DLE-20
Operator’s Manual
Specifications
Displacement: |
20 cc [1.2 cu. in.] |
Performance: |
2.5 HP / 9,000 rpm |
Idle Speed: |
1,700 rpm |
Ignition Style: |
Electronic Ignition |
Recommended Propellers: |
14 u10, 15 u8, 16u6, 16u8, 17u6 |
Spark Plug Type: CM6 |
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(Gap) 0.018in.– 0.020 in. [0.45mm – 0.51mm] |
Diameter × Stroke: |
1.26 in. [32 mm] u0.98 in. [ 25 mm] |
Compression Ratio: |
10.5 :1 |
Carburetor: DLE MP 148 100424 with Manual Choke
Weight: Main Engine − 1.43 lb [ 650 g ]
Muffler − 1.76 oz [50 g]
Electronic Ignition − 4.23 oz [120 g]
™Fuel: 87− 93 Octane Gasoline with a 30:1
gas/2- stroke (2- cycle) oil mixture
© 2011 Hobbico®, Inc. |
DLEG0020 Mnl 1.1 |
Parts List
(1) DLE-20cc Gas Engine w/DLE MP 148 100424
(1)DLE Spark Plug (NGK CM6 size) with additional spring
(1)Muffler with gasket
(2)4 x14 mm SHCS (muffler mounting)
(1)Electronic Ignition Module with additional tachometer lead
(1)Silicone Pick-up Wire Cover / Ignition Wire Cover
(1)Red Three Pin Connector Lead with Pig Tail (ignition switch)
(1)Long Throttle Arm Extension with installation screw and nut
(2)Three Pin Connector Securing Clips
(1) DLE Decal (not pictured)
Safety Tips and Warnings
●This engine is not a toy. Please place your safety and the safety of others paramount while operating. DLE will not be held responsible for any safety issues or accidents involving this engine.
●Operate the engine in a properly ventilated area.
●Before starting the engine, please make sure all components including the propeller and the engine mount are secure and tight. It is strongly recommended that a screw sealant is used (Great Planes®Threadlocker GPMR6060) during engine installation.
●During the break-in period, it is recommended that the engine be installed on the aircraft or a test stand with an appropriate shock absorber. Otherwise it is probable that vibration could rebound back to the engine and serious damages may occur during the break-in period.
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●For your safety and the safety of others, please do not stand in front or in line with the propeller when the engine is running. Keep onlookers away from the running engine, especially small children.
●Always use a balanced spinner and a balanced propeller. An unbalanced spinner and propeller combination will cause high levels of vibration and may cause the propeller shaft to break. Always use a lightweight spinner on your engine. Lightweight spinners are considered to be those with a cone wall of 1mm or less. Heavy spinners could cause the propeller shaft to break. Securely tighten the spinner and propeller on the engine to prevent it from being thrown off the engine while running.
●Never use a propeller that has hit the ground. Even though it may look good from the outside, it may be cracked on the inside which may cause it to disintegrate while in use. Do not use a nicked, cracked or split propeller.
●Keep foreign objects away from the propeller. Make sure that nothing can be “sucked in” by the propeller.
●Never start the engine on loose gravel or sand.
●Do not attempt to stop the engine by throwing anything into the path of the propeller.
●Make sure the fuel line is well-secured to the engine and to the fuel tank so that it won’t come off in flight.
●Do not use silicone fuel line because it will be dissolved by the fuel. Use gasoline approved vinyl or neoprene rubber fuel line. Always secure the fuel line away from the cylinder.The engine’s heat can damage the fuel line.
●Never touch the engine immediately after a run.The engine will be hot.
●Before transporting your model, remove all the fuel from the fuel tank and fuel lines.
●Always use high-quality oil intended for 2-stroke (2-cycle) engines. It’s a good idea to use a petroleum based 2-cycle motor oil like Lawn Boy All Season – Ashless, Generation II oil for the breakin period. Break-in should be considered about the first 3-5 gallons you run the engine. A high quality synthetic 2-cycle oil is recommended for optimum performance and a longer engine life. Synthetic 2-cycle oils leave fewer combustion byproducts than natural oil which can foul the engine and exhaust ports, resulting in reduced performance. Synthetic oils also reduce friction and provide more fluidity at low temperatures.
●Do not install your throttle servo or kill switch servo inside the
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engine compartment. Doing so could cause radio interference. |
Install all electronic radio devices as far away from the engine as possible.
●The throttle and choke pushrods should be non-metallic.
●If the engine is not to be used for more than a month, drain the fuel tank and remove any fuel from inside the carburetor. Do this by running the engine at idle until it quits by running out of fuel. Keeping gasoline inside the carburetor over an extended period of time will damage the diaphragm valve and clog passages inside the carburetor. Due to the carburetor being more complicated than those used in glow engines, keep the fuel clean by using a fuel filter. Use a filter intended to be used with gasoline engines. Metal filters intended for glow engine are too coarse and will not screen out finer particles.
●Always filter your fuel by using an appropriate filter before putting it into the airplane’s fuel tank.
●Gasoline is extremely flammable. Keep it away from an open flame, excessive heat or sources of sparks.
●Do not smoke near the engine or the fuel tank.
●This engine was designed for use in a model aircraft. Do not attempt to use it for any other purpose.
●Always install an ignition system kill switch on the aircraft used.
