- This topic has 30 replies, 14 voices, and was last updated 2 years, 6 months ago by
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The section of a bearing that is under pressure
as a motor runs has the thinnest film of oil.
There is only room for so much oil there no
matter how much you mix in to fuel. Once you
have enough to prevent contact, there is no
benefit to adding more. Then there is friction.
The slicker the oil the less wear. You see it’s
the friction of the oil as the components rotate
that wears away the metal. Just as water does
running over a stone. It’s the same for the rings.
For me it’s the quality that will reduce wear
resulting in longer engine life. Others obviously
see it differently.
…feed that journal with premix…50/1 verses 16/1 on a plain bearing….not my motor…roller elements 50/1 is fine. With a high silicon piston skirt 50/1 is okay when things are perfect. Early pistons were soft and need 16/1.
I understand the gas flashes off leaving the oil film. 50/1 is not enough oil for a non-pressure fed plain bearing. 50/1 was a boardroom decision for sales. The newer crowd sees an oil cloud they assume the motor is worn out like a 4 stroke.
The very first week of getting my 4 year in mechanical the prof says any product that lasts too long is a product failure…and products are designed to make investors money but that’s another issue..
…and keeps operators from running slightly rich for safety. Every fixed jetted carb motor I have received I go one hotter plug and jet to that. The folx on the chainsaw forums understand this. Manufactures have no incentive to make their products live much past warranty period. By running short on oil and slightly lean this is accomplished.
The only 4 stroke outboard I have owned from new was jetted too lean for optimum operation also. Most carbed 4 strokes of today are jetted slightly lean …especially the low speed jet.
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