twin rotary engine?
#1
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twin rotary engine?
here's a question...can you get more power if you had a twin-rotary engine? Consider it would be set up like a DOHC, only with 2 rotary chambers side by side. Then externally, chain driving a flywheel. Would it work? Would it be powerful or have too much parasetic loss from the chain drive?
![](http://www.thirdshiftstudios.com/images/thumbs/twinRotary.jpg)
I'm sure my proportions are off
![](http://www.thirdshiftstudios.com/images/thumbs/twinRotary.jpg)
I'm sure my proportions are off
#3
I think it's cool. As I understand, one of the main problems
of the Wankel engine is the stress on the e-shaft as you increase the number of rotors. In this design, you have 2 shorter shafts. If Mazda ever decides to build an 6/8-rotor Veyron killer
this would help.
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#8
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not too sure if it would be a good idea, a properly setup 3 rotor can already make more then enough power. plus i guessing a twin 2 rotor engine (4 rotors) will have super shitty gas mileage. and will be uber difficult to fit in any engine bay. i think mazda jus needs to keep workin on the 2 rotor and try to make it more mainstream as far as reliabily/power/mileage goes...and perhaps work on getting back in the turbo rotary game...even if its just a small amount of boost.
#9
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It's called 4 Rotor set up. Basically normaly rotary engine with one rotor added at each end of the engine and the shaft changed so it moves with 4 rotors instead of two. Not very hard to figure out at all. Just the materials are not easily out in the market opposed to piston engines.
And yes, the gas milage is very poor, that's why it's only found in Mazda racing cars.
Using a chain like the OP idea would be impossible to get any decent power. A single misfire in one engine would kill the thing. Replacing the chain with a shaft would be better idea.
And yes, the gas milage is very poor, that's why it's only found in Mazda racing cars.
Using a chain like the OP idea would be impossible to get any decent power. A single misfire in one engine would kill the thing. Replacing the chain with a shaft would be better idea.
#10
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i think the problem would be is that the engine would be too wide. but it might work. and i dont see how a misfire would kill the engine, as its not the eccentric driveshaft that would output, you would get slack when the 2 shafts lined up horizontally. unless the tensioner moved around like that of a bicycle.
however, this idea has merit because it makes the engine almost as short as a 2 rotor. keeps the weight farther back. but. uh. i think it would be too wide. also, you might have to mount the double engines too high up, and that would make the car top heavy.
however, this idea has merit because it makes the engine almost as short as a 2 rotor. keeps the weight farther back. but. uh. i think it would be too wide. also, you might have to mount the double engines too high up, and that would make the car top heavy.
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here's a question...can you get more power if you had a twin-rotary engine? Consider it would be set up like a DOHC, only with 2 rotary chambers side by side. Then externally, chain driving a flywheel. Would it work? Would it be powerful or have too much parasetic loss from the chain drive?
![](http://www.thirdshiftstudios.com/images/thumbs/twinRotary.jpg)
I'm sure my proportions are off
![](http://www.thirdshiftstudios.com/images/thumbs/twinRotary.jpg)
I'm sure my proportions are off
Nice of you to put in the thought & animation but the practical aspects of your idea fails unfortunately.
To manufacture a rotary engine as you suggest would invoke losses leading it to be impractical for street use.
Two rotors inline is far more efficient than two rotors side by side. Or four rotors inline being more efficient than two X two rotor engines side by side.
REgards
#12
Even if you were able to produce such a design as having two rotary motors working together, the primary benifit of the rotary engine is it's small size vs. power output.
With this design, you would end up increasing the needed space to the extent you would need a ton of realestate to do what a 4 rotor rotary could easily accomplish.
Interesting concept...
With this design, you would end up increasing the needed space to the extent you would need a ton of realestate to do what a 4 rotor rotary could easily accomplish.
Interesting concept...
