Hot-Spark Performance Products - Electronic Ignition Conversion Kits for Ford, Delco, Prestolite, Autolite, Bosch, Automotive, Agricultural, Industrial, Marine Distributors

Compatible Coils for Use with Hot Spark® Ignition

Applies to Hot Spark 3-Series (red) ignition kits

Coil Warning: DO NOT use a low-resistance or an HEI-style coil. (4- and 6-cylinder) engines: Use a coil that has resistance, measured between the + and - terminals of the coil, of at least 3.0 Ohms (Ω). 8-cylinder ignition systems must be used with a coil that has between 1.5 and 2.0 Ω primary resistance.

Using a coil with insufficient primary resistance can cause the ignition module to overheat and misfire until it cools down again, or fail prematurely, which will void the Hot-Spark ignition warranty.

Check the voltage reading at the coil's + terminal, engine running, at maximum RPM at the coil's positive terminal. If the voltage reading is more than 13.9 volts at any RPM level, the voltage regulator likely needs replacing and/or a 1.4 to 1.7 Ohm ballast resistor should be wired between the coil's + terminal and the red HotSpark ignition wire. Too much voltage can damage the ignition module and other electronic components. The ballast resistor is usually mounted on the firewall or directly on the coil. Charging system voltage of 13.7 volts or so is plenty.

DO NOT reverse the polarity of the RED and BLACK wires - it will destroy the ignition module (and void its warranty)! The Hot-Spark module’s red wire connects to positive ( + or 15 on Bosch coil). The black wire connects to negative ( - or 1 on Bosch coil). Remove the condenser and its wire from vehicle.  All other wires are connected to the coil in their original places. This module is designed for 12V negative ground applications only.

Make sure that the ignition wires have plenty of slack inside the distributor and are not rubbing on any moving parts. If you need to extend the length of the ignition wires, use 18- or 20-gauge (AWG) wire. Crimp tightly or solder (best) and insulate all connections.

Hot-Spark Electronic Ignition Wiring Diagram

Compatible Coils

 

The Bosch Black Coil (made in North America) has 3.4 Ω primary resistance. Ideal for use with 4- and 6-cylinder Hot Spark ignition kits.

 

The Beru Blue Coil (made in North America) has 3.3 Ω primary resistance. Ideal for use with 4- and 6-cylinder Hot Spark ignition kits.



The following 12-volt Bosch® coils should be compatible with the Hot-Spark electronic ignition module (4-and 6-cylinder):

00 015 (Bosch)
0 221 119 021 (Bosch Black coil)
0 221 119 020 (Bosch Black coil) (VW 022 905 115C)
0 221 119 027 (Bosch Blue coil) (VW 043 905 115C)
9 220 081 039 (Bosch, Brazil)
9 220 081 054 (Bosch, Brazil)
9 220 081 083 (00 012) (Bosch Blue coil)
9 224 771 008 (Bosch Black coil)
0 439 051 15C (00012) (Bosch Silver Coil)

 

Beru Blue Coil (ZS-172) - Ideal for 4- and 6-cyl Hot Spark ignition kits

Bosch Black coil 9 224 771 008 - Ideal for 4- and 6-cyl Hot Spark ignition kits

The Bosch coils above should have a primary winding with 3.0 to 3.3 Ω resistance. Bosch coils are made in a number of countries, with varying amounts of primary and secondary resistance. It's best to check the coil's primary resistance with an Ohmmeter (a digital multi meter in the 200 Ω mode). Install a 1.4 Ω or so external ballast resistor (HS14BR) between the coil's + terminal and the red HotSpark ignition module's red wire, if the coil's primary resistance is questionable or borderline.

 

Bosch 0 221 119 030 (Bosch Red Coil, Brazil) 1.6 Ω to 1.8 Ω primary resistance (OK for 8-cylinder ignition kits, not enough primary resistance for 4- and 6-cylinder ignition kits).

 

Lucas® Coil Primary Resistance:
DLB102 1.5 Ω (oil-filled) - (8-cyl-only)
DLB110 1.5 Ω (oil-filled) - (8-cyl-only)
DLB105 3.0 Ω (oil-filled) - (4- and 6-cyl)
DLB101 3.0 Ω (oil-filled) - (4- and 6-cyl)

Flame-Thrower® (made in China) Coil Primary Resistance:
40001 1.5 Ω (oil-filled) - (8-cyl-only)
40011 1.5 Ω (oil-filled) - (8-cyl-only)
40111 1.5 Ω (epoxy-filled) - (8-cyl-only)
40501 3.0 Ω (oil-filled) - (4- and 6-cyl)
40511 3.0 Ω (oil-filled) - (4- and 6-cyl)
40611 3.0 Ω (epoxy-filled) - (4- and 6-cyl)
Do not use any other Flame-Thrower® coil, as it won't have enough primary resistance, allowing too much amperage to flow to the ignition module, destroying the module or shortening its life.

