I don't have the answer but owning and flying aircraft for 30 yrs if its filled to the top level mark it will blow out 2 qts in 6-8 hrs everytime leave it at 2qt low mark stays there for next 30 hrs .Now it holds 12 qts of oil. Also air cooled engine. Not saying it relates but I know for fact with those engines it made a difference
This has been exactly my experience in the baron with Continental IO-470 engines. The full mark is 12 quarts. Fill it to there and two quarts of oil wind up under your wings and the dipstick will stay at ten quarts until the next change - 25 to 30 hours.
I do not know if there is a direct correlation to Harley engines but with all engines, I have always been told that it's better to be ha lf quart low than high.
I've had Evo's, Blockheads and M8's since the mid 1980's. They all puked oil into the air cleaner. Until my current 115th Fatty, I routinely did a breather bypass using either a hose and small air filter or catch can. Usually under the bike or hidden in another location. My greatest objection to the Motor Companies archaic breather system was the mess the oil puking made on the bike. I considered bypassing the system on my 2018 Fatboy but after discussing the issue with my usually warranty friendly dealer service manager, I decided on a Harley Heavy Breather to eliminate the oil spatter issue emanating from the air cleaner. I'm very happy with the result because the mess is completely eliminated and I've forestalled any possible warranty problems resulting from unauthorized mods. Granted, the oil mist still goes into the engine, but I'm not worried about that if the Harley engineers aren't.
If those Harley engineers could get away with it they would be doing the same thing a lot of us are doing, vent that stuff out into the atmosphere. They know that it just builds up on top of the pistons, but the EPA has there hands tied.
I've had Evo's, Blockheads and M8's since the mid 1980's. They all puked oil into the air cleaner. Until my current 115th Fatty, I routinely did a breather bypass using either a hose and small air filter or catch can. Usually under the bike or hidden in another location. My greatest objection to the Motor Companies archaic breather system was the mess the oil puking made on the bike. I considered bypassing the system on my 2018 Fatboy but after discussing the issue with my usually warranty friendly dealer service manager, I decided on a Harley Heavy Breather to eliminate the oil spatter issue emanating from the air cleaner. I'm very happy with the result because the mess is completely eliminated and I've forestalled any possible warranty problems resulting from unauthorized mods. Granted, the oil mist still goes into the engine, but I'm not worried about that if the Harley engineers aren't.
we have 2 17 oil cooled 107s, both under ESP and SE Stage 1 using the SE High Flow ACs..they both were pretty messy at times..considered doing as you did going the SE HB route at $400 apiece to mitigate or hopefully eliminate the external dribble mess. But then was informed they updated the vent tubes in the Hi Flow kits so we tried that for $20 apiece..after 6000 miles we have yet to experience the external messes we had with the original tubes. The tubes allow the oily residue to make it into the intake to be consumed more efficiently. So there's the trade off, less external mess means more internal consumption but as you also mentioned, I'm not worrying about it or fussing with it. If the internal build up during the 5 year ESP coverage presents running condition issues we'll let the MOCO deal with it for $50 apiece. mine with 30,000 miles has been fine but wife's had heads replaced under warranty at ~20,000 miles due to excessive carbon. The difference between hers and mine I believe, can be attributed to me being much more heavy throttle handed than she was. We discussed this after her rebuild and since then she has been wringing it out a lot more so I believe the old adage of 'burning the carbon out' still holds true.
"I believe the old adage of 'burning the carbon out' still holds true."
I agree! I've been riding my Harleys more on the aggressive side for many years and carbon has not been an issue.
Keep oil level 1/2 to 3/4 on the stick I still have to clean air filter oil mess out every now and then but I don't mind.
Being pro active maintaining a Harley has always been standard procedure.
I installed a breather kit on my '17 RKS about 10000 miles ago. I purchased my kit from DK customs and I retrofitted onto my SE Ventilator AC. The bike doesn't seem as sensitive when it gets hot out and always runs crisper and snappy compared to before I installed. The pictures below are showing the dispersed 'crud' after roughly 500 miles.
I installed a breather kit on my '17 RKS about 10000 miles ago. I purchased my kit from DK customs and I retrofitted onto my SE Ventilator AC. The bike doesn't seem as sensitive when it gets hot out and always runs crisper and snappy compared to before I installed. The pictures below are showing the dispersed 'crud' after roughly 500 miles.
Wow thats a lot of crud,do you do lots of short trips in cool weather/or long rides in hot weather,just curious mate
cheers bro
This sample was from a little of both riding conditions. We were transitioning into winter when I took this sample. This was basically one 300 mile ride in 80 deg temps and then multiple short 40-60 mile rides in 50-75 degree temperature ranges. I haven't noticed an increase or decrease based on temps or with short or long rides. It's been a pretty consistent amount regardless. I use Redline synthetic oils just fyi.
11-03-2018, 05:02 AM
