Engine Break-In - Losi EVOLUTION 62GX Mode D'emploi

Engine Break-in

Your engine has been test run at the factory but not fi ne tuned. It needs to be broken-in to ensure
long life of all components. This engine features a ringed-piston design, which requires a specifi c
break-in procedure to ensure a tight seal between the piston ring and cylinder. For this to be
accomplished, this process requires repeated heating and cooling cycles. The ring needs to seat
itself with the cylinder walls for it to develop a good seal.
Important considerations during break-in
• Perform the break-in process with the engine
mounted on your airplane. There is no need
to bench-run the engine prior to mounting it
on your airplane.
Break-in process
• First tank of fuel: Run the engine on the
ground for its fi rst tank of fuel and DO NOT
exceed 4000 RPM. Cycle the throttle between
idle and half throttle every minute.
• Second tank of fuel: Do not run at full throttle
on th e ground for more than 30 seconds at
a time. Fly the airplane and avoid extended
periods of heating the engine. Be sure to
mix in some cooling dives and lower-throttle
fl ying.
Telemetry
Telemetry is a huge asset to help you take
care of your engine. In order to receive RPM
telemetry, you will need to connect the Evolution
Ignition Telemetry Adapter (EVOA113) between
the Telemetry connector on the ignition and the
RPM port on your Spektrum telemetry module.
Telemetry systems other than Spektrum may
require a dedicated RPM sensor.
We recommend using the Spektrum
Range Aircraft Telemetry Module (SPM9548)
in conjunction with the included adapter. This
system allows you to see real-time RPM and
temperature readings from the engine.
• Use a lightly loaded break-in prop to begin
your break-in process (22 x 10 or 23 x 9).
• Use the recommended fuel with a 32:1 gas
to oil ratio.
• Third tank of fuel: Fly the engine at high
throttle settings for longer periods of time, up
to one minute. This will help the piston ring
and cylinder to expand and contract, helping
the breaking-in process.
• Fourth tank of fuel: Select one of the
recommended propellers for normal operation
and mount it on your engine. Continue
to break-in the engine in fl ight. Use high
throttle settings for extended periods of time.
Monitor cylinder head temperatures to avoid
overheating.
The temperature sensor should be wrapped
around the base of the spark plug on the
cylinder head with the thermistor facing towards
the rear of the engine. Using telemetry gives you
an accurate representation of actual temperature
and RPM fi gures during use, and warnings
can be set for temperatures outside a specifi ed
range.
™ DSMX ® Full The temperature range should be 190–290°F
(87–143°C). Set your maximum-temperature
warning at 310°F (155°C). If your engine is
continually near this peak temperature or higher,
immediately decrease throttle to bring the
temperature down.
If this continues to occur, land the airplane
and investigate more effective cooling for the
engine. Often this is accomplished by adding
baffl ing that guides cooling air directly through
the cylinder fi ns. It is not good for the engine to
run at temperatures this high and could cause
damage if not attended to.
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