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Old Marine Engines


One-lunger Marine Engine  
One-lunger Marine Engine This Acadia engine, built in Bridgewater, Nova Scotia, is a classic one-lunger. Its make-and-break igniter mechanism is clearly visible behind the flywheel.

The igniter rod is driven by the crankshaft. When the two parts of the igniter contact each other, a circuit is completed. At the top of the stroke, the contact is broken causing a spark at the igniter points inside the cylinder.

A timing lever is located to the right of the igniter. A drip-feed lubricator is visible, although the engines were typically (and best) lubricated by mixing oil with the gasoline.

This fine Acadia may be seen at the Fisheries Museum of the Atlantic in Lunenburg, Nova Scotia.

Inside of the Acadia  
Inside of the Acadia This cutaway shows the layout of a classic, two-port one-lunger. At the bottom right is the carburetor. The air/fuel mixture enters the base of the engine through a check valve that is pulled open as the piston rises. When the piston descends, the mixture is forced through a transfer port (not seen here) and into the cylinder where a deflector plate on the piston directs it upwards so that it doesn't simply rush out the exhaust port. The red-painted areas indicate where combustion and exhaust occurs. Note the additional air intake port (white) that permits a further adjustment of the mixture. The grease cup feeds the crankshaft bearing and also helps seal the base and maintain compression there for maximum efficiency.

You can read more about Acadia and other such engines in Old Marine Engines.

Palmer  
Palmer This little white-painted Palmer is owned by collector Dick Day and is believed to be the original engine used at boat shows by the company.
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