正彥439 wrote:
在漫畫機車一族有看過...(恕刪)
是....OHC吧?
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http://www.yamaha-motor.jp/mc/lineup/sportsbike/sr400/cafe/engine/index.html
令人佩服的機械文明!
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yj_philip wrote:
這就是使用用途上的不...(恕刪)
旁側閥應該是Side Valve (SV)
OHV, OHC, DOHC都是頂置閥喔
而且OHV體積應該會較小
Overhead valve (OHV) engines have specific advantages:
Smaller overall packaging — because of the camshaft's location inside the engine block, OHV engines are more compact than an overhead cam engine of comparable displacement. For example, Ford's 4.6 L OHC modular V8 is larger than the 5.0 L I-head Windsor V8 it replaced. GM's 4.6 L OHC Northstar V8 is slightly taller and wider than GM's larger displacement 5.7 to 7.0 L I-head LS V8. The Ford Ka uses the venerable Kent Crossflow OHV engine to fit under its low bonnet line.
Less complex drive system — OHV engines have a less complex drive system to time the camshaft when compared with OHC engines. Most OHC engines drive the camshaft or camshafts using a timing belt, a chain or multiple chains. These systems require the use of tensioners which add some complexity to the engine. In contrast a OHV engine has the camshaft positioned just above crankshaft and can be run with a much smaller chain or even direct gear connection.
----摘自Wikipedia
