WARNING – Rcexl ignitions are specifically designed for use in model aircraft ONLY. They are NOT to be used in any Human Carrying Aircraft (or vehicle).
1. Specifications
Single Specifications
BPMR6F 14mm and BMR6A Ignition:
- Input Voltage Range: 4.8-7v
- Output Voltage Range: 12-16 kV
- Maximum Current Draw @ 8000 rpm: 650 mA
- Casing: ABS with Nickel plating
- Single Unit Weight (excluding battery): 4.4 oz
- Twin Unit Weight (excluding battery): 6.1 oz
- Plug Size: 14MM NGK (BPMR6F)
- Warranty: 2 Years
Twin Specificiations
CM6 10mm and ME-8 1/4 32 Ignition:
- Input Voltage Range: 4.8-7v
- Output Voltage Range: 12-16 kV
- Maximum Current Draw @ 8000 rpm: 650 mA
- Casing: ABS with Nickel plating
- Single Unit Weight (excluding battery): 4.4 oz
- Twin Unit Weight (excluding battery): 6.1 oz
- Plug Size: 10MM NGK (CM-6)
- Warranty: 2 Years
2. Selecting a Power Source
There are several power sources that you can use, however the most optimal power source is 6v.
4.8 and 6v NiCd/NiMh Packs
The Rcexl Ignition version 2.0 is rated for operation between 4.8 to 6v, with a maximum limit of 7v. It performs optimally with a 4-cell 4.8v pack or a 5-cell 6v pack, each having a minimum capacity of 800 mAh to ensure a strong spark.
- For optimal performance use a 6v pack. If you choose a 4.8v pack this will reduce the engine rotational speed.
- Voltage regulator – not necessary.
6.4v Li-Fe(A123) Packs
The Rcexl Ignition version 2.0 supports 2-cell Li-Fe(A123) packs with a maximum voltage of 7.2 volts and a nominal voltage of 6.6 volts. A voltage regulator or an IN4007 diode can be used to adjust the voltage as needed. If the engine is not achieving the desired rotational speed, direct use without regulation may also be an option.
- For optimal performance use a 6v pack. If you choose a 6.4v pack this may lead to higher temperatures leading to risk of RFI interference, slowing rotational speed.
- Votage regulator – not necessary
7.4+v Li-Poly Packs
2-cell Li-Poly Packs can peak at voltages exceeding 8 volts when fully charged. To use these packs with the Rcexl ignition, a voltage regulator is essential. Alternatively, you can serially connect two IN4007 diodes to lower the voltage.
- Rcexl ignition operates most efficiently within the range of 4.8-6 volts and draws more current at voltages exceeding 8 volts, leading to higher operating temperatures and an increased risk of RFI interference. To ensure the engine operates at its highest rotational speed, it is advisable to use lower voltages.
- Voltage regulator – ESSENTIAL
WARNING: DO NOT use old battery packs. Only USE NEW ones.
3. Installation
Spiral Wrapping
- Use the provided Spiral Wrapping included with your Ignition to prevent wires from heat and chafing.
- Wrap the braided Spark Plug Lead, Hall Sensor Harnesses, and Battery Harnesses.
Mounting
- If possible, mount your Ignition on the engine box (this is the most ideal location).
- Use foam to minimize the impact of engine vibrations on the circuitry, similar to how you secure your receiver.
- While you can use the mounting tabs provided with the ignition, it is advisable to use zip ties or velcro ties for a secure installation.
WARNING: Avoid installing the ignition in the fuselage. Keep the ignition as far away from your receiver as possible, and never share the same power source for both your ignition and receiver.
Connecting the Battery
- The Rcexl ignition utilizes Futaba-style plug ends and includes an additional pigtail for connecting to your ignition switch if needed.
- Make sure to follow the color coding (Red +, Black -) when attaching your power source and on/off switch to your ignition power leads.
Hall Effects Sensor
- Select the sensor housing that best fits your engine and determine the orientation of your magnet (if it’s not known). Most sensors typically have a south orientation.
- To determine the orientation, connect the hall sensor to the ignition, insert the plug, and connect your power source.
- Carefully and gently pass the sensor over the magnet without stopping, as stopping may damage the sensor.
- If the plug doesn’t fire, flip the sensor over and repeat the process.
- Once the orientation is confirmed, insert the sensor fully into its housing and use the supplied wedge to secure it.
CAUTION: The wedge provides a one-way fit. This can make it challenging to remove if improperly inserted. If you plan to use your existing hall sensor, consult the manual for wire orientation (Red +, Black -, White signal).
Timing
Timing requirements may vary by manufacturer, but typically, 28°-30° Top Dead Center (TDC) is recommended.
Attach the Degree Wheel to the Crankshaft. Rotate the engine crankshaft until the piston reaches TDC, which can be determined by using a small wooden dowel to make contact with the piston top through the spark plug hole.
For precise timing, a dial indicator can be used. Without moving the crankshaft, adjust the Degree Wheel to read 0 degrees TDC and secure it in place. Rotate the crankshaft clockwise (opposite to the engine’s rotation) until the wheel indicates 28 degrees.
Connect the battery to the ignition, ensuring that the spark plug is not in the cylinder to prevent accidental ignition.
Adjustable Magnet Rings
For engines with adjustable magnet rings, turn the magnet fixed ring counterclockwise until you see the plug firing, then lock it in place to set the correct ignition timing (28°-30°). The plug will fire as the magnet passes slightly past the hall sensor, which is normal.
Fixed Hall Sensors
For engines with fixed hall sensors either attempt to use existing mounting holes or estimate the hall sensor’s position and drill and tap new holes as needed. Take into consideration the ovular holes on the hall sensor housing for allowance for new holes.
Degree Wheel – Top Dead Center
4. Trouble Shooting your Ignition
Battery
- Check the voltage on your battery and make sure it’s healthy and fully charged.
- Ensure that the voltage is 6v or less to the ignition.
Connections
- Verify that all connections, from the battery to the switch to the ignition, are correct.
- Use a voltmeter on the switch to confirm that the ignition is receiving power with the correct polarity.
Hall Effects Sensor
- Ensure that the orientation of the hall sensor aligns with the orientation of your hub magnet.
- If you are using an existing hall sensor, confirm that the wire orientation is correct.
5. Safety Precautions
- Never power the ignition with the spark plug installed in the engine head while working on your engine, as it could accidentally ignite.
- Always wear gloves when starting your engine.
- After turning off your ignition, be aware that it may still carry a charge and could activate the motor.
- Always perform a range check on your model before operation.