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Cylinder Bore and Surface Finish
Based on six years of production experience, honing is not
necessary for the Mercosil 2-cycle application with a
thermostat when TCW-3 oil is used with a regular unleaded
gasoline. Diamond boring Mercosil to a 20 microns RA max.
surface finish is sufficient. In this two-cycle application, the
thermostat insures that condensation on the bore surfaces will
not occur while the TCW-3 oil insures that oil of good film
strength is being used. The absence for the need to hone a
pattern into the bore is significant because it is the general
practice to hone a pattern into the bore to hold the lubricant.
However after 1000 hours of running the “as bored” surface,
it has the topography of a honed and etched bore.
Significantly, when the as-bored Mercosil bore is honed and
Osborn brushed, the Mercosil bore outperforms the chrome
plated bore in the 30% kerosene test and the 4-Stroke oil test.
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