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Spark Plug Gap
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[QUOTE="WoodsRider, post: 475741, member: 16545"] Working almost exclusively with diesel engines I've forgotten a lot of what I learned about electrical ignition systems. So from memory: The spark plug gap provides resistance in the ignition system. The coil needs to build up enough energy in order for electricity to jump this gap. The heat of this coil energy jumping the gap is what initiates the controlled burning of the air-fuel mixture inside the cylinder. So the spark plug gap is critical for timing and efficient burning of the air-fuel mixture. Too small of a gap will not allow enough coil energy to build up. The ignition point will be advanced in the cycle causing problems such as higher than normal brake mean effective pressure (BMEP) in the cylinder, higher than normal cylinder temperatures, higher idle speed and difficulty starting. Too large of a spark plug gap will cause too much coil energy to build up. The ignition point will be later in the cycle (retarded) causing problems such as misfiring, low BMEP, lower than normal operating temperatures, lower idle speed and incomplete combustion. This is only a stab in the dark since it's been almost 15 years since I've read anything on electrical ignition systems. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Spark Plug Gap
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