of boost. its got a lot of potential...
What does the throttle position matter if it's got positive manifold pressure anyway?
With better but still pump gas friendly compression, rods that aren't made of rejected pot metal, better intake, and good exhaust, the Ranger version of that engine will make something like 250hp from 5500-8000rpm. Airflow limited by the camshafts. Upgrade the cams and it's up to 300hp, and we're still on stock as-cast unported heads. This is also before you dig up any kind of forced induction.
And, they are light.
