4 Reasons Why The Rotary Engine Is Dead



4 Reasons Why The Rotary Engine Is Dead. The Wankel engine was last seen in a production car in the Mazda RX-8, and currently there are no rotary engines in production. Mazda may bring it back in the RX Vision, however there are many disadvantages to the rotary engine which has kept it from being successful. Rotary engines have a low thermal efficiency as a result of a long combustion chamber and unburnt fuel making it to the exhaust. They also have problems with rotor sealing as a result of uneven temperatures in the combustion chamber since combustion only occurs in one portion of the engine. Oil consumption is also a problem, as oil is injected to add lubrication and help keep the rotor sealed. Finally, emissions are poor and fuel economy is terrible, and ultimately this is the cause of it’s death.

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47 thoughts on “4 Reasons Why The Rotary Engine Is Dead

  1. The main advantage a rotary engine has is compactness.
    Norton used one on motorcycles with some success, although when racing they bumped into other issues…
    How to cool the thing, and how exactly do you classify the CC of a rotor which is doing 3/4 of a suck/squeeze/bang/blow cycle each rotation?!

  2. Yeah you are so dam right although these engines are cool ? there are pretty pathetic for general use.
    Not to worry though we will all be driving electric in ten years or so

  3. I was wondering for a minute how come it is 23-29 liters per 100km in 2.0L engine… 🙂 Please clarify next time that it is American "MPG" metric.

  4. compare 2011 rx 8 to 2015 stingray and gla 45 because this 4 years don`t make any difference in cars build and performance(and keep in mind this rat-race between cars factories) + this engine almost didn`t change from 2003 when rx 8 was release (sorry if my english is bad)

  5. The rx8 aren't a good example of the rotary engine since they had an assortment of other problems that contributed to said problems such as gas mileage and a good engine example would be rx7 which actually had anywhere from 17-19 in the city and 23-26 on the highway

  6. The Wankel engine really is completely obsolete now, production at Mazda ended half a decade ago, Mazda unveiled its last production RX engine almost 23 years ago!

  7. The Wankel engine is no longer manufactured by ANY legitimate engine manufacturer anywhere in the world today… the design fell out of favor in the 1970's when a general consensus confirmed the design offered far less development potential than reciprocating technology and was plagued by several flaws and disadvantages inherent to the Wankel basic concept.

  8. In short it works fine except of the high wear at sealing faces, so you need frequent overhauls or better material designs.

    Efficiency is actually pretty good.

  9. The Wankel engine is dead for one simple reason… people stopped buying them. Mazda never sold enough RX-8 to recover the development and production costs.

  10. There is not only fuel efficiency to blast this engine to the past as you seem to be so willing to do so.
    It has far fewer moving parts and is lighter, get more HP for a same bore etc.
    Yes it is not so efficient, but it takes up less space and uses less parts for a better power to weight ratio.
    Its unfortunate that nobody was tooled or trained to work on these engines and was pushed out because of that.
    When it came in its only issue was its seals.

  11. I was sixteen when I first saw a prototype at the motor show in London and being a petrol-head even then I fell in love with Felix Wankel's engine, what an unusual design but this is what inventers do to try and improve power units, yes it was thirsty and had a narrow  power band area and no torque at lower rev's but quite a few car manufacturers and motorbikes used them and many won races as well,  although I never owned a vehicle with a Wankel engine but I have two Japanese O.S. model engines of .30 cu in for model aeroplanes that I fly and find they have more power than a conventional engine of the same capacity..

  12. The answer is simple in my opinion: the piston engine companies didnt want a more efficient motor than their own on the market so it prevent the development of this machine and now many persons believe that the rotary engine sucks (it had way less development)

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