Changes by last author:
Changed:
| * V8 with distributor ignition, simple trigger with 4 points on the crank damper. |
| * V8 with distributor ignition, simple trigger with HALL sensor, 4 points on the crank damper (evenly spaced 90 crankdeg) |
| Owner will try enabling delayed reenable and hall dirac filtering to see if it goes away. |
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Owner will try enabling delayed reenable and HALL dirac filtering to see if it goes away.
* If there are no double pulses in triggerlog (zoom in heavily), filtering changes will most likely not help. * Triggerlog 115200 (or even 19200) baud can transmit and capture all pulses upto redline RPM with this low toothcount trigger (only ~ 1300 bytes/sec or 600 pulses/sec at 9000 RPM), * on the other hand (because no camsync) it might take more than 1 camshaft rotation during cranking at low RPM for first pulses to appear (suddenly many than), you prolly noticed this; that is OK. |
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* tdc delay is 107 deg
* angular width of tooth = 90 deg. |
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* angular width of tooth = 90 deg.
* TDC delay is 107 deg (=90+17; so 17 crankdeg after next trigger pulse) ** should be max 89.5 crankdeg (45-60 is probably best if possible) |
| * trigger from rising instead of falling if that moves tdc delay down to recommended simple trigger 60deg. |
| * trigger from rising instead of falling if that moves TDC delay down to recommended simple trigger 60deg. |
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** It is very common to have one edge (the candidate is the rising edge in this case) at 80 .. 82 crankdeg, that is 8-10 BTDC ... Where such simple trigger was applied, factory engine management usually used that edge for cranking ignition timing (that is good engineering practice).
** actually dead-on spark timing during cranking is essential for kickstart motorbikes (even if this V8 is prolly not that kind :-) ** in the extremely unlikely case trigger HW cannot be set (with either rising /falling edge) properly to "TDC after the trigger" = 45..89.5 crankdeg, (but say 30 deg) it might require some config cheat (eg set 0..30 in spark timing table and cheat it to actual 10..40 BTDC). Should not be needed. |