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"Turbo Alternative" from Rotary Engineering

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"Turbo Alternative" from Rotary Engineering

Old 01-13-19, 09:15 PM
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"Turbo Alternative" from Rotary Engineering

The engine built by Rotary Engineering more than a few years back was apparently based on a four port 13B with Weber 36 carbs, hardened front and rear stationary gears, locked rotor gears and something tthey called a "rallye" port configuration and nitrited cast iron housings. Supposedly it sold originally for about $3,200 back when.

Even though the engine sounds good, it only generates about 225 horsepower according to the ad in Rotary Review number 23.

So, a question is whether it is really worth buying in an old "81 RX-7 with a litte rust and not a good paint job given the much greater horsepower available from a turbo setup.



A second question for knowledgeable others is whether a different port configuration besides whatever a "rallye" port configuration is would boost the horsepower enough to be worth the trouble.
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Old 01-13-19, 09:59 PM
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It really all depends on what you're looking for and what your goals are to be honest. I'd be happy to ask Dr. Wayne Graham (founder of Rotary Engineering) specifics if you'd like. I work with him almost every day.
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Old 01-13-19, 10:11 PM
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Originally Posted by whitetiger View Post

So, a question is whether it is really worth buying in an old "81 RX-7 with a litte rust and not a good paint job given the much greater horsepower available from a turbo setup.

A second question for knowledgeable others is whether a different port configuration besides whatever a "rallye" port configuration is would boost the horsepower enough to be worth the trouble.
First question.... no, you need to turbocharge whatever RX7 you get; every side port rotary needs (requires boost)


Second question. Peripheral port. 787 nuff said. If ever I buy an RX8 I'll build a PP engine for it with webbers or IDA carbs.
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Old 01-14-19, 02:18 AM
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Originally Posted by Qingdao View Post
First question.... no, you need to turbocharge whatever RX7 you get; every side port rotary needs (requires boost)


Second question. Peripheral port. 787 nuff said. If ever I buy an RX8 I'll build a PP engine for it with webbers or IDA carbs.
Did the engine in your rx start life as a turbo or was it an NA? Whats your opinion of turbo'd NA's?
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Old 01-14-19, 08:07 AM
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Originally Posted by Qingdao View Post
First question.... no, you need to turbocharge whatever RX7 you get; every side port rotary needs (requires boost)....
Disagree.
200+ hp (NA) on a (IIRC) 2000 lb decently prepped FB has to be a lot of fun. Adding a turbo can be great, but it’s a lot of money, work and time to do it properly and depending on the use of the car, fixing something that isn’t broken.

If it were my call, I think I’d spend the money looking for a clean car to put the engine in,...along with 4-wheel discs and LSD. You’d still have something unique and fun without all the baggage.

Last edited by Sgtblue; 01-14-19 at 08:17 AM.
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Old 01-14-19, 10:38 AM
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Originally Posted by wryder View Post
Did the engine in your rx start life as a turbo or was it an NA? Whats your opinion of turbo'd NA's?
It was a 4 port turbo engine. 12A's run low enough compression so you don't have to worry about detonation.

Don't turbocharge 6 port 13Bs.... not only for compression reasons but port timing is not optimal for turbo. Just buy some Tii rotors and use those.


Never witnessed a 2000# FB. My first RX7 was 2300 with me in the car (I don't weigh but 180). It had no a/c, RB headers, and no spare tire, no sunroof, and lots of rust chipping off lol.

200whp? NA? that's asking a LOT. Not un doable but a lot. Way easier to bolt on a turbo and tune a carb imo. To make a 200hp NA car you'd have to make an exhaust; you have to make an exhaust for a turbo car. To make a 200hp NA car you'd have to tune the crap out of a carb; you have to tune the crap out of a carb when you turbocharge. To make 200hp from NA you'll need a bang up ignition system; turbo cars require a bang up ignition. Then after its all said and done the turbo car is making more power same effort.


I'm not saying NA is worthless. YES if you are racing; an NA V8 is the way to go, but rotary exhausts are SO powerful. Why not use that power?
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