Four Stroke Diesel Engine Model Science Labs Hoverlabs is Manufacturer, Exporter Supplier of Four Stroke Diesel Engine Model Technical Description A model of four stroke water -cooled diesel engine. This is of the chain-driven overhead camshaft type and all functional components like camshaft, rock-arms, tappets etc. are clearly demonstrated. The functioning of fuel injection system is also represented. Ignition is shown by means of a miniature bulb, Mounted on base..