Evolution Engines 62GXI - Manual (Page 4)

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Introduction
Thank you for purchasing the exciting new Evolution ® 62 GXI engine. A first in gasoline RC engines,
the 62 GXI features a throttle body fuel injection system. No longer will you have to deal with
needle valve settings and tuning your engine. The 62 GXI automatically manages fuel metering,
letting you worry about more important things like flying! Mounting the 62 GXI is simple with the
overall dimensions designed to fit current giant-scale offerings. Because its prop, muffler, and
mounting dimensions match other popular 50cc and 60cc engines, the 62 GXI is a drop-in fit for
many existing 50 –60cc airframes.
62cc GXI Gas Engine Design
Building upon our proven small block gas engines, the 62 GXI takes ease of use and reliability to
the next level.
Step 1 Start with a ‘clean sheet of paper’. This is a completely new engine designed as a
powerhouse with user-friendly qualities for 50–60cc airplanes. Making the engine
powerful, reliable and easy to operate were key design considerations.
Step 2 Design a new throttle body fuel injector system around this engine. Fuel injectors have
never been used on gasoline RC engines, although they have become standard for other
industries like the automobile industry. Bringing this technology to RC engines enables
flyers to enjoy more flying time with less hassle.
Step 3 Include an effective, wraparound style in-cowl muffler with the engine so flyers won’t
have to source a muffler before they can fly.
Step 4 Design operating accessories that enhance the gasoline engine experience.
• The construction and reliability of the fuel delivery system to the fuel injector is
critical. Microscopic pieces of dirt will wreak havoc on the injection system. The
included Sintered Plastic Filter Clunk (EVOA121) takes care of the dirt problem.
It is mandatory to use the included filter to ensure trouble-free operation.
• The same holds true for air bubbles from the tank or any small leak in the
fuel tubing; even small bubbles are simply not tolerated in this system. The
included filter and tubing ensure no air bubbles affect the system.
• We found that popular gasoline fuel tubing has its weak points. Normal
Tygon ® tubing (the go-to choice for gasoline engines) does not withstand high
temperatures well and tends to get stiff and brittle with use, and Neoprene
tubing tends to swell with exposure to gasoline. Swelling will eventually lead
to the fuel line slipping off if the line is not secured with a wire tie or similar.
Viton
® tubing 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 recommend you purchase Viton tubing for optimal
performance.