Guys,
When an electrical problem accur it's for me a trial and error to find the cause. In the past when installing a radio in my car often the fuses were blown
Nowadays internet helps me a lot.
Before i go to the experts, i hope you guys can help me to find the cause and also advice (to learn).
For a couple of years i had no (electrical) problems, but last year two trackdays ended in a DNS with my track TT1.
See:
https://youtu.be/okg1_zeFUfg (don't mention the rev. counter, i know
).
From cold, the bike starts good and runs great. But after the warmup lap (appr. 5 km) suddenly the motor runs very bad and bangs when revving. it looks like it's the back cilinder. Then, if you wait for 2 min., everything looks normal again with starting and revving, but only for a short moment.
I don't know why and what the problem is. Is it an alternator - r/r - ignition issue?
Some facts:
750 Sport engine
Ignitech ignition (TCIP4 + coils + pickups)
Ducati race alternator 1 phase
Shindengen sh579b-11 rectifier (3 phase)
Some tests:
Battery voltage when idle and when revving: constant 14,3V
Resistance r/r and alternator: 0.1-0.2 Ohm
Tested the regulator with the diode setting. One yellow wire connected to the stator and one not connected showed a 630-630, one connected to the stator 595, a little ∆. A problem?
I also tested an 1 phase original Ducati (18W) alternator, but less AC than the race alternator.
Ground looks ok.
Main question is what the problem can be. Some say it's the rectifier, when the engine gets warm, to much current and then fails with consequenses for the ignition. I'm not an expert, but i don't get that. How is that possible?
To learn:
- is it ok to connect a 1 phase alternator to a 3 phase r/r?
- what's the best setup for a trackbike? A 3-phase alternator and 3 phase r/r? Maybe a total loss system?
- any experience with the Shindengen mosfet or SH847 rectifier ? (should be much better (performance and less heat) than the "old" rectifiers),
- if testing total loss, should i dissassemble the alternator or is it ok to be mounted, but not connected?
Thanks for your help and advice!
William