Lena Savoie
Spark plugs are a critical component of an engine's operation. The gap in a spark plug, or the distance between the two electrodes, is essential for the spark plug to function properly. The size of the gap affects the spark plug's firing temperature and the combustion of fuel and air in the engine. While spark plugs often come pre-gapped, the gap may need to be adjusted to fit the specific engine and vehicle. This is especially important for modified engines, engines with higher power, and race engines, as the gap size has a direct effect on the voltage required to ignite the air-fuel mixture. Adjusting the gap can also help maximize burn efficiency and engine performance. Therefore, it is crucial to learn the correct way to check, set, and adjust the spark plug gap to ensure the engine runs smoothly and efficiently.
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What You'll Learn
Spark plug gaps and engine performance
The gap in a spark plug is the space between the two electrodes on the spark plug tip. A properly gapped spark plug is critical to engine performance. The gap size has a direct effect on the spark plug's firing temperature, which affects the combustion of fuel and air in the engine. If the gap is too large, the ignition system has to work harder to ignite the air-fuel mixture, leading to premature wear and possible failures. A gap that is too small will not fully ignite the air-fuel mixture, leading to low power and higher tailpipe emissions.
The correct spark plug gap depends on the voltage and amperage of the ignition system, cylinder pressure, and air/fuel mixture density. The rule of thumb is that as the engine power increases, the spark plug gap should decrease. This is because a small, intense spark is better for lighting a dense, wet fuel mixture, which is common in high-performance engines. A smaller gap will also make the engine more responsive.
When replacing spark plugs, it is important to ensure that the gap is set correctly for the specific engine. While spark plugs often come pre-gapped, the gap may need to be adjusted to match the vehicle manufacturer's specifications. The gap setting can usually be found in the owner's manual or the emission sticker under the hood. It is also important to use the proper spark plug gapping tool and to be careful when making adjustments, as the electrodes can be delicate and prone to damage.
Additionally, modifications to the engine, such as increasing compression or adding forced induction, may require a smaller gap setting. For example, for every 50 hp added, the gap should be reduced by about 0.004". On the other hand, adding a high-power ignition system may allow for a slightly larger gap.
In conclusion, spark plug gaps play a critical role in engine performance. By ensuring that the spark plugs have the correct gap and making adjustments as needed, optimal engine performance, efficiency, and longevity can be achieved.
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How to measure a spark plug gap
A properly gapped spark plug is crucial for a well-functioning engine. The gap size affects the spark plug's firing temperature, which is directly related to the combustion of fuel and air in the engine. The gap size must be wide enough to create a spark with sufficient energy to ignite the air-fuel mixture.
To measure a spark plug gap, you will need a spark plug gap measuring tool. There are several varieties of tools, including a coin-style gap measure, which is the cheapest option, and a wire coin gap, which is similar but features different wire measures of varying lengths. The coin is run through the gap, and the point where it stops determines the thickness of the gap. It is important to note that this method may inadvertently widen the gap.
First, you must ensure that the spark plug is clean. If it has been used, it may have built up some whitish soot on the contact points, which can be cleaned with a clean cloth and a small amount of quick-drying alcohol.
Once the spark plug is clean, you can measure the gap by passing the tool through the electrodes. If the tool passes through without touching the electrodes, the gap is too wide and needs to be narrowed. If the tool does not fit between the electrodes, the gap is too small and needs to be widened. If the tool fits closely to the specified measurement, the spark plug is ready to be installed.
It is important to consult the manufacturer's specifications to determine the correct gap size for your vehicle. The gap size may need to be adjusted based on any modifications made to the engine, such as increasing compression or adding forced induction. For example, when adding a high-power ignition system, the gap can be opened by 0.002"-0.005".
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Adjusting spark plug gaps
A properly gapped spark plug is necessary for a properly functioning engine. The gap size affects the spark plug's firing temperature, which has a direct relationship to the combustion of fuel and air in the engine.
Selecting a Gap Tool
There are several varieties of tools used to measure the gaps of spark plugs, some of which are more appropriate for modern plugs, which sometimes feature delicate precious metals. Most measuring tools will also feature a flat edge typically used for bending the bottom electrode on the spark plug to adjust the gap slightly. A coin-style gap measure is usually the cheapest option, and works by running the edge of the "coin" through the gap until you reach a point where it stops. The edge is marked like a ruler, designating the thickness of the edge at that point. This is a good tool for older plugs you want to check the efficacy of, but can also inadvertently widen the gaps as you use it. A wire coin gap works essentially the same way as the regular coin-style gap, but features different wire measures of varying lengths on the edge. A blade-style feeler gauge is an effective and versatile tool, featuring different blades of varying widths, some with wire on the end and some without.
