|
The split-single (''Doppelkolbenmotor'' to its German and Austrian manufacturers), is a variant on the two-stroke engine with two cylinders sharing a single combustion chamber. ==Principle of operation== The split-single system sends the intake fuel-air mixture up one bore to the combustion chamber, sweeping the exhaust gases down the other bore and out of the exposed exhaust port.〔(Diagramatic split-single ) Fuel-air circulation and the Y-shaped connecting rod.〕 The rationale of the split-single two-stroke is that, compared to a standard two-stroke single, it can give better exhaust scavenging while minimising the loss of unburnt fresh fuel/air charge through the exhaust port. As a consequence, a split-single engine can deliver better economy, and may run better at small throttle openings. A disadvantage of the split-single is that, for only a marginal improvement over a standard two-stroke single, the "Twingle" has a heavier and costlier engine. Since a manufacturer could produce a standard twin-cylinder two-stroke at an equivalent cost to a Twingle, it was perhaps inevitable that the latter should become extinct.〔(Sammy Miller Museum ) Split-single torque and economy rival that of a four-stroke.〕 There have been "single" (i.e. twin-bore) and "twin" (i.e. four-bore) models.〔http://books.google.co.uk/books?id=7bGuud7_uy0C&pg=PA1934&lpg=PA1934&dq=puch+split+motorcycle&source=web&ots=V5p8cebHiC&sig=AUn0rwxDmpCTXhDKAEeNFT0c7lw&hl=en&sa=X&oi=book_result&ct=result&redir_esc=y#v=onepage&q=puch%20split%20motorcycle&f=false〕 Unusually for a motorcycle engine, some Twingles have the carburettor mounted on the front of the engine, beneath the exhaust. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Split-single」の詳細全文を読む スポンサード リンク
|