RC Engine Coating
Engine Coating Test
Zenoah 26cc, gas, magneto ignition
OS 65 LA ABC, glow plug ignition
Picture shows inside light green coating that can handle heat to 2000 degrees. It controls heat; keeping it in the exhaust pipe, exhaust port, and muffler, where it belongs. On shut down it aids in cooling. Outside is titanium colored heat dispersing coating. This keeps the heat in the muffler. Also aids in fast cool down in shut down. Makes clean up easy, as residues don’t stick.
The gold ceramic coating on the top of the piston keeps the heat from building in the pistons so hot expansion gases make more power pushing down rather than exporting in piston. The outside friction and heat reducing coating wears instead of the piston. It does not peel or flake. It is compatible with alcohol and nitro. The underside also disperses heat and sheds oil.
The gold ceramic coating is also used in the combustion chamber to keep the heat from going into the head, letting hot gases push piston down. This controls heat to gain power. The black outside coating is a heat dispersing material that helps the fins work better in removing heat from the cylinder. The exhaust port ID coating is the same as the muffler holding the heat in the port, not absorbed into cylinder. The intake coating is a gray oil shedding slick material used to increase air speed in the intake track for better cylinder filling. The cylinder wall was coated with a powder to lubricate and seal the piston ring. Powder aids in the lubrication of all parts.
We took a new Zenoah 26cc engine out of the box for our test. We used the larger of the recommended props 18/6~10. During the test we realized that we should have used the smaller recommended prop, which would have shown a higher RPM. We couldn’t turn back so we stayed with the 18/6~10 prop. 92-octane fuel with Castrol 2 cycle oil 40-1 was used. After a proper tune-up the engine turned at 5700 RPM. The spark plug electrode had a nice burn line at the elbow and the porcelain was just off white.
The engine was torn down and the coatings applied. It was then reassembled. Using the same fuel and tune-up, running the same amount of time for break-in, the engine was then tested. The engine showed a touch rich so we turned in the high-speed jet slightly. The plug looked the same after this adjustment. The results were 6030RPM. Showing at times 6060 to 6080. The test was done at the same time of day for the same amount of light for the tach. The weather conditions were close to the same.
It was noted after shut down that the muffler cooled off after a few minutes. You could hold it in your hand. The cylinder was cooling off while the crankcase was still holding the heat. At this time the engine would be easy to work on, without burning your hands.
The same coatings were used on the OS65 LA ABC engine. The bushing was also coated. A 12/8 prop was used for break in and testing with Omega 15%Nitro 18% oil fuel. Out of the box it tested at 11,000 RPM. After coatings it tested at 11,550 RPM. Because the ABC engine has no ring, the RPM settled at 11,400 as the coating on the piston settled in.
The engines were disassembled after the testing. There was no scuffing or galling. The coating material was still intact with no peeling or flaking,
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Yancer Specialty Inc. 520-568-3511 Phoenix, AZ