#14
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the germans tried this out in WWII with piston engines, they made a 2 prop bomber with 4 engines, it failed because the engines tended to overheat and then catch fire.
VW makes some engines like this on some of it's current cars, the W12 in the phaeton and toureg come to mind, same as the W16 in the veyron. so it works in piston engined designs. I'm not sure how they tie them together, but I'm sure it's more complicated and safer than with a chain.
I think it could work, with the flywheel in front of the engines instead of below them so that a belt or torque box from each engine would power the shaft that spun the flywheel. Yes the engine would be wide and unlikely to fit in a normal car, but what kind of normal car needs the power given by such a monstrous engine or can fit it? answer: the veyron
the bugatti veyron will run at 250 mph for only 12 minutes before running out of a full tank of gas. Over that time it will travel 50 miles and get all of 1.9 mpg.
so the idea would probably work, but an inline 4 rotor like the 26B would be more space efficient. I do wonder if they could actually ever make a 4 rotor based on the renesis tho because of it's side porting system.
now TWO 26B's side by side coupled up like that... that's what I'M talking about :D
VW makes some engines like this on some of it's current cars, the W12 in the phaeton and toureg come to mind, same as the W16 in the veyron. so it works in piston engined designs. I'm not sure how they tie them together, but I'm sure it's more complicated and safer than with a chain.
I think it could work, with the flywheel in front of the engines instead of below them so that a belt or torque box from each engine would power the shaft that spun the flywheel. Yes the engine would be wide and unlikely to fit in a normal car, but what kind of normal car needs the power given by such a monstrous engine or can fit it? answer: the veyron
the bugatti veyron will run at 250 mph for only 12 minutes before running out of a full tank of gas. Over that time it will travel 50 miles and get all of 1.9 mpg.
so the idea would probably work, but an inline 4 rotor like the 26B would be more space efficient. I do wonder if they could actually ever make a 4 rotor based on the renesis tho because of it's side porting system.
now TWO 26B's side by side coupled up like that... that's what I'M talking about :D
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The VW 'W' engines (W8, W12, W16, must be a multiple of 4,) still only use one crank shaft. The Cylinders are just arranged in 4 rows rather than the 2 of a V or the 1 of an inline. There's a bit more to it than that, but it's really just a glorified V design.
The closest thing this would be to is an H configuration iirc. This configuration consists of 2 horizontally opposed engines, each with its own crank, either geared or chained together. I don't think there have been any production engines of this type. Actually, after consulting Wikipedia, it appears a U configuration has also been tried, which is the same as the H except using inlines instead of horizontally opposed.
http://en.wikipedia.org/wiki/U_engine
The closest thing this would be to is an H configuration iirc. This configuration consists of 2 horizontally opposed engines, each with its own crank, either geared or chained together. I don't think there have been any production engines of this type. Actually, after consulting Wikipedia, it appears a U configuration has also been tried, which is the same as the H except using inlines instead of horizontally opposed.
http://en.wikipedia.org/wiki/U_engine
#19
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Check here for a few data and a photo (look at the last entry in the "variants" section).
A few more info in the link about the Heinkel He-177, the airplane that was supposed to use the engine.
They also tried it again with two DB 605 engines, creating a DB 610 (link, always last entry in the "Production versions" section; photo on the right)
#20
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another advantage of the Rotary is it's ability to be mounted low and far back in the engine bay. If you place them side by side, it wouldn't fit in anything close to an 8 or an RX7.
Nice idea though, but 4 rotors lined up would make more sense.
Also, 4 rotors = SUPER expensive and only put in race cars. 3 rotors however....
Nice idea though, but 4 rotors lined up would make more sense.
Also, 4 rotors = SUPER expensive and only put in race cars. 3 rotors however....
#23
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#24
I don't buy Kool-Aid
I recall a few years back at Seven Stock, Someone had a Blue Rotary powered car that had a Rotary Engine in the front and one in the back. That was working. Anyone?
#25