What is the spark plug gap on a BA Falcon?
For a typical Ford BA Falcon with the Barra inline-six, the spark plug gap is about 0.040–0.045 inches (1.0–1.15 mm). The exact gap depends on the plug type and whether you’re using copper-core, platinum, or iridium plugs. Always verify with the spark plug packaging or the vehicle’s service manual to be sure the gap matches your specific plug model.
Typical gap ranges for the Barra inline-six
To cover common plug types used in the BA Falcon, the following gaps are typical:
- Copper-core standard plugs: 0.040 inches (1.00 mm)
- Platinum or iridium replacement plugs: 0.043–0.044 inches (1.09–1.12 mm)
- OEM factory-plug sets (often pre-gapped): around 0.043–0.045 inches (1.09–1.15 mm)
Practically, many technicians target roughly 0.040–0.044 inches, adjusting only if the selected plug type specifies a different gap. Always double-check the exact recommendation for your plug model.
How to check and set the gap on a BA Falcon
Before you adjust gaps, gather the right tools and follow a careful procedure. The steps below assume you’re working on the engine with accessible spark plugs:
- Park the car on a flat surface and disconnect the battery to prevent any shorts.
- Remove the spark plug wire/coil pack to access the plug.
- Inspect the plug for wear or damage; if in doubt, replace with a new plug of the correct type.
- Check the gap with a calibrated feeler gauge set to the target value (around 0.040–0.044 inches, depending on your plug type).
- If the gap is too wide, gently bend the ground electrode inward with pliers; if too narrow, widen it carefully. Do not force the gap beyond what the plug allows.
- Reinstall the plug with light anti-seize compound on the threads (if recommended) and tighten to the manufacturer’s torque specification, then reattach the ignition coil or wire.
- Start the engine and listen for smooth idle; if misfires or rough idle occur, re-check the gap and connections.
Setting the gap correctly helps ensure efficient ignition, optimal fuel economy, and reduces the risk of misfires across the engine’s operating range.
Why the spark plug gap matters
The gap determines the electrical field required to ionize the air-fuel mixture and ignite it. A gap that’s too small makes a weaker spark, which can cause misfires and poor acceleration. A gap that’s too large can cause a delayed or interrupted spark, leading to rough idle and higher misfire risk, especially under load. For the BA Falcon’s Barra engine, using the correct gap helps preserve performance and fuel economy across its 4.0-liter range.
Summary: For most BA Falcons with the Barra 4.0L inline-six, aim for a spark plug gap around 0.040–0.045 inches (1.0–1.15 mm). The exact gap depends on plug type; copper-core plugs usually use about 0.040 in, while platinum/iridium plugs are often set to about 0.043–0.044 in. Always verify the specific plug’s packaging or the vehicle’s service manual, and adjust only within the recommended range.
What spark plug for barra?
Denso Iridium IK27 Spark Plug suits Ford Falcon Barra Turbo 4L. Denso Spark Plugs are trusted OEM parts for leading vehicle brands such as Toyota, Honda, Subaru, and Mitsubishi.
What is the spark plug gap on a Ford BA?
Spark Plug Set - 1.3MM Gap For Ford Falcon AU BA BF & BF2 Parts AGSP22Z13 6PCS.
What is the correct spark plug gap for?
The gap setting is different for each vehicle but most are somewhere between 0.028" and . 060". Consult the owner's manual or Champion ® catalog to find the recommended setting for the vehicle you're working on.
Is a 7 or 8 spark plug hotter?
A spark plug with a heat range 7 is hotter than a heat range 8 plug, meaning it retains heat longer and dissipates it more slowly. An #8 plug is "colder" and transfers heat to the cylinder head more quickly. The best choice depends on the engine's application, with hotter plugs (like a #7) suitable for daily driving and colder plugs (like an #8) ideal for high-performance engines, forced induction, or high-RPM use to prevent detonation.
This video explains the difference between hot and cold spark plugs: 50sHigh PSI tvYouTube · May 3, 2019
Spark plug heat range 7 vs. 8
| Feature | Heat Range 7 | Heat Range 8 |
|---|---|---|
| Heat | Hotter | Colder |
| Heat Transfer | Slower heat transfer to the cylinder head | Faster heat transfer to the cylinder head |
| Insulator Nose | Longer insulator nose | Shorter insulator nose |
| Best For | Stock, daily-driven, or less aggressive engines that run at lower RPMs | High-performance, high-compression, or forced-induction engines (like turbocharged or supercharged) |
| Risk | Can cause engine knocking or detonation if the engine runs too hot for the plug | Can cause carbon fouling if the engine doesn't get hot enough for the plug to "self-clean" |
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