Re: oil mix


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Posted by Chinewalker (64.19.74.247) on September 03, 2004 at 11:17:34:

In Reply to: Re: oil mix posted by Dean Evans on September 03, 2004 at 10:39:50:

Hi Dean,
I beg to differ in your recommendation of 50:1 in all post 1940 outboards. I have a pile of holed blocks that say otherwise. Most of them are babbit bearing type motors like the 1950s Johnrude 3-7.5 models, but they also include many of the later 4hp Johnrude twins up into the 1970s. The bronze bearings NEED extra oil to keep working properly. Yes, the oil has improved, but the oil VOLUME acts as a cushion on the bronze bearings and that film must be there to keep the motor working for another generation.

So, for the '69 4hp, I would richen up the oil a bit to 32:1, still using the TCW3 rated oil and mid-grade pump gas. If you'd like to add another holed block and scorched crankshaft to my pile, feel free to run it at 50:1....

- Scott


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