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A four-stroke cycle is behind lower operating costs of any Alco engine. When you specify or buy any marine engine, one big choice is basic engine design: two-stroke cycle vs. four-stroke cycle. For marine use the Alco four-stroke cycle has key advantages. The intermediate non-firing stroke improves cooling and lubrication of the engine. You get improved fuel economy. With better cooling, there is measurably lower thermal stress and so reduced wear. And the non-firing stroke helps put a better oil film on wrist pins and crankshaft bearings to help reduce wear in these critical areas. To further lengthen life, every Alco four-stroke cycle engine is conservatively rated. It's so rugged you can anticipate up to 25,000 hours' operation or more before overhaul. And it is so tough it passes severe high shock and endurance Navy tests. They are proven profit performers. For the full story on Alco marine diesel engines from 675 bhp @ 720 rpm to 4000 bhp @ 1100 rpm, write Alco Engines Division, White Industrial Power, Inc., Auburn, N.Y. 13021. ALCO The most profitable marine engine in its class. Subsidiary of White Motor Corporation November 15, 1971 15
