Head Breathers

[conmag]

 My first M8,is it ok to run the head breathers to the ground and not into the intake?

[rigidthumper]

I'm sure that's a violation of some EPA rule, but a lot of guys are doin it

[Hossamania]

Do you mean like this?
Yep. It is often encouraged.

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[IronButt70]

Would venting to a catch can violate EPA rules. Asking for a friend.

[Hossamania]

Would venting to a catch can violate EPA rules. Asking for a friend.

Technically, yes.

[Ohio HD]

Would venting to a catch can violate EPA rules. Asking for a friend.

Technically, yes.

Not if the catch can vents back to the motor, or air breather.   

[Hossamania]

Would venting to a catch can violate EPA rules. Asking for a friend.

Technically, yes.

Not if the catch can vents back to the motor, or air breather.   

Good point.

[Ohio HD]

They're all the rage on high revving four and six cylinder vehicles. They're baffled to keep the earl in the can.

[Hossamania]

Fancy!

[Deye76]

If I pull the dipstick on my M8 Softail (2020 Lowrider S) start the bike with a balloon over the oil filler spout it blows the balloon up quickly. Do I need to vent the top trans cover, or the air cleaner breather bolts to a catch can, or both?   

[hrdtail78]

With a seal in between the crank and rest of the cavity. What does the balloon test tell us?  Crank cavity vacuum should not effect pressure in rest of case.  I would also consider that free flowing a oil cap size hole will effect how the check valves work.  How much psi does it take to make a balloon 2 inch in diameter compared to 3 inch?  IMO the balloon test is air volume and the volume of air is always going to be dependent of displacement of engine.

A better test would be hook a gauge up to the many oil caps offered with a hole and hose or make one like it.  With long enough hose.  You could hold on lap and check at different steady state rpm as well.

[Deye76]

Not looking to measure anything, just want to relieve some crankcase pressure, thanks for the reply. 
 Talked to a few who have bikes like mine, they vented the trans cover only, think I'll try that.

[roadkingdresser]

Are they venting the stock tranny cover? Any pictures?

[Hossamania]

Are they venting the stock tranny cover? Any pictures?

The stock cover is vented.
Link to Ronnie's, go to transmission housing, part #10:
https://partsfinder.onlinemicrofiche.com/ronnies/showmodel/13/harleydavidsonmc/1410#

[Deye76]

Are they venting the stock tranny cover? Any pictures?

The factory has a separate passage in the trans case to the oil tank for crankcase pressure, but it still causes excess oil to exit via the head breathers (EPA) venting the trans cover to the atmosphere will alleviate. One could modify the OE cover, but it's plastic, so Trask makes a nice set up, albeit pricey, and more for a Softail I think than a bagger that has a different dipstick spout.

[cheech]

Are they venting the stock tranny cover? Any pictures?

The stock cover is vented.
Link to Ronnie's, go to transmission housing, part #10:
https://partsfinder.onlinemicrofiche.com/ronnies/showmodel/13/harleydavidsonmc/1410#

I think this Trask vented trans cover or venting the cover oneself has people confused.
The vent Hoss is referring to is the OEM TRANS vent. Vents the trans cavity to atmosphere.

All the other "venting" methods such as the Trask top cover are venting the OIL TANK to alleviate tank and therefore crankcase pressure to atmosphere which is not the way the OEM ENGINE venting works.
The vent in the Trask trans cover leads to the OIL TANK cavity not the trans oil cavity.

Same as the vented dipstick routine, just another method to achieve the means.

[Hossamania]

Vented dipstick

[Deye76]

The link from Hoss can't be used on Softails.

[Hossamania]

The link from Hoss can't be used on Softails.

I didn't know that, thanks for the info.
Can you do something similar with a modification to your dipstick?

[Hossamania]

Try This one.

[Fat11Lo]

Is it an option to vent the filler neck "T-Man style", he has a you tube video on how to install his kit but it's not hard to come up with the pieces yourself.