™
Operator’s Manual for BT-50EI
SPECIFICATIONS
Displacement: |
2.84 cu in [46.5cc] |
Horsepower: |
5.2 hp @ 9,000 rpm |
Ignition Style: |
Electronic Ignition System |
RPM: |
1,100 – 9,000 rpm |
Fuel: |
Gas/2-cycle engine oil |
Weight w/muffler: 4.8 lb [2.18kg]
Manufactured by FUJI-IMVAC INC.
YOKOHAMA, 235-0005 JAPAN
Worldwide Distributor (except Japan): Hobbico, Inc.
Champaign, IL 61826 USA
www.fuji-imvac.com
Fuji-Imvac is not related to the original Fuji Engines sold by Mecoa.
SAFETY TIPS AND WARNINGS
·Always use a balanced spinner and a balanced prop. An unbalanced spinner and prop 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 prop on the engine to prevent it from being thrown off the engine while running.
·Never use a prop 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.
·Keep onlookers away from the running engine, especially small children.
·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 attacked by the fuel. Use vinyl or neoprene rubber fuel line.
·Always secure the fuel line away from the cylinder head. The engine’s heat can damage the fuel line.
·Never touch the engine after a run. The engine will be hot and it may burn you.
·Before transporting your model, remove all the fuel from the fuel tank and fuel lines.
·Always use high-quality oil intended for 2-stroke engines.
·Use only low-octane, alcohol-free gasoline. The carburetor diaphragm will gradually deteriorate if you use gasoline with alcohol (ethanol, gasohol, etc.). You will need to replace the diaphragm in about 80 hours of operation if you use gasoline with alcohol.
·Muffler pressure to the fuel tank is not required.
·Do not install your throttle servo or kill switch servo inside the engine compartment. Doing so could cause radio interference. Install all electronic radio devices at least 305mm [12"] away from the engine. The throttle pushrod should be non-metallic.
·In case 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.
·Because the carburetor is 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 engines 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.
·If you intend to run this engine on an engine stand, or on any other rigid mount, use rubber mounts. The crankcase and other parts of the engine may crack if you do not provide some kind of vibration absorption mechanism. A rubber mount is not necessary if the engine is mounted on a model airplane.
·Do not operate the engine in a closed room or where ventilation is not adequate.
·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 a kill switch that can be operated both manually and with the R/C transmitter.
PARTS LIST
BT-50EI Engine |
(2) |
6 x 65mm Muffler SHCS |
Ignition Module |
(4) |
5 x 22mm SHCS with Lock |
62.5mm EIS Propeller Flange with |
|
Washers and Washers |
Propeller Washer |
280mm of Gas Tubing |
|
8mm Propeller Bolt |
Spark Plug Wrench |
|
Muffler |
4mm Allen Wrench |
|
Muffler Gasket |
|
|
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FEATURES
·Automatic Ignition Timing: The BT-50EIS features an electronic ignition system that advances the ignition timing as the engine rpm increases. This ensures a delayed ignition timing at low rpm for easy starts and good low-end engine performance, and advanced timing at high rpm for good high-end power.
·The ignition module is waterproof.
·The ignition module runs on any 4.8V battery. The current consumption is approximately 188mAh.
·An optional Digital Tachometer (FJIG9920) is available to monitor rpm and ignition battery voltage.
SPARK PLUG
The recommended spark plug is a Champion RCJ-6Y or 7Y. To avoid improper operation or possible engine damage, do not use any other type of spark plugs. The plug gap should be 0.4mm to 0.6mm [0.016" to 0.024"]. If the plug gap is incorrect, adjust it with a spark plug gapping tool, wash it with gasoline and allow it to dry completely before you reinstall the plug in the engine.
Note: If you want to check if the spark plug works, remove the spark plug from the engine, connect it to the coil and make sure the metallic threaded end of the spark plug touches the engine. Spin the propeller rapidly through top dead center and check for a spark. This procedure only works in a dark room as there is too much light outside to see the spark.
The various spark plug manufacturers have much information on their web sites regarding spark plug performance and health. For more information, check:
http://www.championsparkplugs.com/sparkplug411.asp
PROPELLER
Always use a well-balanced, high-quality propeller.
