Hey all,
Did a build on 2 bikes, '04 road king and '06 electraglide classic. Took 'em to 95 cid and installed S&S 585G cams and put power commanders on both. Put some miles on 'em and took both to the dyno back to back, same dyno same day. The '04 ran 60 hp and 85 tq while the '06 ran 85 hp and 96 tq. Here is a rundown of what we have done to find the solution. Changed plugs and wires,swapped exhaust between the 2 bikes,adjusted push rods,checked compression (165 back cylinder and 170 on the front), work was done at a shop so we pulled heads ourselves to verify it WAS a 95,pulled cam cover and verified cams are 585g (stamped on end of cam) and verified cam timing. Next step we are going to pull the cam plate and check the lobes for proper lift and to double check the cam chest. We have considered a bad injector however during the 4 dyno runs done on the bike the air:fuel ratio has held steady at 14:1. The bike feels good seat of the pants and runs 100 mph+ but the 20% power difference in the 2 bikes is huge considering the same parts. So....who has the magic answer? Thanks in advance.

VBP

 

the 06 dose have a little better port on the heads. maybe not 20% worth, but worth consideration

 

you did'nt mention anything about the maps on the powercommanders. same maps or very similar?

 

I am going to my dyno guy in the morning and get a new printout of both the dyno runs and the PC maps to compare. Will post the results. I am assuming they would be close given the same parts but I have been told there is a difference in the stock ECM between the two bikes. We shall see.

VBP

 

There is a HUGE difference between the the 2 exhaust ports on those, as well as the later heads have a raised intake floor to help with cylinder fill.
How much oil carry-over, do you have in the cases on each??
Scott

 

Did you check for sumping?

 

4-6 oz's is what you you should see.
8 is not the end of the world, but after that power losses start showing up.
At 16-18 oz's, we have witnessed as much as 25-30 hp loss, as the left side flywheel, that is machined/notched for the crank position sensor, acts like a paddlewheel, when wallowing around in that much oil.
The dyno report will a-typically have a good initial "strike", then as the rpm's build, the power will fall off, at about a 30 degree angle, or greater.
The culprit is, 99 times out of 100, the "O" ring behind the pump, causing bleed off into the cases.
Scott

 

As others have suggested, I would be looking for sumping. A sumping motor also will tend to heat up faster and run hotter than a non-sumping motor. I have seen 26 oz. come out from a sumping 107" that had the wrong o-ring installed at the scavenge port. It's like dragging a boat anchor; have you ever tried to run in waist deep water? Same thing.

 

Never heard the term "sumping". I have an assumption of what it is, can you explain it and how I go about checking it? I am thinking it means excess oil in the cam box, crankcase and or primary? I opened the cam box and got a very small amount of oil drainage, guessing a couple oz, not enough to cover the bottom of my drain pan.

VBP

 

"Sumping" is what happens when the oil pump is not scavenging the oil out of the engine case "sump". As Scott said, it is usualy caused by a dislodged O ring at the back of the oil pump. Carefully remove the pipe plug from the bottom of the engine case, and measure the amount of oil that comes out.