RE: Oil Test Summary by rc bugman
Belray H1R mixed at 32:1, gas is 93 octane.
The engine was started and tuned slightly rich as in past tests. The engine
temperature soared to 235-240 degrees within 5 min of running. The mixture
was richened a bit more and the engine temperatures dropped back into the
220 degree range for the remainder of the run. However, the engine burned
the 3 gal of fuel in 5.25 hrs compared to a small amount of fuel remaining
after 6 hrs of run time. Outside temperature was 42-48 degreed F. Engine
rpm with a 24 x 10 prop was 5900.
After 5.25 hrs of running at full throttle, there was almost no carbon on
either the piston or within the dome of the cylinder. The little bit of
carbon present on the piston was two small spots in front of the boost ports
close to the piston edge. The carbon was black and very soft. Otherwise, the
piston was shiny clean. The cylinder dome was also shiny clean. This is the
best looking oil tested to this point with lots of oil throughout the engine
and no carbon buildup.
This mix requires about a 15% increase in fuel consumption.