Re: oil mix

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Posted by Chinewalker ( on September 03, 2004 at 14:18:53:

In Reply to: Re: oil mix posted by Dean Evans on September 03, 2004 at 13:32:18:

Hi Dean,
The Johnrude 4s (up to 1978 or so) have aluminum rods with bronze bearings in them and when one of those crankpin/rod journals starts to heat up they bust the rods and then the crank will toss them right through the crankcase. There's only one steel bearing in the whole motor at the top main. All four other crankshaft bearing points are old-school and need old school oiling. The newer oils buy you an upgrade from 24:1 to 32:1, but that's as far I would go with it...
- Scott

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