Vent Crankcase or Deal With Oily Air Filter?

[DrSpencer]

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

[GLFLSTCI02]

Its not so much the smag in the filter as it is the stuff that gets past the filter.  When I took my induction module off this winter the inside looked like the inside of the smokehouse, lots of carbon on the pistons too. When you have a catch can on there you get a good look at the crud you have been feeding the motor. I have not had to clean the IAC since installing the can either.

Generated

[Soft 02]

Once you ditch the PCV going in the AC and get rid of the oily K&N you get a nice and clean TB and slow the buildup in the cylinders. IMO its worth it.

[Admiral Akbar]

Once you ditch the PCV going in the AC and get rid of the oily K&N you get a nice and clean TB and slow the buildup in the cylinders. IMO its worth it.

You get rid of the valves in the heads?     What are you calling PCV?

Max

[Soft 02]

The breathers are the positive crankcase ventilation and meant venting them to atmosphere. Not routing them to the intake.

[Nowhereman]

On my 127, I vent the crankcase and vent the heads.
I still get some oil into the filter but not a lot.

[Admiral Akbar]

The breathers are the positive crankcase ventilation and meant venting them to atmosphere. Not routing them to the intake.

OK just the re-route...

Max

[FXDBI]

Got mine out of the air cleaner the day after my warranty expired. No engine like that kind of oil run in thru the intake.  Bob

[02roadcling]

Intakes suck, if you pull and reroute you might not even get oily hose ends.

   cling

[saddle tramp]

Anyone have any opinions about the head vents. Are the new stamped steel top vents really better than the older aluminum one's ?

[rbabos]

Anyone have any opinions about the head vents. Are the new stamped steel top vents really better than the older aluminum one's ?

Yes they are a bit better. They seem to carry less oil through them while venting.
Ron

[saddle tramp]

Thanks Ron, anyone else have an opinion on this ?

[DrSpencer]

When people say "venting to the ground/atmosphere", where exactly are they venting to?

Does the oil/mist have the potential to spray elsewhere on your bike, possibly the rear tire?

Thanks

[Soft 02]

When people say "venting to the ground/atmosphere", where exactly are they venting to?

Does the oil/mist have the potential to spray elsewhere on your bike, possible the rear tire?

Thanks

The one I use the mounting bolts are the breathers. Rarely ever get anything more than a light residue. Ive drilled the rocker supports and use the stamped steel valve assy. Seems to be working well.

[mattVA]

I don't vent mine to atmosphere, but don't fill oil to full mark either. But just a 96" with cams. I don't notice a lot in the filter when I take it off.

If I had more money in the engine? 

[DrSpencer]

I have a 2011 103" Street Glide w/255's & updated breathers.

I run a 1/2 qt. low and still get a little dribble.

Thanks

[FXDBI]

Built my own adaptors from the original bolts and run it to the ground putting in a catch can this year. Drilled the rocker boxes and put the new vents in when I did the heads. Bob

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[r0de_runr]

My solution...

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[DrSpencer]

When you vent the crankcase to a small filter that hangs below the air cleaner, does the small filter fill up and drip (just like the air cleaner)?
Thanks

[rbabos]

When you vent the crankcase to a small filter that hangs below the air cleaner, does the small filter fill up and drip (just like the air cleaner)?
Thanks

If it's an oil barfer from excessive blowby, yes. Good rings and little blowby they stay reasonably clean for a long time. Condensation tends to accumulate in them in  cool weather though and they get wet.
Ron

[HDMG]

I don't see how the level in the oil pan will make any difference as some posters responded.
Regardless of the level, the oil pump is still pumping the same quantity of oil into the rocker boxes.
In my opinion the problem is the tiny drain holes that are drilled into the rocker arm support plates below the umbrella valves that are supposed to let the excess oil drain back into the top of the rocker box and back down into the oil pan.
The stock holes are about the size of the hole in a sewing needle.
When I did my engine build over the winter I drilled the drain holes out to 1/8".
I haven't had even a trace of oil going into my breather, nor has the oil level got down at all.

[Nowhereman]

I don't see how the level in the oil pan will make any difference as some posters responded.
Regardless of the level, the oil pump is still pumping the same quantity of oil into the rocker boxes.
In my opinion the problem is the tiny drain holes that are drilled into the rocker arm support plates below the umbrella valves that are supposed to let the excess oil drain back into the top of the rocker box and back down into the oil pan.
The stock holes are about the size of the hole in a sewing needle.
When I did my engine build over the winter I drilled the drain holes out to 1/8".
I haven't had even a trace of oil going into my breather, nor has the oil level got down at all.

Yes, opening up those holes does help.
Not everyone has a tight motor when doing the hole opening thing.
Some of the aftermarket heads do have larger openings than factory also.

[DrSpencer]

I prefer the small filter being mounted below the air cleaner, where I can see it.

Are there any disadvantages to using this type of setup (offered by DK)?



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[88b]

I used to get a few drips out of the air cleaner if I got on it or ran at 85 mph for a long time. No more problems now.

[DrSpencer]

Something that never occurred to me; how can I externally vent when using a SE Stage I intake?

Thanks