Evolution Engines EVOE33GX - Manual (Page 9)

EN
9
Fuel
This engine requires a mix of 20:1 gas to oil
lubricant ratio for break-in and a mix of 32:1
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 oper-
ate properly.
Do not go higher than a 20:1 gas/oil ratio
for the first gallon of fuel. After this you may
decrease the oil content to a 32:1 gas/oil ratio
if desired. Do not go higher than a 32:1 gas/
oil ratio or the warranty on your engine will be
voided. To properly mix the fuel, for a mix of 20:1 gas
to oil, add 6.75 oz of good quality 2-stroke
oil to one gallon (or 53 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. Do not use Amsoil synthetic oil in
any form.
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
amount of fuel that is being used by this
engine, filtration of the fuel is mandatory in
three different spots in the system:
1. Between the fuel jug and the airplane fuel
tank.
2. Within the fuel tank itself (with a filtered
clunk EVOA112).
3. Between the fuel tank and carburetor (with
an in-line fuel filter EVOA111).
Both of these filters (2 and 3) are included in
the engine package.
Tank Choice and Construction – Choose a
tank between 12–18 oz (360–540 mL). These
tanks will yield 12 minutes (for the smaller
tank) to 18 minutes (for the larger tank) of full
throttle flying time.
• Ensure you use a tank stopper made for
use with gasoline and/or smoke oil.
• We suggest a three-line tank system; one
for the line to the carburetor with the clunk
attached internally, one for the vent line
from the tank, and one dedicated to fuel-
ing/defueling the tank. We try to avoid the
T-fittings and other inline valves because
they can be a possible source of air/fuel
leaks.
Filtered Weight
Gasoline-resistant
Rubber Cap
Fuel Tank
Vent Tube
Fueling Tube
Gasoline-resistant Tube
Gasoline-resistant Tube
Carb Nipple
Fuel Filter
• Ensure you use the provided FPM tubing in
all the plumbing of the tank, externally and
internally.
• Ensure you use the included felt filter clunk
inside the fuel tank.
• Ensure you use the included inline filter
between the tank and the carburetor.
• 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.
Fuel Delivery System