20GX2
Evolution® Gas Engines
NOTICE
All instructions, warranties and other collateral documents are subject to change at the sole discretion of Horizon Hobby, LLC. For up-to-date product literature, visit horizonhobby.com and click on the support tab for this product.
Meaning of Special Language
The following terms are used throughout the product literature to indicate various levels of potential harm when operating this product:
NOTICE: Procedures, which if not properly followed, create a possibility of physical property damage AND a little or no possibility of injury.
CAUTION: Procedures, which if not properly followed, create the probability of physical property damage AND a possibility of serious injury.
WARNING: Procedures, which if not properly followed, create the probability of property damage, collateral damage, serious injury or death OR create a high probability of superficial injury.
WARNING: Read the ENTIRE instruction manual to become familiar with the features of the product before operating. Failure to operate the product correctly can result in damage to the product, personal property and cause serious injury.
This is a sophisticated hobby product and NOT a toy. It must be operated with caution and common sense and requires some basic mechanical ability. Failure to operate this Product in a safe and responsible manner could result in injury or damage to the product or other property. This product is not intended for use by children without direct adult supervision. Do not use with incompatible components or alter this product in any way outside of the instructions provided by Horizon Hobby, LLC. This manual contains instructions for safety, operation and maintenance. It is essential to read and follow all the instructions and warnings in the manual, prior to assembly, setup or use, in order to operate correctly and avoid damage or serious injury.
CAUTION: This product can become extremely hot when in use, which could lead to burns.
Age Recommendation: Not for children under 14 years. This is not a toy.
Safety Warnings
Model engines produce a substantial amount of power, which can create unsafe situations if not used correctly. Always use common sense and observe all safety precautions when operating, handling or performing any procedure involving your engine. Failure to follow safety precautions could result in serious injury and property damage.
•Always ensure spectators, especially children, are at least 30 feet away when running the engine.
•Always ensure that the propeller is securely attached to the engine shaft and all retaining fasteners are tightened properly before EACH flight. Use of blue threadlock to tighten nuts is advisable.
•Always keep small parts out of the reach of children as they can be choking hazards.
•Always secure the airplane before powering the engine.
•Always keep your face and body away from the path of the propeller blades when starting or running your engine.
•Always stand behind the propeller when making carburetor adjustments.
•Always wear safety glasses or goggles when starting and running your engine.
•Always keep your fuel in a safe place away from sparks, heat or anything that can ignite.
•Always ensure the aircraft is secure and will not move once the engine is started.
•Always rebind your transmitter to your receiver(s) after setup and before first flight.
•Always ensure the throttle failsafe is set to low throttle in your transmitter.
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•Always perform a range check prior to flight.
•Always use the throttle linkage to shut off the air or turn off the engine power switch to stop the engine.
•Never use hands, fingers, or any other body part to stop the propeller.
•Never throw any object into a propeller to stop it.
•Never run the engine in the vicinity of loose small objects, such as gravel or sand, to avoid the propeller uncontrollably throwing such materials.
•Never wear loose clothing or a loose neckstrap when operating your model engine as these items could become entangled in the propeller.
•Never have loose objects such as screwdrivers, pencils, etc. in your pockets when operating your model engine. These could fall into the propeller.
•Never allow fuel to come into contact with eyes or mouth. Gasoline and other fuels used in model engines are poisonous.
•Always ensure gasoline and fuel are stored in a clearly marked container away from the reach of children.
Precautionary Guidelines
•Always mount the engine securely on a bench mount or high-quality engine mount.
•Always use the correct size and pitch of propeller for your engine. Refer to the Propeller Chart in this manual.
•Always confirm proper balance of your propeller prior to installation of the engine. Failure to do so could result in damage to the engine and/or airframe.
•Always utilize an electric starter to start your engine.
•Always discard any propeller that is nicked, scratched, cracked or damaged in any way.
•Always run your model engine in a well-ventilated area. Model engines can produce possibly harmful carbon monoxide fumes.
•Always store your fuel safely in a sealed, water-resistant container.