●Caution: Running the engine with a lean gas mixture will cause the engine to overheat and burn the electrode of the spark plug. Pay close attention to the High-speed Needle adjustment. Running the engine with the proper gas mixture will cause the spark plugs to appear yellow at the ignition point.
●For optimum performance please use fresh or recently purchased 93 octane gasoline (87 octane gasoline will suffice) with a 30:1 gas/oil mixture.
GAS/OIL Mixing Chart
1 Gallon Gasoline (128 fl oz/3.78L) / 2-Cycle Oil (4.26floz/125.68ml) = 30:1 ratio
●Excessive running of the engine at idle speed can result in a seriously carbonized spark plug.
●Keep the surface of the engine clean to ensure proper heat dissipation. Ensure proper cooling/ventilation around the cylinder with adequate air exhaust.
●To avoid permanent damage to the electronic ignition system, NEVER rotate the propeller on your DLE engine with the electronic ignition system switched on and the plug not installed in the plug cap.
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Installation Instructions
Prepare the engine for installation
Before beginning installation it’s a good idea to plan location of the various components of the engine. Many of the following steps may need to be completed in a different order than listed.
1. Check to see that all screws and bolts are tight. Check carefully for any cracks, broken, or missing parts. Tighten or replace any damaged or missing parts before proceeding.
2. Install the silicone wire cover over the pick up lead coming from the engine (cut the excess silicon wire cover) and connect the lead to the pick–up lead from the Electronic Ignition Module. Secure the connection with the included three pin connector securing clip.
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3.Connect the kill switch lead to the red connector from the ignition control module using the lead from the kill switch or with the included three pin connector with pig tail. Use one of the included three pin securing clips to secure the connection.
4.Connect the ignition module battery to the kill switch. Any 4.8- 6.0V, 1000mAh and above capacity battery will work well for this. Use heat shrink tubing to secure this connection.
5. Install the ignition kill switch and charge jack on the aircraft so that it is easily accessible from the outside of the plane.
6. Install the ignition module securely in the airplane forward area. It is recommended that a thin piece of foam rubber is placed between the module and the mounting surface and that Velcro® is used to
hold the module in place.
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7.Secure all connections with heat shrink tubing (not supplied).
8.Install the silicone ignition wire cover over the ignition wire.
9.Install the spark plug into the engine head (7-8 lbs torque).
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Switch |
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Ignition Control Switch Wire |
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(Not included) |
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(To On/Off Switch) |
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ELECTRONIC IGNITION
SYSTEM
Charge |
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Tachometer |
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Lead |
Ignition Wire |
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Lead/ |
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RPM |
Optional |
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(To Spark Plug) |
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Signal |
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Battery |
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Tachometer |
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Pick-Up |
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Out-Put |
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Lead |
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(Not included) |
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Sensor Wire |
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(To Sensor On Engine)
Installing the DLE-20 on Your Airplane
Note: The DLE-20 must be installed on at least a 6mm [1/4”] firewall. The firewall must be securely glued to the airplane. Use triangle stock and pin the firewall with hardwood dowels to reinforce the firewall glue joints. Never install the DLE-20 onto a firewall thinner than specified because it may fail due to the power of the engine.
1. Select an engine mount. A two-piece engine mount that does not interconnect or overlap at the firewall is preferred for the DLE-20, like the DubroVibration Reducing Engine Mount 1.20-1.80 (DUBG1307).
2. Before securing the engine mount to the firewall, test fit the engine onto the mount and place the mount onto the firewall. Use this positioning to create an engine mounting template. Use the template to drill the mounting holes in the locations on the firewall. Note: A
Template for mounting the DUBG1307 is provided on the back of this manual. Press the blind nuts into the rear of the firewall. If you
choose to use regular nuts or lock nuts be sure to place washers
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on the bolts before securing the nuts onto the bolts on the rear of the firewall. Be sure to useThreadlocker on the screws holding the engine mount to the firewall.
3.Place the engine on the engine mount and at the recommended distance from the firewall and test-fit the cowling on the aircraft to verify the distance.When you’re satisfied with the engine’s position, mark the location of the four holes on the mount.
4.Remove the engine from the mount. Drill and tap the engine mount at the position of the four mounting holes. Use an appropriate size screw (we used (2)1-1/4” and (2) 1” 8-32 thread SHCS). It’s a good idea to drill and tap all the way through the mounting beams in order to secure each screw with a lock nut.
5.Secure the four screws with lock washers, flat washers, and lock nuts.
Drain/Vent Pressure Relief Line
Route to top-front of fuel tank interior, to prevent siphoning.
Fuel Tank
Supply Line to Carburetor
Clunk Lines
Carb
Fuel fill line 
Plug 
This line must be extended to exit the bottom of the aircraft.
6. Install the fuel tank in the airframe. Use only gasoline-safe fuel lines and a gasoline safe stopper. One line should go to the carburetor and the other is to be used as a vent (a vent line is simply an open ended fuel line from the fuel tank which exits the engine compartment or the fuselage; most vent lines exit at the bottom of the firewall).You can fill the tank by using the carburetor line as fill line if you have access to it or install a third line to be used as fill line. Installing a third line is the cleanest and easiest way to add fuel. An alternative fueling set up is a 2-line system with aT-fitting approved for gasoline use. Be sure to use a filler plug with either a 2 line or 3 line set-up. It is a good idea to add an extension to the vent line as shown, that goes up and to the rear of the tank.This helps to avoid draining fuel from the tank when the model is pointed down.
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