Evolution Engines 62GXI - Manual (Page 10)

10
Fuel
This engine requires a mix of 32:1 gas to oil
lubricant ratio for break-in and a mix of 40:1
gas/oil ratio for normal operation in order to
last a long time.
The needle bearing at the bottom end of the
conrod depends upon this lube ratio to operate
properly.
Do not go leaner than a 32:1 gas/oil ratio
for the first gallon of fuel. After this you may
decrease the oil content to a 40:1 gas/oil ratio
if desired. Do not go leaner than a 40:1 gas/
oil ratio or the warranty on your engine will be
voided. To properly mix the fuel, for a mix of 32:1 gas
to oil, add 4.0 oz of good quality 2-stroke oil to
one gallon (or 31 mL of oil to one liter) of 87–93
octane fuel. (EVOX1001Q Evolution 2-stroke oil
is recommended) We prefer to add the oil first
to our fuel container and to add the gasoline
second. This helps to ensure a good mixture of
the oil with the fuel at the outset.
We have tested our own Evolution 2-stroke oil,
Valvoline, Shell, RedLine and Husqvarna oils.
Other quality 2-stroke oils should work as well.
Fuel Delivery System
It is very important to properly construct
your fuel supply system to avoid operating
problems. Our experience has shown that
many seemingly engine related operating
problems are in fact fuel delivery problems, not
engine related problems.
fuel filtering
Because of the incredibly small passages in the
injection system, even the smallest impurities
introduced into the fuel delivery system can
cause issues. For that reason, filtration of the
fuel is mandatory in a few different spots in the
system:
1. Between the fuel jug and the airplane fuel
tank.
2. Within the fuel tank itself (with the included
Sintered Plastic Filter Clunk (EVOA121)).
Tank Choice and Construction
Choose a tank with at least 24 oz (700mL)
capacity. A 24 oz tank will yield 12 minutes of
flying time. This engine has a fuel consumption
rate of about 2.2 oz/min (65 mL/min) at full
throttle.
• Ensure you use a tank stopper made for use
with gasoline and/or smoke oil.
• The EFI system requires a three-line tank
system; one for the line to the carburetor
fuel feed port with the sintered plastic filter
clunk attached internally, one for the vent
line from the tank to the outside of the
airplane, and one serving double duty to
fuel/defuel the tank, and act as a return
line from the throttle body. A “T” fitting (like
the one included with the Hangar 9
® Fuel
Filler with “T” Fitting and Overflow Fitting
(HAN116)) is used to connect the fueling
tube to the return line.
Sintered Clunk
Gasoline-resistant Rubber Cap
Fuel Tank
Vent Tube
Gasoline-resistant Tube
Fuel Inlet on
Throttle Body (F)
Fuel Return from
Throttle Body (R)
To Outer Fuselage for Fueling
• Ensure you use the provided Viton tubing in
all the plumbing of the tank, externally and
internally.
• Ensure you use the included sintered plastic
filter clunk inside the fuel tank.
• Ensure there is a good seal system for
the dedicated fueling/defueling line. We
highly recommend the HAN116 Fuel Filler
Assembly for its sleek look and ease of use
when installed on your airplane. This Fuel
Filler package also includes the “T” fitting
required for the tank system as outlined
above.