KTM LC8 engine. 4-stroke, 75-degree V2, odd-fire. 950/990cc
EFI version has 24-2 crank trigger. No camshaft sensor.
TDC info needed (here)
It`s hill-climb motorcycle and race is very soon!
- Maybe you can dig up the exact timing info even sooner (that's considered a starting point for discussion : "I'd like to set up timing for the 2 cyl, TDC-s are at ..., ... degrees after tooth0 (tooth0 is the first tooth after the 24-2 missing gap)".
- Maybe there is a crankshaft on the shelf, that could be measured, (even if info found: verification is good) 75 deg + offset crank ...
[KTM LC8 engine repair manual]
Special trigger tooth reference table ?
- it's possible to set up with per cyl spark delay (and evenly placed reftooth) and get it running (see below)
- when the TDC info is clearly published here (also: how it was acquired and verified), perhaps some more refined, even better (more precise) approach could be provided for smoother startup (not a big difference with running engine, but could help cranking when angular-velocity variations are more significant).
Hello Elbe,
Please create a sharing report containing your current config (vemscfg) and triggerlog of engine cranking 8-10 seconds without ignition and injection fuse and i'll take a look at what is required to get it working.
Best regards Vems Dave
Thanks! I will do it tomorrow.
I found shorter triggerlog file:
http://www.vems.hu/files/ElbeEngineering/KTM_lc8_24minus2.triggerlog
Config:
http://www.vems.hu/files/ElbeEngineering/Config_KTM_LC8.vemscfg
Dave, was it helpful or I have to get longer trigger log?
Hello Elbe
Sorry i missed your edit (it helps if you provide a bit more text in the summary of change box so it stands out, just "edit" is easily missed)
According to my review the engine should be able to run without any firmware mods; the longer triggerlog without IGN and INJ fuse should provide a bit more info on this, please keep spark plugs in the engine so i can see compression phases also.
Review of triggerlog KTM_lc8_24minus2.triggerlog:
- 24 minus 2 correct
- odd fire engine with tdc at around tooth 14 and tooth 19
- rotation period around 180 msec for 360 degree
- tdc time diff 232, 150, 236, 149 msec (roughly)
- this translates to 220, 140, 220, 140 tdc crank degrees offsets (roughly)
- it seems you might get away with delaying the second ign index using the spark delay function in base setup -> cyl separated spark delay, around 45 deg should do it.
If you run into any trouble please let me know and supply new triggerlog / vemslog; i'll review and provide hints on how to proceed.
Best regards, Dave
Thanks!
Is this error normal? I can try these settings on bike in one hour.
Reference tooth:
0 - 14
1 - 19
Next trigger tooth - 19 (is it correct?)
Hello Elbe,
It seems you misunderstood my instructions, do not adjust anything from "Config_KTM_LC8.vemscfg" so start from your original config and only change delaying the second ign index using the spark delay function in base setup -> cyl separated spark delay, around 45 deg
Best regards, Dave
Dave, I need cylinder separated delay approx 75-degrees. At the moment 63.75 is maximum. Otherwise it should work.
63.75 degrees of delay is close but not enough.