Upgrading your vehicle’s ignition system is one of the most cost‑effective ways to unlock hidden horsepower and improve throttle response. The Crane Ignition System delivers a genuine gain of up to 20 horsepower at the wheels for less than $350 — a price point that beats many bolt‑on mods. This expanded guide walks you through every step of the installation, explains the technology behind the power increase, and offers pro‑tips to get the most out of your new system. Whether you’re a seasoned DIYer or a first‑time installer, you’ll find all the information you need to complete the job safely and correctly.

Understanding the Crane Ignition System

The Crane ignition system replaces your vehicle’s stock components — coil, distributor cap, rotor, and often the wiring — with a high‑energy design that delivers a hotter, longer‑lasting spark. A stronger spark allows the air‑fuel mixture to burn more completely, increasing cylinder pressure and producing more torque and horsepower. The system also provides more precise spark timing, reducing knock and allowing you to run more aggressive timing if your engine can handle it.

Key features of a typical Crane kit include:

  • High‑output ignition coil — Delivers up to 50,000 volts compared to a typical stock coil’s 30‑40 kV.
  • Performance distributor cap and rotor — Brass or aluminum terminals reduce resistance and prevent misfires at high RPM.
  • Suppression spark plug wires — Low‑resistance, RFI‑shielding wires ensure maximum energy reaches the plugs.
  • Wiring harness and instructions — Plug‑and‑play connectors simplify installation for most common vehicle makes and models.

For more background on how ignition energy affects combustion, read this excellent article on Crane Cams’ ignition primer.

Tools and Materials Needed

Before you begin, gather all the tools and supplies listed below. Having everything within reach prevents frustrating mid‑project trips to the hardware store.

  • Crane Ignition System Kit (verify correct part number for your engine make and year)
  • Basic hand tools: socket and ratchet set, screwdrivers (flathead and Phillips), combination wrenches
  • Wire cutters / wire strippers
  • Multimeter (for voltage and continuity checks)
  • Heat shrink tubing (assorted sizes) and a heat gun or lighter
  • Electrical tape (high‑temperature rated)
  • Dielectric grease (for spark plug and distributor connections)
  • Safety goggles and work gloves
  • Feeler gauge (to set spark plug gaps if needed)
  • Shop rags or paper towels

Optional but recommended: a timing light and a dwell meter if you plan to fine‑tune ignition timing after installation.

Safety Precautions

Working on an ignition system involves high voltage and moving engine parts. Follow these safety rules:

  • Always disconnect the negative battery cable before touching any ignition components. This prevents accidental shorts and protects the ECU on modern vehicles.
  • Never smoke or allow open flames near the battery or fuel system.
  • Wear safety goggles to shield your eyes from debris and acid.
  • Ensure the engine is cool before removing spark plugs or distributor caps to avoid burns.
  • If your vehicle has a capacitive discharge (CD) or multi‑strike ignition, allow the system to discharge fully before handling components.

Proper preparation and caution will keep you safe and ensure the installation goes smoothly.

Step‑by‑Step Installation Guide

These instructions assume you are installing a complete Crane ignition system that includes a coil, distributor cap, rotor, and wiring. If your kit includes only a coil or other parts, adapt the steps accordingly — always follow the manufacturer’s specific instructions included with your kit.

1. Disconnect the Battery

Use a socket or wrench to loosen the nut on the negative battery terminal. Remove the cable and tuck it away from the battery so it cannot accidentally contact the terminal. On many modern vehicles, you may also need to disconnect the positive side if you are working near the power distribution box. Wait at least 10 minutes for any residual voltage in the ECU to dissipate.

2. Remove the Old Ignition Components

Start by removing the distributor cap. Label each spark plug wire with masking tape if you plan to reuse them — although the Crane kit usually includes new wires. Unscrew the rotor from the distributor shaft. Next, locate the ignition coil. It may be mounted on the engine block, firewall, or inside the distributor cap on older models. Disconnect the wires (note their positions) and unbolt the coil. Remove any old wiring harness brackets that might interfere with the new components.

Tip: Take photos before disassembly — they are invaluable when reinstalling parts.

3. Install the Crane High‑Output Coil

Mount the new coil in the same location as the old one, using the supplied brackets if necessary. If the new coil is physically larger, you may need to fabricate a simple bracket or use a universal mount. Connect the positive and negative terminals according to the wiring diagram in the Crane instructions. Typically, the positive terminal receives 12V from the ignition switch, and the negative terminal connects to the distributor’s points or electronic module. Use heat shrink tubing on each crimped connection to prevent moisture and vibration from causing failure.

If your vehicle uses a ballast resistor (common on older points‑style systems), the Crane instructions will tell you whether to bypass it. Most high‑energy coils require full battery voltage, so you will remove or jumper the resistor. Check the voltage at the coil positive terminal with a multimeter before starting the engine — you should read 12‑14V with the key on.

4. Install the New Distributor Cap and Rotor

Clean the inside of the distributor housing with a rag. Remove any old grease or carbon tracking. Insert the new rotor onto the distributor shaft — it should press on firmly and rotate freely. Place the new cap over the distributor, aligning the notch or tab. Tighten the retaining screws or clips. Reattach the spark plug wires to the cap in the correct firing order. Use dielectric grease inside each wire boot to prevent corrosion and make removal easier in the future.

