What are my options as far as cylinder bores are concerned – chrome, steel, etc.?
A. This question must be answered on an engine model by model basis. All W670 Continental and R680 Lycoming engines originally utilized steel bore cylinders. Steel cylinders are still an option for these engines, though many operators are switching to some type of chrome cylinders to avoid the rust problems inherent with steel cylinders. During WWII when these engines averaged several hours per week, rust was not a problem, but today’s operator might only average 25 or 50 hours per year. In this case it is not unusual to see rust form on the cylinder walls with a resultant loss of compression and increase in oil consumption. Steel cylinders do have a strong advantage in that the cast iron piston rings readily seat into steel bores. As to chrome bore cylinders, there are basically three options: Channelchrome or one of two newer chrome processes (Nuchrome or Cermichrome). Channel-chrome, developed around WWII, is a hard chrome process, which has a cracked appearance (looks like a dry la
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- What are my options as far as cylinder bores are concerned – chrome, steel, etc.?
