I see lots of stock Twin Cams happily running down the road.

Is it worth the effort to vent the crankcase elsewhere, besides back into the air filter/throttle body?

Is the oily filter anything to genuinely be concerned about, or is it just an inconvenience?

Thanks

 

I think thats basically just snake oil unless you own a shovelhead.

 

I don't get it. What's the issue?( I'M A NOOB)

 

http://en.wikipedia.org/wiki/Crankcase_breather

I think if you have your oil filled to the proper level and you still have issues whereby this is excessive, venting outside of the throttle body is just treating symptoms and you still have an issue to deal with.

Under normal circumstances, this oil mist is quite minimal.

 

I've owned a bunch of twin cam bikes, and all of them did this to different extents. I know that engines don't like to burn regurgitated oil and water vapor. It is a perfect scenario for excessive carbon. I vented mine to the ground, and my engine is better off for it. Will it be detrimental to the longevity of your engine if you don't? I'd say somewhat, but to what extent is anyone's guess. If nothing else, it will keep both the inside and outside of your engine cleaner....

 

I vent my StreetGlide to the ground as well (also my FatBoy, Buell X1, and my Audi A4).

 

I drilled and tapped into the transmission and just recycle the oil from the vented hoses….
J/K

 

It hurt's nothing. Leave it alone. The little oil just adds to the filter's ability to catch dirt. Little oil goes into the intake since that is actually coming from it collecting in the hoses and running down. Mostly just crankcase pressure air goes into intake. It's also a 10K fine to modify it but no one enforces that..sort of like the government's no call system. Just wipe the drool off the old girl's chin and keep getting up. My 1100 Custom runs it into the air box and on the bottom of the box is a short hose with a drain plug. Of course, there is still oil in the box. I just wipe it off when checking filter.

 

Tear your heads off and see what oil mist does to the top of your pistons. I did and now vent to the atmosphere. Low flash point oil vs hot aluminum isnt a good combo.

 

As has been said above, if everything is in good shape, there shouldn't be a problem with it.

By the time I had 35K on my 2013 I did have excessive oil coming out the breather. The HD shop replaced the umbrella seals under warrenty and I just took a 700 mile trip in 90+ temperatures. A lot of the way I was doing 75 to 80 MPH and didn't have one drop of oil on my cam chest when I got here.

It seems like the seals need to be changed yearly (at least for my mileage), so I hope to get them to do it one more time under warrenty. I guess I'll have to dig the manual out after that.