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Classic Goldwing Technical Forums
Lighting & Electrical
C5, PowerArc, and the mystery of Timing
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<blockquote data-quote="C5Performance" data-source="post: 95710" data-attributes="member: 2938"><p>I would like to explain a few things about timing curves. There are things i will leave out, but for those new to ignitions and tuning, i want to keep it simple. </p><p></p><p>What is a timing curve?</p><p></p><p>When an piston is moving up the cylinder towards the highest point of its travel (TDC=Top Dead Center) the coil must be turned off so the spark plug ignites the fuel. We need to "time" the two events for proper fuel burn and maximum power (efficiency).</p><p></p><p>When a piston is moving slow, the amount of time needed for electricity to travel from the coil to sparkplug is much different than when the piston is moving fast.</p><p></p><p>NOTE***</p><p></p><p>When talking about the time it takes, we do not use TIME on a clock. Instead we use DEGREES of engine rotation before the piston reaches the top. Remember this point. Please let me know if you are confused. Everything I will be discussing is going to make more sense if you understand this statement. </p><p></p><p>So a timing curve is a method of showing the amount of timing advance versus the engine's rpm at that point. </p><p>Next I will discuss why most four stroke engines have the same curve.</p></blockquote><p></p>
[QUOTE="C5Performance, post: 95710, member: 2938"] I would like to explain a few things about timing curves. There are things i will leave out, but for those new to ignitions and tuning, i want to keep it simple. What is a timing curve? When an piston is moving up the cylinder towards the highest point of its travel (TDC=Top Dead Center) the coil must be turned off so the spark plug ignites the fuel. We need to "time" the two events for proper fuel burn and maximum power (efficiency). When a piston is moving slow, the amount of time needed for electricity to travel from the coil to sparkplug is much different than when the piston is moving fast. NOTE*** When talking about the time it takes, we do not use TIME on a clock. Instead we use DEGREES of engine rotation before the piston reaches the top. Remember this point. Please let me know if you are confused. Everything I will be discussing is going to make more sense if you understand this statement. So a timing curve is a method of showing the amount of timing advance versus the engine's rpm at that point. Next I will discuss why most four stroke engines have the same curve. [/QUOTE]
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Classic Goldwing Technical Forums
Lighting & Electrical
C5, PowerArc, and the mystery of Timing
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