Mazda MX-6 Forum - View Single Post -'s Rotary Talk Thread... Rotary talk only!
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post #99 of (permalink) Old 11-27-09, 20:35
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Originally Posted by JoeyV View Post
I take offense in THAT. They are just idiots. I'm actually trying to create something NEW.

I understand that less parts is best, but what I'm thinking is STILL less parts than a piston engine. Like I said, I'm no engineer and this is just the drawing I made to illustrate my quick Idea. I want to eliminate the engine rumble and port overlap, that's all. Actually putting time into it would make for better ideas, but I'm not paid for that, so I probably won't. I just thought I'd share my idea....

But thanks for encourage my creativity Matt
I didn't mean to kill your creativity, but think of it simply and the idea will come to you. Complicating it doesn't make it better, but rather worse. Although your idea may use less parts then a conventional engine, it still uses more then a traditional rotary, therefore less efficient. Your on the right track, just think of taking things away rather then adding them in.

Originally Posted by ls six View Post
Hey Joe, heres some more input I noticed that you kept the triangular rotor shape, since you no longer have the peanut shaped housing and reciprical motion the rotor can be entirely round! That would make more robust seals possible and even multiple seals.

at this point it's starting to become remenicant of old style rottary radial engines used in some aircraft, but where the output of those motors wat the crankcase it's self and the crank (and therods and pistond atleast radialy) was held stationary in this case the crank and housing are stationary while the while the rotor/piston assembly rotate.

The one issue I see being a problem is controling the pistons, especialy on the intake stroke. After the piston starts down the trailing side of the IN/EX cam you are depending on it to draw the fresh charge in, under most operating conditions the motor will operate completely on the standard induction principal, and with no positive retention of the piston to the cam we depend entirely on the return springs to keep the piston against the lobe and provide the "draw" for induction.

We have a situation similar to what OHV motors have, we need to provide enough spring pressure to keep the piston from "floating" without over stressing the related components. This would be RPM dependant also so too little spring limits RPM and too much limits the working life of components and would draw a significant amount of power.

I4, most rotaries last a very long time without failure. Ofcourse these people dont log on to let everybody know the have had no issues It's the same principal thats at work on and even Honda and Toyota forums. Look through any forum and you will see page after page of people asking why the car just broke!
Rotary engines are not known for longevity, although there are some, there aren't as many as there are conventional engines. Just by design, they wear out. But in defence of rotary, when they need a rebuild, the traditional piston engine needs a timing belt or some other form of heavy service. Both have their ups and downs, but my comment was made more as a general comment. In other words, you don't see 700,000-1,000,000 mile rotary's, but you do piston. Not to say it hasn't happened, but its not likely to happen as often as it does with others.

I do like the idea you present about a round rotor chamber. Seals wouldn't see the regular wear being closer in tolerance, but the downside is the eccentric shaft would have to be PERFECTLY balanced to insure long life. Not impossible. I'd love to see someone draw that up really.

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