2 stroke vs 4 stroke

No... I was asking! I have never seen one. Apparently, two strokes were more viable. So far as I know, the Wankel has never been a successful engine. I don't think Mazda uses them any more.
Funny, but the basic engines designed at the end of the nineteenth century haven't changed in any basic way. The Wankel was the exception, and it came close to being a fundamental change in engine design. And that was fifty to sixty years ago.

 

http://www.mazda.com/mazdaspirit/

They still make them, but are only used in the RX-7 and RX-8 I think.
They use too mutch fuel to be used in annything else than a sports car.

 

Okay. Wasn't sure. Yeah, they use fuel--- and maybe they can't make them any more economical than piston engines.

 

The wankel engine was used in the mazda, the RO80. Its only down fall was its smootheness and the idiots that drove them over reving ( the consiquences of its smoothness)

it has been used in a motorcycle too ( forget which one)

On the other hand the rotor tips have been improved now. I think the only reason its not seen more of is that people will just not move away from the piston engine.

I saw a wankel marine engine in a boat magazine some years ago.

 

I would defently buy a wankel if they could prove the same fuel efficensy as a piston engine and same service life

 

In the sixties, the RO80 was an NSU, wasn't it?

 

I think NSU had one as well --wasnt it called the NSU Quickly?

NSU did a 'Quickly' but it doesnt sound like a name you would pick for a Wankel motor.

But thers something familiar about your question.

 

NSU had the Prinz and the RO80, I think.
Johnson, in '73, had this:

http://sports.webshots.com/photo/2520111070091848696keHkxG

 

Ok i cheated as well I googled ( shame)

Mazda and NSU did make the RO80

Never -ever seen the Johnson,-- wow- what happened to that.

Did it work?

 

A ugly looking thing. Was it a prototype or was it sold?

 

I thought Mazda didn't use rotary engines more widely due to high fuel consumption and low torque.
Turbos changed the torque problem quite dramatically.
Look at the specs of the auto RX 8 compared to the manual, there's a big drop in hp and torque.
In my earlier days driving my RX 3, the guys in automatic cars never stood a chance on the street or track.
There is an engine builder in Melbourne, Aus that fitted a turbo triple rotor to a ski race boat.
There's a clip of it on you tube and the acceleration and sound are awesome if your'e a fan of rotary engines.
Website is http:/www.extremerotaries.com/ , click on the photos/videos link.

 

A friend of mine had a Mazda rotary mini-truck. This was a ways back.

 

I reckon your friend might of enjoyed driving that mini truck!
I remember seeing a racing beat mini truck with a turbo twin rotor (13B) in an Aussie car mag about 15 years ago.

 

Citroen GS used a Wankel engine in the 1970s, for racing (?)

From http://members.tripod.com/mattysk/types/birotor.htm:


GS Birotor
In 1974 the without a doubt most remarkable GS was introduced, the 'GS Birotor'. After experimenting with the wankelengine in M35 (Ami coupé), Citroën introduced the Birotor as the next car with the so called wankel engine. The wankelengine was a product of the cooperation between Citroën and NSU. NSU produced the RO 80 with the wankelengine.
Unfortunately the Birotor was introduced at a bad time. The oil crisis asked for cars with low fuel consumption, the Birotor with it's thirsty wankelengine didn't became a succes. An other thing that happend was the difficult period Citroën was having in the mid seventies, just before the PSA takeover. Citroën decided to stop with the Birotor and recalled the cars to the factory. To prevent from having all the parts in stock. Luckely they didn't succed in recalling all Birotors. But of the 847 Birotors produced, only a handfull still exists. This makes the Birotor a very exclusive car, they cost small fortunes nowadays.

 

Is it true to say that new 2strokes are as thirsty as 4strokes at full speed? How do they compare at 3/4 full. Which would be the cheepest 2 stroke 150HP compared to a 4 stroke?.