Commonly-Available Coils:
Duralast® (Autozone) LU800 3.3 Ω primary resistance, 8.3K Ω secondary resistance (oil-filled) - (4- and 6-cyl)
Wells® LU800 3.3 Ω primary resistance, 8.3K Ω secondary resistance (oil-filled) - (4- and 6-cyl)
Import Direct 23-0254 3.2 Ω primary resistance, secondary resistance: 7.8K Ω - (4- and 6-cyl)

NGK Ignition U1163 Coil 3.0+ primary resistance, 7K+ secondary resistance, oil-filled (4- and 6-cyl)


Duralast (Autozone) C838 1.5 Ω primary resistance, secondary resistance: 8K Ω - (8-cyl-only)
Duralast (Autozone) C819 1.5 Ω primary resistance, secondary resistance: 9.95K Ω - (8-cyl-only)
Borg-Warner E70 1.5 Ω primary resistance, secondary resistance: 9.35K Ω - (8-cyl-only)
Wells C819 1.5 Ω primary resistance, secondary resistance: 9.95K Ω - (8-cyl-only)
Masterpro 2-5195 1.5 Ω primary resistance, secondary resistance: 11.37K Ω - (8-cyl-only)

 

Measuring Coil Primary Resistance: 4-Cylinder: Coil must have a minimum of 3 Ohms primary resistance. 8-Cylinder: Coil must have between 1.5 Ohms and 2.0 Ohms primary resistance. To measure primary resistance: Label and remove all wires to coil ( + or - ). Using a common digital multimeter in the 200 Ω mode, cross the red and black leads of the Ohmmeter. Allow a few seconds for the reading to settle and write down the reading.

Still in the 200 Ohm mode, measure between coil’s + and - terminals. Allow a few seconds for the reading to settle, until it stabilizes. Subtract the previous reading, taken with the leads crossed, to compensate for multimeter’s inherent resistance. Do not use a low-resistance coil, such as the MSD or Accel coil; they don’t have enough primary resistance for this application. Using a coil with too little primary resistance can cause the ignition module to overheat and misfire until it cools down again or fails, voiding the warranty.

Ohmmeter Calibration: When the Ohmmeter’s red and black leads are connected to each other, the reading should be 0.00 or very close to zero. If, though, for example, with both Ohmmeter leads shorted together, the reading is 0.5 Ω, you’ll need to subtract 0.5 Ω from the reading you get when measuring the coil’s primary resistance. For example, if the coil’s primary resistance reading is 3.5 Ω, but when the Ohmmeter leads are shorted together the reading is 0.5 Ω, then the coil’s primary resistance is 3.0 Ω: 3.5 Ω - 0.5 Ω = 3.0 Ω. This calibration procedure applies only to resistance measurements made in the 200 Ω mode of a digital Ohmmeter.

The inherent resistance of the leads is negligible in higher Ω modes of the Ohmmeter. If you’re using an analog Ohmmeter, touch the leads together while setting the needle on zero before measuring resistance.

Measuring Coil Secondary Resistance: For best performance, coil should have 7K Ohms or more secondary resistance. To measure secondary resistance: Label and remove all wires to coil ( + or - ). Using a common digital multimeter in the 20K Ω mode, place one Ohmmeter lead on the coil's + or - terminal and the other Ohmmeter lead in the coil's center high-tension wire socket, the socket that holds the lead from the center of the coil to the center of distributor cap.

Check the voltage reading at the coil's + terminal, engine running, at maximum RPM at the coil's positive terminal. If the voltage reading is more than 13.9 volts at any RPM level, the voltage regulator likely needs replacing and/or a 1.4 Ohm ballast resistor should be wired between the coil's + terminal and the red Hot Spark ignition wire. Too much voltage can damage the ignition module and other electronic components. The ballast resistor is usually mounted on the firewall or directly on the coil. Charging system voltage of 13.4 volts or so is plenty.

Ohmmeter Calibration: When the Ohmmeter’s red and black leads are connected to each other, the reading should be 0.00 or very close to zero. If, though, for example, with both Ohmmeter leads shorted together, the reading is 0.5 Ω, you’ll need to subtract 0.5 Ω from the reading you get when measuring the coil’s primary resistance. For example, if the coil’s primary resistance reading is 3.5 Ω, but when the Ohmmeter leads are shorted together the reading is 0.5 Ω, then the coil’s primary resistance is 3.0 Ω: 3.5 Ω - 0.5 Ω = 3.0 Ω. This calibration procedure applies only to resistance measurements made in the 200 Ω mode of a digital Ohmmeter.

The inherent resistance of the leads is negligible in higher Ω modes of the Ohmmeter. If you’re using an analog Ohmmeter, touch the leads together while setting the needle on zero before measuring resistance.

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Hot-Spark Performance Products - Electronic Ignition Conversion Kits for Ford, Delco, Prestolite, Autolite, Bosch, Automotive, Agricultural, Industrial, Marine Distributors

 

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