Cleaning the Spark Plug
If you've just pulled it out of the box, it should be in pretty good shape, but if you're checking a plug that you've been using in your car it's a good idea to clean it off a little with a clean cloth. Spark plugs can build up some whitish soot on the contact points, so you'll want to make sure they're somewhat clean to get the most accurate reading. You can use a little bit of quick-drying (90%) alcohol on the contact points to clean them off if they're especially dirty. Lots of build-up or any blackening on the contact points might be a sign of a plug that's outlasted its prime. There's also a special tool designed for cleaning spark plugs—a sand-filled pouch that's attached to an air compressor. It cleans the electrode of the spark plug by sandblasting it.
Measuring the Gap
Place the appropriate blade or wire on your gap tool between the electrode tips of the plug, or pass the coin through the electrodes to determine the measurement. 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.
Adjusting the Gap
If the tool passes through the gap without touching the electrodes at the appropriate measure, your gap is too wide. If you can't fit it between the electrodes, the gap is too small and needs to be widened. If it fits closely to the specified measurement, you're safe to install the spark plug. When adjusting the gap, be careful not to apply any pressure or prying force to the fine wire center electrode or insulator as they can be damaged. The gap should be adjusted by only moving the ground electrode.
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Tools for measuring spark plug gaps
Gapping spark plugs is necessary for a properly functioning engine. The gap size affects the spark plug's firing temperature, which impacts the combustion of fuel and air in the engine. The rule of thumb is that the more power an engine makes, the smaller the gap needs to be.
There are several tools available to measure spark plug gaps. Here are some of the most common ones:
- Coin-style gap measure: Shaped like a coin, this tool has measurements marked around its edge, with the outer edge being thin and gradually getting thicker. It is the cheapest option and works by running the edge of the coin through the gap. While it is a good tool for older plugs, it may inadvertently widen the gaps as you use it.
- Wire coin gap: This tool works similarly to the coin-style gap but features different wire measures of varying lengths on the edge.
- Feeler gauges: These gauges are ideal for use with iridium spark plugs and other plugs containing precious metals. They provide more accurate measurements than other types of tools. However, you will need a pair of pliers to bend the spark plug electrode, as the blades can become deformed if used for adjustment.
- Digital calipers: These tools can be used for any "precise" measurement, including spark plug gaps, and are available at a relatively low cost.
- Spark plug gap tool: While specific details on this tool are scarce, it is designed to help achieve the exact measurement recommended by the manufacturer, boosting the efficiency of the spark plug.
It is important to consult your owner's manual for the right gap measurement and ensure that the spark plug gap is correctly set to the vehicle's recommended setting.
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The impact of spark plug gaps on ignition
The spark plug gap is the distance between the electrodes of the spark plug. The size of the gap affects the spark plug's firing temperature, which has a direct impact on the combustion of fuel and air in the engine. A properly gapped spark plug is necessary for a properly functioning engine.
The amount of voltage and amperage in the ignition system, cylinder pressure, and air/fuel mixture density all influence the width of the spark plug gap. The rule of thumb is that more powerful engines require a smaller gap. Race engines, for example, typically use smaller gaps than stock engines due to higher cylinder pressures and denser air/fuel mixtures. A small, intense spark is better suited for lighting a highly dense and wet fuel mixture, similar to the flame produced by modern lighters.
Additionally, the spark plug gap can impact engine performance and emissions. Experimental tests have shown that the gap affects flame kernel development, engine performance, and emissions levels. Properly gapping the spark plugs can improve engine efficiency, extend the lean limit of combustion, and positively impact carbon monoxide and unburned hydrocarbon emissions.
It is important to consult the manufacturer's specifications when setting the spark plug gap. The gap may need to be adjusted based on engine modifications, such as increased compression or the addition of forced induction, to ensure optimal performance and avoid misfires.
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Frequently asked questions
Spark plugs are critical to engine performance. The gap between the centre and side electrodes is set so that arcing occurs at the proper voltage to ignite the fuel and generate combustion.
The ideal gap depends on the voltage and amperage of the ignition system, cylinder pressure, and air/fuel mixture density. The rule of thumb is that the more power an engine makes, the smaller the gap needs to be.
You can use a gap tool, such as a coin-style gap measure, to measure the distance between the electrodes of the spark plug.
You can use a spark plug gap tool to gently bend the ground electrode in or out to adjust the gap. Be careful not to apply too much pressure, as the electrode is fragile.
An incorrect gap can lead to engine issues such as loss of power, misfires, plug fouling, poor fuel economy, and accelerated plug wear.
