Breather bypass
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Cruiser
Joined: Dec 2015
Posts: 118
Likes: 24
From: virginia
Breather bypass
So, after much research, I decided to modify the breather on my 04 heritage, to a catch can. Got a small alum can made from fuel filter, and with much ado, two brass 3/16 elbows. And what a PITA it was for a simple job. Drilled the aluminum housing inside the valleys for the elbows, no sweat. Then, with great work, file down the elbows so they would fit into the valleys and not interfere with the AC. So, then, using the nice tygon tubing, tried to fit it together. AAARGH. And, also ran the Seafoam spray thru the engine twice to clean the oil residue. I got some gray smoke, so it did something. But, now I am not dumping oil into the throttle body, that was mighty greasy to begin with. Thanks epa for nothing.
HDF Community Team
Joined: Dec 2011
Posts: 8,554
Likes: 3,978
From: San Diego, CA
Vehicle manufacturers have been venting crankcase vapors into the intake for decades before the EPA was even established, at least since WW2.
https://en.wikipedia.org/wiki/Crankc...ir%20pollution.
John
https://en.wikipedia.org/wiki/Crankc...ir%20pollution.
John
Last edited by John Harper; Oct 16, 2024 at 02:49 PM.
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,144
Likes: 11,219
From: San Diego, CA
Vehicle manufacturers have been venting crankcase vapors into the intake for decades before the EPA was even established, at least since WW2.
https://en.wikipedia.org/wiki/Crankc...ir%20pollution.
John
IMHO....
There is a difference between a "positive" crank case ventilation system and a "closed" crank case ventilation system.
Positive crank case ventilation systems, using a PCV valve, were first used on production cars in the 60's...
The EPA started requiring a "closed" crankcase ventilation system (CCV) for all engines in 2007.
So in spite of what Wikipedia says, the requirement for a CCV is the "fault" of the EPA, and just because positive & closed systems have been around for awhile, it doesn't change the fact that they are NOT good for the engine...
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,144
Likes: 11,219
From: San Diego, CA
I took my 2003 Heritage apart at 20K miles.
I had used a borescope and saw big build-up. I did a full can SeaFoam treatment into the intake. Quite a bit of smoke so I figured it did its job. The follow-up borescope looked to be improved, but still heavy deposits.
About 2 weeks after the SeaFoam, here is what I found:
My experience made me a believer in rerouting the breathers on all my bikes...
Last edited by hattitude; Oct 17, 2024 at 08:18 AM.
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Road Warrior
Joined: Jan 2006
Posts: 1,797
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I would love to have had those same results. That would be more than acceptable in my opinion....
I took my 2003 Heritage apart at 20K miles.
I had used a borescope and saw big build-up. I did a full can SeaFoam treatment into the intake. Quite a bit of smoke so I figured it did its job. The follow-up borescope looked to be improved, but still heavy deposits.
About 2 weeks after the SeaFoam, here is what I found:
My experience made me a believer in rerouting the breathers on all my bikes...
I took my 2003 Heritage apart at 20K miles.
I had used a borescope and saw big build-up. I did a full can SeaFoam treatment into the intake. Quite a bit of smoke so I figured it did its job. The follow-up borescope looked to be improved, but still heavy deposits.
About 2 weeks after the SeaFoam, here is what I found:
My experience made me a believer in rerouting the breathers on all my bikes...
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