Re: 24:1 vs 50:1 in 64′ vs 65′ OMC engines

Home Forum Ask A Member 24:1 vs 50:1 in 64′ vs 65′ OMC engines Re: 24:1 vs 50:1 in 64′ vs 65′ OMC engines


frankr

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#81215

I heard it Straight from an Evinrude engineer’s mouth. "We just found out that they didn’t need as much oil as we thought they did". Seriously, the change to 50:1 came with the introduction of Evinrude/Johnson 50:1 oil in 1964. Scott-Atwater was already marketing 100-1 at the time. So yes marketing pressure did have something to do with it. Somebody will correct me if I’m wrong, but I think Mercury 50:1 came later.

Yeah, you can run 50:1 TC-W3 in your 28-33hp motors. Somebody is sure to argue on that.