The recommended propellers are:
High Performance Wood Prop: 18" X 8" 18" X 10" 20" X 10"
Carbon Prop: |
20" x 12" |
|
22" x 10" |
|
22" x 12" |
During our tests, our Fuji-Imvac BT-50EI turned a Bolly 20" x 12" carbon prop at 7600 rpm.The engine was new with 90 minutes of breaking in. The test conditions were: Temperature 10°C [50°F], humidity 40%, elevation at sea level. Performance may vary depending on atmospheric conditions.
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OIL
Fuji-Imvac has developed a special oil to work with their engines.This oil is of extremely high-quality and it has exceptional lubricating properties. This oil can be mixed with gasoline at much higher ratios than other engine oils which allows the engine to develop more horsepower and last longer. It is recommended that you use Fuji-Imvac oil with all your Fuji-Imvac engines. Break-in procedures are slightly different than those when using standard oils. Please refer to the table below for oil contents. Fuji-Imvac Oil bottles of different sizes are available from your Fuji-Imvac distributor or hobby shop.
·Break-in (Stage 1): 1 gallon of gasoline with 50:1 (2%) oil content.
·Break-in (Stage 2): 1 gallon of gasoline with 100:1 (1%) oil content.
·Normal running: In un-cowled or well-cooled installations 150:1 (0.65%) oil content.
·In-cowl or poorly cooled installations 100:1 (1%) oil content.
·Do not try to use these engine oil ratios with any other brand of oil other than the Fuji-Imvac oil.
·Do not use the Fuji-Imvac oil with any other brand of engines.
·If you have been running the engine on other oil and wish to switch to Fuji-Imvac oil, follow the break-in procedure for Fuji-Imvac oil.
If Fuji-Imvac oil is not available, or if you prefer to use a different brand of oil, use the standard fuel/oil ratios as shown below. Never experiment with cheap oil or with obscure brand names. Be certain to select only high-quality oil that is intended for use in gasoline R/C model airplane engines.
·Break-in: 1 gallon of gasoline with 25:1 (4%) oil content.
·Normal running: 40:1 (2.5%) oil content.
PREPARE THE ENGINE
1.Check to see that all screws and bolts are tight. Check carefully for any cracks, broken or missing parts. Tighten or replace before proceeding.
2.Install the prop shaft on the flywheel using three 5 x 22mm SHCS with lock washers and washers. Use threadlocking compound on the screws.
3.Install the spark plug in the cylinder head and tighten.
4. Test fit the muffler and muffler gasket. Use two 6 x 65mm SHCS and washers to hold it in place.
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5.Secure the ignition control module ground wire to the engine using one of the 5 x 12mm SHCS.
6.Connect the ignition control module to the pick up sensor. The connector is polarized and will only plug in one way.
7.Connect a kill switch to the ignition control module. It is recommended to install a manual switch and a servo operated switch. This can be accomplished using two receiver ON/OFF switches.
8.Connect the ignition module battery. Any 4.8V, 500mAh and above battery will work well for this. The approximate current consumption of the ignition switch module is 188mAh.
INSTALLING THE FUJI-IMVAC BT-50EI ON YOUR AIRPLANE
Note: The Fuji-Imvac BT-50EI must be installed on a 12mm [1/2"] lite ply firewall or on a 9.5mm [3/8"] birch ply 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 Fuji-Imvac BT-50EI onto a firewall thinner than specified because it may fail due to the power of the engine.
Note: The length of the engine from the back on the engine mount to the propeller washer is 166mm [6.5"] when using the stock (62.5mm [2.46"]) prop flange.
1.Use the supplied template (on the back cover of this manual) to drill the engine mounting bolt holes and the necessary clearance hole on the firewall.
2.Install the engine on the firewall using four 6.4 x 32mm or 1/4" x 1-1/4" socket head cap screws, four 6mm [1/4"] flat or lock washers and four 6mm [1/4"] blind nuts. Use some threadlocking compound, such as Great Planes® Pro™ Threadlocker (GPMR6060), on the screws.
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