OT: Wankel Motor | Posts 16+

Furthermore, with a Wankel engine, fuel consumption is significantly higher than with a gasoline engine, and I don't know why.


Does it ignite three times per revolution, or have I misunderstood something?
How else would the high consumption and high flow rate be explained?


Is that so?

Yep, it ignites three times.

Best regards, WarLord.

However, Mazda doesn't seem to have such significant problems with the seals.
I once spoke to a Dutch person who owned a rotary engine (from an RX7?).
He had a specialized off-road car, and supposedly it was already in its 5th season of use without any problems (and without the engine being opened). Autocross doesn't offer the most gentle operating conditions, and he wasn't even using premium fuel.

The main issue with the Wankel engine is that it tends to consume oil. However, this shouldn't really be a problem; you just need to remember to top it up regularly.

Yes, but the exhaust emissions will get worse if the engine burns oil.

or does it not matter to the AU?


Otherwise, one would have to fear that after a certain number of kilometers, one would no longer be able to obtain the environmental sticker.

The RX8 should also have Euro4 emissions standards...

http://www.wydmuch.de/pageID_1137613.html

It mentions a consumption of 1 liter of oil per 1000 kilometers.

and one more thing:
http://www.jhk1.de/motor/wankel_e.htm

And yes, it has Euro4 emissions standards.

Okay, so 1 liter of oil per 1000 kilometers is really quite a lot. It's like always filling up with premium fuel like V-Power, which costs €1.20.
That is 10,000 liters of oil per 100,000 km.

....no, I don't think that's possible,

Hi,

Quote:

That's 10,000 liters of oil for 100,000 kilometers. ...No, I don't think that's right.

"That's not it either, because that would be 100 liters for 1000 km (which could be the gasoline consumption of a gasoline-powered Wankel engine)."

In reality, it would be 100 liters of oil per 100,000 kilometers if it were 1 liter per 1,000 kilometers.

Best regards,

Jan.

@x world online:

Quote:

Furthermore, with a Wankel engine, fuel consumption is significantly higher than with a gasoline engine, and I don't know why.

As mentioned before, the uneven combustion chamber is thermodynamically very unfavorable. This results in a modest efficiency and, conversely, a high fuel consumption.

@Ingo:

Quote:

It actually ignites 3 times per revolution

.

That's correct, but it happens three times per rotation of the rotor. However, the rotor drives the eccentric shaft (equivalent to the crankshaft in a reciprocating engine), which rotates at three times the speed. Therefore, there is one ignition event per rotation of the eccentric shaft and the rotor.



Regards,
Alex.

Correction: The translation ratio between the piston and the eccentric shaft is 3:2, meaning that the eccentric shaft rotates at 1.5 times the speed of the piston.

Oops , I think I made a mistake, but still, it's too much .

Hello,

"Sure, something like that could be built. However, a diesel engine has a peak pressure that is approximately three times higher than that of a gasoline engine. Consequently, the peak forces acting on all the combustion chamber walls are significantly higher."
The lateral rotor surfaces and the rotor edges on the outer surface need to be sealed. The rotor can only be cooled indirectly. The specific fuel consumption is higher, and the exhaust emissions are difficult to control even with gasoline engines. It is significantly more complex and therefore more expensive to manufacture. Controlling the engine via the sealing surfaces, as with two-stroke engines, is not necessarily an advantage. Overall, there are many disadvantages and few advantages, such as minimal imbalance and therefore potentially high rotational speeds.

Best regards,
Christian.

Hi Bertil,

There is also a picture of the Wankel rotary diesel engine on the page you posted.

http://www.der-wankelmotor.de/Motoren/Wankel_GmbH/wankel_gmbh.html

It works, then!

The Midwest Wankel engine (based on a Norton design) is used to power the Alexander Schleicher motorgliders, but it has significant durability issues. Very few engines reach the 200-hour mark for the first service. In my opinion, this is due to the use of aviation fuel with a high lead content, even though the engine's compression ratio would allow it to run perfectly well on regular gasoline. The lead deposits damage the sealing strips and the internal surfaces. This causes the engine's performance to decrease, and eventually, it will no longer start. The two-stroke lubrication system with an oil metering pump exacerbates the problem.
While the manufacturer, Schleicher, denies this, they haven't been able to fix the problem for years. I know people who are already on their third engine. My advice, if anyone is reading this: switch to unleaded fuel. (This might potentially cause problems with gas bubbles when the engine is warm.)

When it's running, it's amazing, like a turbine, with 60 horsepower from an engine block smaller than that of a moped.

Hello diesel mechanics,

I believe that the Wankel engine, or rotary engine, is still relatively in its early stages of development. Most major manufacturers moved away from the Wankel engine quite early on and focused on developing other technologies. However, despite the disadvantages, such as high fuel and oil consumption, there are enough advantages that speak in favor of the Wankel engine.

- Extremely high RPMs (the highest I've seen mentioned so far is 17,000 RPM).
- High performance with a comparatively very low weight.
- Absolutely smooth running, with very low vibration.
- Relatively few moving (and therefore potentially failure-prone) parts.
- Very versatile in terms of fuel options.