Introduction – Evolution Engines EVOE33GX User Manual
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Introduction
Congratulations on your purchase of one of the exciting new engines in the Evolution
®
gas
engine series. All of the Evolution brand gas engines have been painstakingly designed and
tested to ensure a hassle-free experience without giving away anything in expected performance
or durability and are backed by a 2-year limited warranty. This manual, when read and followed,
will guide you through the simple steps to your success. Welcome to the Evolution family.
33cc Gas Engine Design
Starting with our already proven glow engines enjoyed by thousands around the world, we
endeavored to take that excitement and experience into the realm of gasoline fuel to provide
you with a complete package; great performance and low cost of operation.
Step 1 Start with a ‘clean sheet of paper’. This is a completely new engine designed as a
powerhouse for your 20–30cc aerobatic and scale airframes. We kept ease of use
and reliability at the forefront of the design process to ensure an excellent operating
experience.
Step 2 Utilize a known and proven Walbro carburetor system that will be reliable and provide
hassle-free use by the owners, and add the appropriate throttle and choke levers that
simplify the engine control and installation.
Step 3 Design the proper muffler system with appropriate volume and muffler orientation that
allows a great looking installation while providing appropriate noise reduction.
Step 4 Design operating accessories that enhance the “new to gas (petrol)” user experience.
• Because the amount of fuel consumed is one third that of a comparable sized
glow engine, the construction and reliability of the fuel delivery system to the
carburetor becomes three times as critical. Microscopic pieces of dirt that used
to safely pass through the larger fuel passages of a glow carburetor will wreak
havoc on a gasoline system. By using a quality inline filter like our Inline Filter
(EVOA105) we can take care of the dirt problem. One of these is included with
your engine.
• The same holds true for air bubbles from the tank or any small leak in the fuel
tubing; what would pass harmlessly through a glow carburetor simply is not tol-
erated in a gasoline system because the air bubbles are effectively three times
the size they used to be. We have developed and sourced an excellent felt filter
clunk that, when used in the tank, stops all the air bubbles from moving into the
fuel delivery tubes. This felt clunk is critical to successful and reliable operation.
One of these is included with your engine.
• We found that high muffler temperatures would destroy normal Tygon
®
tubing
(the go-to choice for gasoline engines) within minutes. We found that Neoprene
tubing would withstand the temperatures but it tended to degrade quickly in
use. We sourced the proper sized fluoroelastomer tubing (FKM tubing), which
withstands not only the high temperatures, but its durability is much greater
than that of either Tygon or Neoprene. The added bonus is that it fits and holds
well to the fuel fittings without any need for additional wire or tie-wrap keepers.
We have included a supply of this tubing with your engine.