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Classic Goldwing Technical Forums
Lighting & Electrical
Single ignition thoughts, or lack of thought??
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<blockquote data-quote="C5Performance" data-source="post: 100791" data-attributes="member: 2938"><p><strong>Has anyone measured the exact variation in timing on a belt driven cam? </strong></p><p></p><p>Boxer engine owners seem to really focus on belt play as the cause of running issues. </p><p>When first getting into early Wings I never understood why it was such a big deal. When the engine is running the belt slack should be on the "back" side of the system, so timing will only be inaccurate at low idle, correct?</p><p> I'd guess at least half of motorcycles ever made had points located on the cam, even though most were chain driven. You can get chain slop just like belt slop, so why do Wing guys fret over it so much? Nobody on the Honda CB websites worry about chain slop, and every CB175 and CB350 made used a cam driven ignition.</p><p></p><p>My thinking is the actual variation in timing when the engine is under acceleration would be less than 1 degree. If that is true, are we chasing the wrong problem?</p><p>Points can be horribly inaccurate</p><p>Magnetic triggers are up to 7 degrees off at any rpm</p><p>Optic triggers are within 1-2 degrees depending on the quality of the trigger. </p><p></p><p>The goal of any ignition is to help the engine reach PCP (peak cylinder pressure) at 14-16 degrees ATDC. If you set timing to accomplish this, and it's accurate and repeatable (not randomly accurate) then every running issue after that is not related to ignition.</p><p></p><p>Again, i ask the question...what is the timing variation on belt driven engines? I dont' think I have ever read an actual number but it's critical to know before we can attempt to fix an issue related to belt deflection.</p></blockquote><p></p>
[QUOTE="C5Performance, post: 100791, member: 2938"] [b]Has anyone measured the exact variation in timing on a belt driven cam? [/b] Boxer engine owners seem to really focus on belt play as the cause of running issues. When first getting into early Wings I never understood why it was such a big deal. When the engine is running the belt slack should be on the "back" side of the system, so timing will only be inaccurate at low idle, correct? I'd guess at least half of motorcycles ever made had points located on the cam, even though most were chain driven. You can get chain slop just like belt slop, so why do Wing guys fret over it so much? Nobody on the Honda CB websites worry about chain slop, and every CB175 and CB350 made used a cam driven ignition. My thinking is the actual variation in timing when the engine is under acceleration would be less than 1 degree. If that is true, are we chasing the wrong problem? Points can be horribly inaccurate Magnetic triggers are up to 7 degrees off at any rpm Optic triggers are within 1-2 degrees depending on the quality of the trigger. The goal of any ignition is to help the engine reach PCP (peak cylinder pressure) at 14-16 degrees ATDC. If you set timing to accomplish this, and it's accurate and repeatable (not randomly accurate) then every running issue after that is not related to ignition. Again, i ask the question...what is the timing variation on belt driven engines? I dont' think I have ever read an actual number but it's critical to know before we can attempt to fix an issue related to belt deflection. [/QUOTE]
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Single ignition thoughts, or lack of thought??
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