I'm running out of things to check. I had a complete bottom end rebuild done on my 08 Street Glide. I had a Jim's 4 5/8" crank installed, the Timkin bearing conversion was done and the cases were bored for 4.125 pistons. I had the heads done, and new valves and springs. I assembled it with new cylinders and pistons and a new stock oil pump. I fired it up with no problems heat cycled it a few times and took it to a tuner in the area.
He called the next day and told me it was sumping. He took the cam chest apart and I had put the wrong O ring on the scavenge side of the oil pump when I put it together. OK simple enough right, NOT. He called back the next day to tell me it was still sumping. I trailered the bike back home, ordered a Feuling cam plate and oil pump. Put it back together and it still sumped. I pulled the oil pan everything was clean and clear. I started following the oil path and found that the port from the sump back to the scavenge side of the oil pump seemed to be blocked. I pulled the motor back out, split the cases and found what was left of a black ty-wrap in the crank case. I wasn't happy but at least I had found the problem, or so I thought, NOT.
I blew out all the oil passages, made sure the cam plate and the oil pump were clear and reassembled the motor again. I noticed that the oil pressure at start up seemed a little higher than before, 50lbs at idle cold. I let it warm up and then took it for a short ride, maybe 2 miles. Everything seemed fine and I thought once again that all was good, NOT. It was still sumping, so bad the oil gauge was all over the place 10lbs to 35lbs. I figured I missed a piece. I tore the motor down again and found nothing, its spotless inside. I blew out the came plate nothing, dissembled the oil pump, clean.

What am I missing?

 

OEM cam plate?
Scott

 

Feuling cam plate and oil pump. 8015 if memory serves me right.

 

I'd pull that plate and install an OE plate.
Out of all the engines we build here, day-in/day-out, we use OEM cam plates.
S&S will agree, as will Bob Wood.
Scott

 

Well that's not exactly what I expected but I had thought about doing that just to eliminate the pump and plate as a problem. I have the OEM plate and a brand new stock pump. no harm in trying.

 

We've witnessed by installing the OE plate/pump in instances such as this, the guys are good after that.
Scott

 

I hope your right Scott but my concern is that I had sumping when I first put the motor together with the original OEM plate and a brand new OEM pump. That's what prompted me to try the Feuling parts as a remedy.

 

Even though I did not catch that you had done that in your original post, I still eliminate the billet plate, and INSURE that the blind "O" ring does not get disturbed upon install.
Shy of that, Thayers Sales & Service, in Corfu, N.Y. may be a source that could help, with their 3-stage oil pump.
Scott

 

Yea that's not going to happen. I'm not throwing any more money at this till I have a better understanding of why what I have now doesn't work. Tonight I'm going to reassemble everything, do a compression check to make sure I don't have a ring seating issue muddying the waters with blow by into the sump and then move on from there.

Thanks for the suggestions so far and stay tuned for more questions.

 

Well It looks like I concentrated my efforts in the wrong place once again. Once the debris was removed from the crankcase and the sumping didn't improve I continued to follow the path of oil both feed and scavenge. When I got around to following the airflow, specifically the crankcase venting that goes threw the head I found a previous mod I had done to re route the vent to the ground rather then the intake (don't tell the EPA) had caused too much restriction. I guess the additional bore and stroke of the 124" made a marginal mod worse. Last night after re drilling the two breather bolts going into the heads I was able to make several trips around the block traveling 25 to 60 mph with no issues and solid oil pressure. I came into the driveway and directly onto my lift table to hold the bike upright. I immediately drained the sump, and got about 3 1/2 oz.

Back to the tuner in the morning.

Scott thanks for your time.