There's an old saying, No news is good news. That very well may be the case in regards to the sumping issue and the 2020 Harley's. Once again Harley has made an oil pump change. Did they get it right this time? They have changed it so many times it has become a social media joke in the Harley groups. Maybe it's time to acknowledge that the sumping reports have all but vanished and look at what they actually changed this time. Here's some info a very good inside source shared with me. For 2020, the lobe count on the scavenge rotor has been reduced. The engineer claimed it changes the phasing of the suction pulse from the oil pump and the negative pressure in the crankcase when the pistons are going up. Apparently when these two opposite pulses get lined up together, the pump looses it's prime and starts to cavitate. Makes sense, but it almost sounds too simple. Same question, any confirmable reports of a 2020 sumping? Can I start doing big bore kits and cam installs again?
Steve@fullsac.com