klo 15:03 | 11.3.2008
http://www.gizmag.com/go/5139/
RCV Engines
February 2, 2006 UK-based RCV Engines is best known globally for its range of model aircraft engines but the unveiling yesterday of a prototype 125cc Rotating Cylinder Valve (RCV) scooter engine could put it on the map in a far more significant way. The RCV engine is ideally suited to sub-250cc applications such as motorcycles, scooters and power tools where it offers 100PS/litre performance and manufacturing costs akin to those of a two-stroke, with the emission levels and fuel consumption of a four-stroke. International demand for small motorcycle engines is massive with the Chinese, Indian and Indonesian markets accounting for 22 million small capacity engines annually – traditionally, these have been two-stroke engines but with the advent of exhaust emission regulations the bulk of production is now represented by larger, more expensive and less powerful 4-strokes.
2 - 4 tahtarin välimuoto, jolla pitäisi olla ainakin kustannussäästöjä. Tarkemmin sanottuna kiertoventtiilimoottori pieniin sovelluksiin. Kierrosherkkyys voi olla heikko suuren liikkuvan venttiilin vuoksi.
Noita on lennokkikäytössä ollut jo jonkin aikaa...
Kun teho otetaan ulos nk 'nokka-akselilta' oli noissa perinteisiin polttiksiin
verrattuna se etu että niillä voitiin pyörittää huomattavasti isompia potkureita.
Alkuun noissa oli jotain lämpenemis ongelmia.
-JJ
http://www.rcvengines.com/rcv_modelhome.htm