Important: If your kit includes new spark plug wires, replace them one at a time to avoid crossing the firing order. Route the wires away from exhaust manifolds and sharp edges. Use wire separators if available.

5. Modify or Install the Wiring Harness

The Crane kit typically includes a custom wiring harness that simplifies connections. Lay the harness along the existing wire paths, securing it with zip ties. Connect the harness to the coil terminals, distributor module (if external), and power source. Some kits require you to splice into the tachometer output or the crankshaft position sensor — consult the instructions carefully. Use a multimeter to verify continuity for each circuit before finalizing connections.

For a cleaner installation, consider installing a relay to supply direct battery power to the ignition system, triggered by the ignition switch. This reduces voltage drop and ensures consistent spark energy at high RPM. Crane provides a relay wiring diagram in many of their kits.

6. Adjust Spark Plug Gaps (if needed)

With a hotter ignition, you can often open the spark plug gap slightly — many Crane kits recommend a gap of 0.045–0.055 inch instead of the stock 0.035–0.040 inch. Use a feeler gauge and gap tool to set each plug. Do not exceed the maximum gap specified for your engine; a gap that is too wide may cause misfire. Install spark plugs if you are replacing them (recommended) and torque to spec.

If you are using the same plugs, clean and regap them after 30,000 miles for best results.

7. Reconnect the Battery and Test

Reattach the negative battery cable and tighten securely. Turn the ignition key to the “ON” position (do not start) — verify that the dashboard lights illuminate and that you hear a faint hum from the fuel pump (if fuel‑injected). Check for any spark‑related signals: a bad connection may cause the engine to crank but not fire.

Start the engine and listen for smooth idling. Rev the engine to 3,000 RPM and hold for a few seconds — the engine should rev cleanly without hesitation. Use a timing light to verify that base timing matches the manufacturer’s specification. If your kit includes an adjustable timing control (like the Crane Hi‑6), set initial timing per your engine’s requirements. A typical performance engine may want 10–14 degrees of initial advance.

Finally, take a test drive. Pay attention to throttle response, especially under load. If you feel any pinging, retard the timing slightly. If the engine feels sluggish, you may benefit from advancing timing a degree or two.

Tuning for Maximum Performance

To fully realize the 20‑horsepower potential of your Crane ignition system, consider these additional adjustments:

  • Spark plug selection: Upgrade to a plug that suits a high‑energy ignition, such as a fine‑wire iridium or platinum plug. These handle the increased voltage better and last longer.
  • Fuel mixture optimization: A hotter spark can burn a leaner mixture. Recheck your air‑fuel ratio using an oxygen sensor or wideband gauge. You may be able to lean the mixture slightly for more efficiency without sacrificing power.
  • Ignition timing advance: With better combustion stability, you can often add 2–4 degrees of total advance. Use a timing curve that maximizes torque without causing detonation. A programmable ignition module (Crane’s TR‑700) allows mapping timing vs. RPM.
  • Upgraded spark plug wires: If your kit did not include wires, replace old carbon‑core wires with spiral‑core or solid‑core wires that match the higher energy of the new coil.

For more in‑depth tuning tips, read this Hot Rod article on ignition tuning.

Common Issues and Troubleshooting

Even a straightforward installation can encounter minor problems. Here are the most frequent issues and their solutions:

  • Engine cranks but does not start: Check for spark at the plug wire. If no spark, verify power at the coil positive terminal (12V with key on). Check that the distributor’s pickup coil or points are properly gapped and connected. Ensure the roll pin on the rotor is intact.
  • Rough idle or misfire: This often points to incorrect plug gap, cross‑firing wires, or a vacuum leak. Double‑check the firing order and plug wire resistance with an ohmmeter.
  • Backfiring through the intake: Usually indicates a lean mixture or an incorrect timing advance. Retard the base timing and check for vacuum leaks. Also verify that the distributor is not 180° out of phase.
  • Engine runs hot or knocks: Excessively advanced timing or too‑hot spark plugs cause detonation. Retard timing, use a colder plug, or increase the octane rating of your fuel.
  • No power above 4,000 RPM: The coil may be mounted too close to the engine block, causing heat soak. Relocate or shield the coil. Also check that the spark plug wires have sufficient insulation for the higher voltage.

If you still encounter problems, consult the Crane Cams FAQ page or visit a dedicated automotive performance forum like TurboFord.org for model‑specific advice.

Conclusion

Installing a Crane Ignition System is one of the most straightforward and satisfying upgrades you can make to a gasoline‑powered vehicle. For under $350, you gain measurable horsepower, better fuel economy, and sharper throttle response — all while gaining familiarity with your engine’s ignition system. By following the step‑by‑step guide above, taking proper safety precautions, and tuning the system for your specific engine, you can achieve that 20‑horsepower gain reliably and with confidence.

Whether you drive a classic muscle car, a street truck, or a modern four‑cylinder, the principles remain the same. A hotter spark makes for a happier engine. So gather your tools, read the instructions that come with your kit, and enjoy the satisfaction of a DIY performance upgrade that truly works.

Don’t stop with the ignition — combine it with a cold‑air intake and a performance exhaust for a synergistic increase in power. But start here. Your engine will thank you.