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16:1
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16:1 for sure. Ignore all the hype about “today’s oils being so much better, you need less” on this engine. This engine has “plain bronze” rod bearings that require alot of lubrication. If the rods don’t get the lube they crave, you will end up pitching a rod probably through the side of the block. The great thing about these engines is when they are in good tune, they hardly smoke at all, even at 16:1
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1/2 pint of oil for each gallon of gas, or 16 to 1. This is also true of most OMC engines from the 40’s and 50’s. My 1955 Johnson 5.5 takes a 16:1 per the cowling instructions, and I would think that this would also be true of the ’57. Running a lean oil mixture will cause more damage to the motor than the lack of smoke will benefit.
"If you lack the knowledge, use intuition. If you lack intuition, use the AOMC website"
2 1925 ELTO Ruddertwins
1940 Evinrude Sportsman 2hp
1941 Evinrude Sporttwin 3.3hp
1941 Sears/ Kissel Waterwitch 571.35 1hp
1945 Neptune model 15B2 2 hp
1955 Johnson CD-12 5.5 hp1 user thanked author for this post.
My ’55 had Champion J6C spark plugs on it, which is around 0.02 to 0.03 inch gap.
"If you lack the knowledge, use intuition. If you lack intuition, use the AOMC website"
2 1925 ELTO Ruddertwins
1940 Evinrude Sportsman 2hp
1941 Evinrude Sporttwin 3.3hp
1941 Sears/ Kissel Waterwitch 571.35 1hp
1945 Neptune model 15B2 2 hp
1955 Johnson CD-12 5.5 hp1 user thanked author for this post.
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