Just reading Eureka (get it free every month) and came across an interesting new rotary engine !
Enjoy :
http://liquidpiston.com/newsdesc/nid/34.html
Shaun
Now that is a great idea! They should build a bigger one to show it works on an engine big enough to power a standard sized car
can it be turbo charged?
Early days by looks of things. Not much info on the site yet !
Shaun
That is not actually a new idea for a rotary engine. The principal was invented by Fred Umpleby in 1908!
See this, it is exactly the same.http://www.google.co.uk/imgres?q=Umpleby+engine&hl=en&sa=X&biw=1280&bih=929&tbm=isch&prmd=imvns&tbnid=t13_CayvOYTcfM:&imgrefurl=http://www.aqpl43.dsl.pipex.com/MUSEUM/POWER/unusualICeng/rotaryIC/rotaryIC.htm&docid=wLpIhzeshvg4aM&imgurl=http://www.aqpl43.dsl.pipex.com/MUSEUM/POWER/unusualICeng/rotaryIC/umpleby1a.gif&w=400&h=377&ei=ybymUIeKI-LF0QWNxYCwAQ&zoom=1&iact=rc&dur=1&sig=111485686917034392201&page=1&tbnh=131&tbnw=136&start=0&ndsp=35&ved=1t:429,r:0,s:0,i:69&tx=90&ty=98
Amazing, learn something new ever day :D
Shaun
Anyone else looking at that and seeing a Rotor Housing being used as a "Rotor"... And still imagining a Rotor going around the shape of the Kidney-bean.
My Brain is now broken for the day...
Well the engine you have was described as a ":censored::censored::censored::censored::censored::censored::censored:ised" version of what Felix Wankle had developed! \'His\' first prototype engine had a rotor rotaring one way and the housing the other.
Wankels 1st engines had rotor and rotor housings turning the same way but at different speeds. 2 to 3 ratio.
Must have made it difficult to get the inlets and exhaust ports in the correct place.
Shaun
Spark plugs were in the rotor faces! Engine needed dismantling to change them!
That having been said it was 125cc and did do 25,000 rpm!
Induction came through the e Shaft.
With all of the benefits, High comp ratio, over-expansion of exhaust gas, it still suffers with some fundamental geometric limitations; namely combustion chamber shape and intricate inlet/exhaust ports. With liquid fuel, crevice losses will likely be very high, surface area to volume ratio (and therefore heat rejection) will be high and practical efficiency will be lower than expected.
The design seems to make the assumption that at the higher compression ratios, the fuel is not prone to knock; anyone can draw a PV diagram for a spark ignition engine that offers greater efficiency than diesel; but practically its unlikely to be acheivable.
Nice idea regarding atkinson cycle operation though - a longer exhaust stroke than compression stroke; although this doesnt look variable. It\'d be interesting to see whether the motor will still suffer with the low speed/power density issues conventional atkinson cycle motors suffer with. (or even more conventional engines with aggressive VVT that are given the name atkinson engines like the prius)
always an interesting read. I\'ve got some genuine japanese books written by the lead designer at Mazda, they consider many different rotary lobe designs, and summise well why the 3side rotor, 2-lobe design was chosen, ill see if i can dig them out.
Steve