Figure 4. The oxidation catalyst is an essential safety device, burning unburnt gas in the exhaust.

　

The lean-burn engine with computerized port admission and prechamber according to Figure 5 is promoted for marine applications by the author's company only under certain conditions:

・The engine must be equipped with active misfiring detection.

・Special long lifetime spark plugs must be used.

・Special attention shall be paid to the engine compartment; preferably the engines should be deck-mounted.

　

Diesel-electric propulsion of comparatively small vessels could be a likely application of lean-burn gas engines.

　

　

Figure 5. The lean-burn engine concept with port admission of the gas and computerized control of gas amount and ignition is the base for a safe marine gas engine.

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