Instruction manual
EN
4
Introduction
Congratulations on your purchase one of the exciting new engines in the Evolution
®
small block
gas engine series. All of the Evolution brand gas engines are designed from the start to provide
you with excellent performance at a fraction of your previous operating costs. We have painstak-
ingly designed and tested each engine to insure a hassle-free experience without giving away
anything in expected performance or durability. This manual, when read and followed, will guide
you through the simple steps to your success. Welcome to the Evolution family.
Small Block Gas Engine Design
Starting with our already proven glow engines enjoyed by thousands around the world, we en-
deavored 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 great engine. The Evolution glow engines have provided thousands of users
excellent performance.
Step 2 Design a new carburetor system that will be reliable and provide for hassle-free use by
the owners. This new carburetor, with already proven technology, was modified to fit in
the available space in front of the cylinder and the unique needs of a gasoline fueled
engine. Built on to the front of the carburetor is a crankcase-pressure driven regultar
system. This system takes fuel from a muffler pressurized tank and meters it properly in
all attitudes of flight. A new cat’s eye style fuel metering system was added to allow for
more controllability to the low and mid-range throttle positions.
Step 3 Design the proper muffler system to handle the extra heat and expansion of the burnt gas
mixture when compared to a glow system. These changes included adding volume to the
muffler, including a much larger muffler through bolt to handle the heat and stress, and
enlarging the outlet of the muffler to minimize backpressure while still providing noise
reduction.
Step 4 Design operating accessories that enhance the user experience. During our extensive
2 1/2-year testing program we discovered a lot of new techniques and obstacles that are
unique to gasoline fueled small block engines.
• 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 mufer 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 uoroelastomer 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.