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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
dr oil duties ?
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[QUOTE="Jaybird, post: 1215763, member: 22283"] OK...this is simply my take on this. Our bikes don't hold much oil to begin with. Normally most dirt bikes will hold less than a full quart. The small volume of fluid has a great load placed on it, especailly when used in a four stroke bike that requires the lubricant to protect both the clutch pack as well as the engine components, such as valves and bearings. When a big load is placed on engine oil, it tends to shear it down. Meaning the action of the engine parts, like gears meshing and metal components sliding on one another, causes the oil to be thinned out to a thinner viscosity than it was originally in a very short period of time. This thinning of the oil, and the heat that the small amount of oil sees, places a big demand on the additive package to protect past what the base oil can. And the life of the additive package becomes less and less with more work. The additives can also become depleted due to the oil oxidizing. When the oil starts to oxidize it will become increasingly acidic, and this acidity tends to break down and deplete the add pack, as well as the work does. This is the reason you will hear oil change recommendations containing a time factor as well as a mileage number. Even oil that is doing no work at all can become less and less effective simply by sitting idol in the engine, due to the oil is always degrading and the acidity is always working to break down the oils protecting properties. Another big issue with dirt bikes is that they typically will produce alot of blowby of combustion gasses that can blow past the rings of the piston. And along with carbon, raw fuel can also enter into the oil sump, which dilutes the oil and helps to break it down faster. Workload, heat, contamination (carbon, fuel, and "swarf"), as well as time, are the enemies of engine oil. And the best way to combat these ill effects on the oil, is to change it out on a very frequent basis. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
dr oil duties ?
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