The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: jonathanrowley on June 18, 2016, 03:48:08 AM
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So just back from a first 5 mile jaunt to test the newly upgraded Enduralast 450W charging system.
Seems good, charging at 13.7-14.4V at low revs, Alternator can be heard whirring away and the Bikes former banging and popping on the overrun seems to have gone away?
I couldn't believe it at first, but took it up and down to hi revs to see if I could make it exhibit the banging and popping on the overrun reported on an earier post - but nothing?
I've not touched the timing or mixture or even sealed the short pipes as previously suggested.
Just removed the Diode board and old Rotor and replaced?
Bike was obviously not charging previously.
Am I making this up - why would the new Battery and working charging system affect sparks and banging on the overrun?
Any ideas you expert types?
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If the system wasn't charging before then the voltage seen by the ignition coils would have be quite low, probably a little under 12 volts.
With the new charging system the ignition coil will be seeing up to 25 % more voltage. As spark energy increases with the square of the current or applied voltage then the improvement in spark energy is in excess of 50%. That could well be enough to ignite the weaker overrun mixture and eliminate the popping.
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Barry - thanks, I couldn't work out an answer to this, but yes makes sense when you lay it out like that..
It definitely was not charging, never has I think - meaning the Batteries - 2 so far - now 3 with the new one, just discharged and died over time - amazing, as I've been running the Bike for 2 years with re-charges and an oxford maximiser to keep it moving.
50% more Ziggies is certainly making a big difference.
The bike has pretty much been re-built now electrically - new Coil, ICU, Bean Can, Charging system and Battery. Feels like a different machine.
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Here in Texas, we explain the how and why of such miracles by saying, Don't look a gift horse in the mouth.
Ride Happy!
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Yup, I'd say Barry's theory is likely the explanation - you weren't getting consistent, reliable ignition before, so some cycles were pumping some combustible fuel mixture into the exhaust system on the overrun
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Makes total sense - thanks guys, happy with the outcome and a side affect of the charging upgrade it's always popped since built 2 years ago. So a result.