•Always store fuel in a cool, dry location. Do not allow fuel containers to come in direct contact with concrete, as the fuel may absorb moisture.
•Always responsibly discard fuel if there is condensation and/or water inside the fuel container.
•Never return unused fuel from the fuel tank back into the fuel container.
•Never attempt to repair or modify a propeller beyond its intended use.
•Never handle model engines, mufflers and/or tuned pipes until they have had time to cool. They can become extremely hot when in use.
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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 painstakingly designed and tested each engine to ensure 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 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 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 onto the front of the carburetor is a fuel-pressure regulator. On the back of the carburetor is a new crankcase-driven pump. This pump helps maintain constant fuel pressure as well as draw fuel to the carburetor. 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. We decided to include an inverted wraparound muffler that would make a more compact and clean installation. We also repurposed the fuel pressure nipple and utilized this for a smoke inlet for those users who would like to have smoke on-board their airplane. The new dual exhaust outlets provide a deeper yet quieter sound.
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.
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 tolerated in a gasoline system because the air bubbles are effectively three times the size they used to be. We have sourced an excellent sintered plastic clunk that, when used in the tank, stops all air bubbles in the fuel line as well as filters out any dirt in the fuel system. The included clunk is critical to ensuring successful and reliable operation.
•We found that high temperatures 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 recommend using FKM or Viton® tubing in your fuel system plumbing. FKM tubing is specifically formulated to withstand high temperatures and harsh petrol-based chemicals, such as gasoline.
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Included Content
Engine
EVOA107 |
Evolution®/Spektrum™ Telemetry RPM Adapter Cable |
EVOA121 |
Sintered Plastic Filter Clunk |
EVOG10300 |
Ignition Unit |
EVOG10350 |
Spark Plug |
EVOG20601B |
Muffler |
EVO110E100A |
Muffler Screws & Gasket |
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Optional Items
APC15060 (APC16060) 15 x 6 propeller (break-in) (16 x 6 propeller (normal flight))
EVOA100 |
Optical Electronic Ignition Kill Switch |
EVOA102 (EVOA103) |
Medium Gas-FKM Fuel Tubing 1 meter (3 meters) |
EVOA112 |
Evolution 3 Wire Ignition/Receiver Switch |
EVOX1001Q |
Evolution Synthetic 2-Cycle Oil |
HAN155 |
Ultra Fuel Pump |
HAN156 |
Tachometer |
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C |
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G |
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B |
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D |
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A |
E |
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F |
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A. Spark Plug |
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B. Muffler |
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C. Low-speed Needle |
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D. Throttle Arm |
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E. Fuel Nipple |
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F. High-speed Needle |
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G. Crankcase Pressure Port |
Installing the Engine
1.Secure the engine mount on the airplane firewall. Tighten the engine mount screws in the firewall.
2.Install the engine on the engine mount according to the airplane manufacturer’s instructions.
WARNING: Tighten all engine mounting screws before each flight. If you do not tighten the engine mounting screws, the screws may vibrate loose and cause the engine to separate from the fuselage.
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Installing the Muffler
The muffler mounting accessory package includes mounting screws (2), lock washers (2), muffler gaskets (2) and L- wrenches (3).
1.Put a lock washer on each of the muffler screws. Push the muffler screws through the muffler.
2.Align the muffler gasket with the exhaust opening and the muffler mounting screws.
3.Tighten the muffler screws.
Important: Tighten the muffler screws after the first few tanks of fuel. The muffler screws may loosen from heat and vibration. After the third tightening, no further muffler loosening should occur.
Connecting the Throttle Linkage
11mm
Mid-throttle
1. Use a secure method to attach the throttle linkage to the throttle arm on the carburetor.
2.Power on the transmitter and receiver.
3.Move the throttle stick to the middle stick position.
4.Adjust the throttle arm so the arm is 90 degrees to the throttle pushrod.
5.Center the throttle servo. Install a servo arm with a hole 11mm (7/16 in) from the center of the arm.
6.Use a clevis to attach the throttle linkage to the servo arm.
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