kantonm

So I have a question...From what little I know of rotary engines and diesel engines I am wondering why they haven't made a rotary diesel.
1. diesel engines operate at higher temperatures to try ro burn the excess fuel...rotary engines already operate at a high temp.
2. rotary engines require lubrication in the combustion chamber...diesel fuel has more "oil" in it than gasoline...solves a problem right?
Also diesel engines have a lot of torque and low horsepower and the rotary is the opposite....
I am admittedly not an engineer I am just curious...

Aseras

there are diesel rotaries. It's just that generally diesel's are for commerical applications and noone wanted to really develop a whole new engine and all around it. Licensing fees for rotary tech back in the 70's we pretty outrageous too.

Beodude123

Diesel burns slowly, that is why there is so much low down torque. If you tried winding out a diesel engine to 9,000 rpms... LoL It would be pretty funny.

Seriously though, it would be a purely low rpm machine, and it's piston counterparts would be better suited I think.

captain mercury

so if 'they' were to continue developing a deisel rotary for everyday drivers, would it work more efficiently or whatever like kantons points 1 and 2 suggest?

Chrisbert

I'd like to see one running in our 1.3L. I wonder if our chambers could deal with the compression needed. I think pistons are better suited to the diesel cycle.

raspyrx7

yeah I'm not so sure the internal gearing would be ideal for a rotary, you'd still have to wind it out more than its piston counterparts.

globi

Rolls Royce and Yanmar Diesel worked on Wankel-Diesel engines:
http://www.der-wankelmotor.de/Motore...lls-royce.html

rx8wannahave

^what do they say on that website? How much power did it make...spec's etc?

guy321

345HP at 4500 RPM, :P Can't you read numbers?

guy321

That's in the R6 1972 version

leon0911

Hy,

I've been reading on this forum a while now... and here it is. The first post...

As you could see on this website, the total horsepower reached in a dieselwankel is 350 bhp!? And this is without any new dieseltechnology like 3th generation common rail. It's kind of a big engine though and it's the first time I see that the two combustion chambers (or how do you call 'em in rotaries) are different in size. The first is quite big: 3250 cc. Seems like a lot for a rotary.

Imagine the possibilities: nowadays diesle engines reach 160 bhp for a 2.0 liter... Probably there a good reason why they aren't developing this further. Perhaps because of the design of a rotary the high compression rate is hard to reach?

tuj

The combustion chamber shape of a rotary makes diesel difficult.

rx8wannahave

Me no lern good....

I didn't see those numbers, but intersting regradless.

zoom44

im reading the page translated. am i understandign this correctly? it say stage one chambe rvolume 3250 and stage 2 chamber volume 1265. in the chart at the bottom it says 2 x (3250 +1265)

that suggests to me that they may be using first stage as a compressor then handing it off to the smaller stage for final compression / combustion.


is that right?

Tamas

iTrader: (1)

That's how I'd understand it too, yes. At least that's how that page explains it (and I do speak German).

rotarygod

You guys don't need a translation. You just need to find someone with a book with all the info on it who can scan it!

leon0911

very, very intresting

thanks!

djgiron

Wonder how much torque those were putting out. Can you imagine a 6.4 liter Rotary with 700hp in a Ford Superduty! Wonder why Mazda never expanded those ideas? It is all useless now, the way California is going, all diesels will be outlawed next year anyway.

zoom44

thanks. thats preetty cool

zoom44

the L shaped seal that allows the gas to get behind and seal it tighter is ingenious. the whole thing is just brilliant

tuj

The only problem is that Rolls would put it in a 7000 lbs car.

rx8wannahave

Thanks RG...that was some good reading!

rx8wannahave

A thing about that...I know their engine was a high compression engine, but could the L shaped seal but good for our rotary?

mike1324a

Any idea on torque? This is a cool design.

Aseras

I'm gonna resurect this thread.. I've been considering tinkering with a diesel rotary and this picture piqued my interest.. is this a 13b rotary I spy?

http://www.smartplugs.com/images/engines/rotary3.jpg



I've been debating running a gas-diesel mix first. maybe 5-10% to start and going higher.