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Fundamental Flaw of Rotary?

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Old 06-20-2010, 11:12 AM
  #26  
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Originally Posted by MICHGoBlue
So every car makers except Mazda is stupid...?

The few companies such as Mercedes Benz that took on rotary engines for a short amount of period then dropped it even though it's a better design fundamentally?

Sorry, as big of a rotary fan as I am, I simply can't imagine the only thing holding down rotary is profitability aspect of it due to the lack of mass production...

If profitability is the only problem, shouldn't all race cars be rotaries since they are "better"?

Sorry, not a engineering guru, just a consumer raising some common sense queries.
If you read the history/blue prints from the early days, you will know why most people drop Wankel Engine design. The biggest issue they had were the chatter marks and oil/fuel consumption. They know that with enough effort they will be able to figure it out. but the upper management doesn't want to take any risk (more like they dont want this to hurt their profit) and if piston works fine, why bother with other designs?

Mazda was thinking a little different, back then President Mr. Matsuda wants something to represent their brand, some brand image thing. and Rotary seems like a pretty interesting concept and if they can make it work, a lot of people will know Mazda. a lot of people called him nutz. Just like any explorer, ppl always call them nuts.

Aluminum Rotors will solve a lot of problems. but too bad the production cost would be too high.
Old 06-20-2010, 11:41 AM
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Originally Posted by nycgps
If you read the history/blue prints from the early days, you will know why most people drop Wankel Engine design. The biggest issue they had were the chatter marks and oil/fuel consumption. They know that with enough effort they will be able to figure it out. .
will or might?

Even with modern technology like direct fuel injection doesn't seem like it would propel it to where a piston engine producing 230 bhp would get as far as mpg.

Mazda's passion for rotary is awesome, admirable and refreshing. The economic consequences seem to be rather unfortunate. Maybe the other car companies did have the right idea on passing on the rotary concept.
Old 06-20-2010, 12:24 PM
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The piston engine has too many moving parts.

That is another design flaw.

If the piston engine was banned and outlawed, engineers would not design something so complicated from the ground up.
Old 06-20-2010, 12:53 PM
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Originally Posted by rx8_4TWin
i am not saying piston engine is perfect, but it indeed gets even thermal distribution, unlike rotary.
The piston engine has a design flaw as well (borrowing your own words). Combustion occurs at the top part of the engine so the bottom remains relatively cooler. Some way of distributing heat would be needed otherwise it will too suffer heat differential.

Furthermore, it contains many moving parts increasing the sm total of parts to replace due to wear and tear. Pistons, cylinders (relative to the piston), cam, valves, conrods, crank etc, etc.

The rotary has 6. Genius.
Old 06-20-2010, 12:54 PM
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Cool

Originally Posted by Razz1
The piston engine has too many moving parts.

That is another design flaw.

If the piston engine was banned and outlawed, engineers would not design something so complicated from the ground up.
Damn, you beat me to it.
Old 06-20-2010, 03:51 PM
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Originally Posted by MICHGoBlue
Mazda's passion for rotary is awesome, admirable and refreshing. The economic consequences seem to be rather unfortunate. Maybe the other car companies did have the right idea on passing on the rotary concept.
Are you a car enthusiast - or an accountant? As car afficianados, our job is to want the best, most interesting, most forward-thinking, most superior products out there. Let the corporate bean counters kill the rotary engine, BetaMax, and any other smarter, more progressive technology. That's their job – not ours.
Old 06-20-2010, 04:06 PM
  #32  
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Every engine is a collection of compromises...
in fact, that's what engineering is all about: Managing the compromises.

Give me an RX-5 with a nice MS package...

Oh... forgive me... I'm drinking...
Old 06-20-2010, 05:04 PM
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Originally Posted by Eish
The rotary has 6. Genius.
actually its just 3 moving parts...the 2 rotors and the output shaft ("crank shaft").....that is unless its a 3 rotor...then its 4 parts...or a 4 rotor....then its 5 parts........with the engine alone....
Old 06-21-2010, 08:14 AM
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Originally Posted by New Yorker
Are you a car enthusiast - or an accountant? As car afficianados, our job is to want the best, most interesting, most forward-thinking, most superior products out there. Let the corporate bean counters kill the rotary engine, BetaMax, and any other smarter, more progressive technology. That's their job – not ours.
I hear ya, but I just don't have the ability to be myopic, can't help it.
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