Which do you think is smoother, the smoothest of the smooth piston engines, or a rotary like the renisis?
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this has to do only with the amount of imbalance you find in the reciprocation. because it's so much easier to balance so many fewer parts, and the reciprocation is slower at all rpm, i'd wager you could make a wankel much smoother than a boinger. but of course, that's a pretty tough thing to say, eh?

i mean as of right now
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hard to say... the wankel design, as i said before, would probably be easier to make smoother, but there are tons of engines at a far higher level of refinement in design and manufacture.
probably, the smoothest engine would be some rediculously expensive ultra-luxo V12 or something... like the one in the big new Merc or something.

word, or the BMW 760's or like rolls and bently's and maybachs and such, the lex's, those things are crazy smooth.
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You also have to understand that the rotary is meant as a sports car engine. If you compare it to other sports car engines, it is probably the smoothest around. The only thing that might come close in the sports car world it the BMW inline 6.

Originally posted by cueball1029
You also have to understand that the rotary is meant as a sports car engine. If you compare it to other sports car engines, it is probably the smoothest around. The only thing that might come close in the sports car world it the BMW inline 6.

touche!! :D

Originally posted by cueball1029
You also have to understand that the rotary is meant as a sports car engine. If you compare it to other sports car engines, it is probably the smoothest around. The only thing that might come close in the sports car world it the BMW inline 6.

-agrees

Originally posted by wakeech


touche!! :D
How so? I didn't mean to make it offensive to you.:)

I think it depends on how heavy you make the flywheel... if you make it heavy enough then any engine should be pretty smooth.

Do rotaries have flywheels?

Originally posted by ProtoConVert
Do rotaries have flywheels?

yes definitely... everything from the outputshaft back is exactly the same...

...but i'm unsure about the dampening effect of the flywheel... it seems, at first glace, like it would influence it, but, i'm unsure...:confused:

Any extra inertia to change (like a heavier Flywheel) will result in a dampening effect to Rotational Speed variations. The heavier the flywheel, the more forces it would take to make the engine vary speed. However, this would not necessarily affect the level of vibration in the engine, as this is caused by off-balance components being forced to spin on an axis that isn't exactly their center of gravity. The more balanced, the less lateral vibration. However, even a perfectly balanced engine will experience some vibration based on the shifting torques caused by uneven forces (each cylynder firing at different times)... Well, with the exception of a turbine... it has a constant force... These are the vibrations that a heavier flywheel can smooth out...

I read in one article or another that the Renesis's rotors are manufactured with the highest precision yet, so I would think that it will be even smoother than the current rotaries. I look at it this way: I can rev my 1979 12A powered RX-7 up to 7 grand and not notice if I'm not looking at the tach. This coming from a twenty-five year old motor! So if the Renesis is smoother than that, then it'd probably give a V-12 a run for its money.

To demonstrate to a group of reporters the reduced vibrations of the new engine, testers placed a glass of wine atop an engine, then revved it to 5,000 rpm, which they said would be the typical speed on a Japanese highway.

The wine barely rippled.



http://autoweek.com/cat_content.mv?port_code=autoweek&cat_code=carnews&loc_code=index&content_code=06497471

The only inherently balanced piston engine is the inline 6 (and also V-12 as it is basically two I-6s joined together). All other piston engines require the added complexity of parts like balancer shafts to try to reduce their inherent vibration.

Although I wonder how an M3 engine at 8000rpm would compare to the RENESIS at 8000rpm. I'd bet the rotary will be a little smoother at high rpms, but we'll have to wait a few months to find out...

Originally posted by wakeech

touche!!

Originally posted by cueball1029

How so? I didn't mean to make it offensive to you.:)


I think he was saying "too-shei" not "tuh-chee." It's a respectful gesture to another when they make a great counterpoint. Correct me if I am wrong, wakeech.

you are indeed correct. it derives from fencing, where the french, "touche" accent on the "e", means that your opponent has scored a touch - it actually means "touched" directly translated.
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