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techtalk:evo:engctl01 [2020/03/29 20:32] ixl2relax [Manually Trigger Coils For Testing Spark] |
techtalk:evo:engctl01 [2020/05/29 21:44] ixl2relax [Electronic Ignition Systems] |
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| * Ignition timing is when the spark takes place - specifically as the piston is traveling UP on the COMPRESSION stroke (compressing the gasses so that you get the most out of the explosion/ignition). ((Moved On / My Own Choice http://xlforum.net/forums/showthread.php?t=278587&highlight=map+sensor&page=2)) | * Ignition timing is when the spark takes place - specifically as the piston is traveling UP on the COMPRESSION stroke (compressing the gasses so that you get the most out of the explosion/ignition). ((Moved On / My Own Choice http://xlforum.net/forums/showthread.php?t=278587&highlight=map+sensor&page=2)) | ||
| - | * Top Dead Center is when the piston is at the VERY top of its travel, in the center of it's dwell area, and is usually referenced to mean on TDC of the COMPRESSION stroke (with the valves closed and the mixture compressed), though the piston will also be at TDC on the Exhaust stroke when the flywheel turns one complete rotation in either direction from TDC of compression. ((Moved On / My Own Choice http://xlforum.net/forums/showthread.php?t=278587&highlight=map+sensor&page=2)) So, the piston will be at TDC twice per 1 full revolution of the cams. Timing is measured (and set) from TDC on the compression stroke. See more on [[techtalk:ref:svcproc22#reftroubleshooting_-_engine_-_05|Finding TDC on Compression Stroke]] in the Sportsterpedia. | + | * Top Dead Center is when the piston is at the VERY top of its travel, in the center of it's dwell area, and is usually referenced to mean on TDC of the COMPRESSION stroke (with the valves closed and the mixture compressed), though the piston will also be at TDC on the Exhaust stroke when the flywheel turns one complete rotation in either direction from TDC of compression. ((Moved On / My Own Choice http://xlforum.net/forums/showthread.php?t=278587&highlight=map+sensor&page=2)) So, the piston will be at TDC twice per 1 full revolution of the cams. Timing is measured (and set) from TDC on the compression stroke. Check below for the images of cam notch on timing rotor position relative to TDC Compression or see more on [[techtalk:ref:svcproc22#reftroubleshooting_-_engine_-_05|Finding TDC on Compression Stroke]] in the Sportsterpedia. |
| * Spark ADVANCE - is how soon, BEFORE the piston reaches top dead center (or how late - AFTER top dead center) that the spark plug fires to start burning the mixture. The faster the motor is turning, the sooner you need to start the ignition (more advanced it needs to be) so that power of the expanding gasses starts pushing on that piston as soon as it starts moving downward and pushes as long as will be beneficial. ((Moved On / My Own Choice http://xlforum.net/forums/showthread.php?t=278587&highlight=map+sensor&page=2)) | * Spark ADVANCE - is how soon, BEFORE the piston reaches top dead center (or how late - AFTER top dead center) that the spark plug fires to start burning the mixture. The faster the motor is turning, the sooner you need to start the ignition (more advanced it needs to be) so that power of the expanding gasses starts pushing on that piston as soon as it starts moving downward and pushes as long as will be beneficial. ((Moved On / My Own Choice http://xlforum.net/forums/showthread.php?t=278587&highlight=map+sensor&page=2)) | ||
| * Ignite it too soon, and the gasses start pushing down as the piston is still coming up (spark knock, pinging etc). ((Moved On / My Own Choice http://xlforum.net/forums/showthread.php?t=278587&highlight=map+sensor&page=2)) | * Ignite it too soon, and the gasses start pushing down as the piston is still coming up (spark knock, pinging etc). ((Moved On / My Own Choice http://xlforum.net/forums/showthread.php?t=278587&highlight=map+sensor&page=2)) | ||
| * Ignite it too late, and you loose a lot of the power of the gases, since the piston will reach bottom before the gasses finish expanding. ((Moved On / My Own Choice http://xlforum.net/forums/showthread.php?t=278587&highlight=map+sensor&page=2)) | * Ignite it too late, and you loose a lot of the power of the gases, since the piston will reach bottom before the gasses finish expanding. ((Moved On / My Own Choice http://xlforum.net/forums/showthread.php?t=278587&highlight=map+sensor&page=2)) | ||
| - | ^ ^ 0°=TDC ^ 20°BTDC Adv ^ 40°BTDC Adv ^ Timing Hole ^ | | + | ^ Yeark ^ 0°=TDC\\ Timing Mark ^ 20°BTDC Adv\\ Timing Mark ^ 40°BTDC Adv\\ Timing Mark ^ Timing Hole\\ on Engine ^ Notes | |
| - | ^ Year ^ Timing Mark ^ Timing Mark ^ Timing Mark ^ Lt/Rt ^ Notes | | + | |
| | 1986-90 | Vertical Line | Single Dot | None | Left Side | Approx. 1000rpm=20°Adv - Using Timing Light - Look for Single Dot - 4sp Trans| | | 1986-90 | Vertical Line | Single Dot | None | Left Side | Approx. 1000rpm=20°Adv - Using Timing Light - Look for Single Dot - 4sp Trans| | ||
| | 1991-95 | Vertical Line | Single Dot | None | Right Side | Approx. 1000rpm=20°Adv - Using Timing Light - Look for Single Dot - 5sp Trans| | | 1991-95 | Vertical Line | Single Dot | None | Right Side | Approx. 1000rpm=20°Adv - Using Timing Light - Look for Single Dot - 5sp Trans| | ||
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| | 2000-03 | Vertical Line | Double Dots | Some-SingleDot | Right Side | Approx. 1000rpm=20°Adv - Using Timing Light - Look for Double Dots - Press Fit Flywheel | | | 2000-03 | Vertical Line | Double Dots | Some-SingleDot | Right Side | Approx. 1000rpm=20°Adv - Using Timing Light - Look for Double Dots - Press Fit Flywheel | | ||
| | The Timing Hole Plug (HD P/N 720) can be removed with a 3/8" Allen Hex Key - It has 5/8-18 threads |||||| | | The Timing Hole Plug (HD P/N 720) can be removed with a 3/8" Allen Hex Key - It has 5/8-18 threads |||||| | ||
| + | | Some 1996-2003 flywheels have a Single Dot to indicate 40° BTDC when engine rpm is ~3500 rpms |||||| | ||
| | 2004-later | **No Timing Hole or Timing Marks on Flywheel** - Base Timing is set in programmable Engine Control Module using CKP Sensor at Flywheel Teeth ||||| | | 2004-later | **No Timing Hole or Timing Marks on Flywheel** - Base Timing is set in programmable Engine Control Module using CKP Sensor at Flywheel Teeth ||||| | ||
