Venting !
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,075
Likes: 11,096
From: San Diego, CA
Cleaned the air filter and rerouted my breather today and i must say not much air comes out of these new twin cam bikes. My evo had much more coming out. I think the hose is only something like 16 inchs long. Will see if i getany drops of oil on the ground like my shovel and evo had. Pan always had oil under it. No matter what it has to be better than letting all that crap build up in the engine.
Many people switch to an open crankcase breather system, just like you did... many different ways to do it, I would just make sure everything you do is downhill. That way no oil can "puddle" in a line and plug the breathers from venting...
I switched an '03 I've owned since new, to an open breather system. A borescope in the cylinder showed some ugly carbon deposits on the pistons.
I used a can of Seafoam. They have a can that pours into the gas tank and one that sprays into the intake. Get the sprayer one, and use as directed. Basically spraying the entire can into the throttle body, while maintaining 2k rpm. Make sure you are in a place where a bunch of smoke won't matter.... there will be smoke!
After one treatment, the pistons looked tons better. I will probably do another treatment soon, because they were so caked before the first treatment....
Thread Starter
|
Seasoned HDF Member
Joined: Oct 2012
Posts: 11,198
Likes: 3,028
From: St.Louis Mo.
Many people switch to an open crankcase breather system, just like you did... many different ways to do it, I would just make sure everything you do is downhill. That way no oil can "puddle" in a line and plug the breathers from venting...
I switched an '03 I've owned since new, to an open breather system. A borescope in the cylinder showed some ugly carbon deposits on the pistons.
I used a can of Seafoam. They have a can that pours into the gas tank and one that sprays into the intake. Get the sprayer one, and use as directed. Basically spraying the entire can into the throttle body, while maintaining 2k rpm. Make sure you are in a place where a bunch of smoke won't matter.... there will be smoke!
After one treatment, the pistons looked tons better. I will probably do another treatment soon, because they were so caked before the first treatment....
I switched an '03 I've owned since new, to an open breather system. A borescope in the cylinder showed some ugly carbon deposits on the pistons.
I used a can of Seafoam. They have a can that pours into the gas tank and one that sprays into the intake. Get the sprayer one, and use as directed. Basically spraying the entire can into the throttle body, while maintaining 2k rpm. Make sure you are in a place where a bunch of smoke won't matter.... there will be smoke!
After one treatment, the pistons looked tons better. I will probably do another treatment soon, because they were so caked before the first treatment....
The M8 engine routes the breather hoses up and over the top of the air filter, so who knows ? I agree with you about keeping the breathers on a down hill run if you can. THANKS !
One other thing while i'm thinking about this. I thought about running tubing from the hole where the factory breather line goes into the back of the air filter and spraying carb cleaner as i ride the bike. That seems like it would do a great job of cleaning the intake. Then when done curl it up and lay it in the box under the cover. Even two piece it so the line won't be very long and cap it off. Right now i have a plug with silly cone on it. I over think everything, but this sounds like a good idea.
Last edited by hardheaded; Aug 22, 2018 at 10:37 PM.
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,075
Likes: 11,096
From: San Diego, CA
It's funny you mention this.. Some people route their lines up and out the air box and then down to the ground. My lines remained level with the Y tied in and then down to the ground. Even a friends EVO engine with an S&S carb on it the hose runs uphill before going into the air filter backing plate.
The M8 engine routes the breather hoses up and over the top of the air filter, so who knows ?
The M8 engine routes the breather hoses up and over the top of the air filter, so who knows ?
I have seen many external breathers that route up & over something/somewhere... I have never heard of a problem specific to this.. BUT..
Just doesn't make sense in my mind, allow the possibility of oil to pool anywhere, that will need to be blown out by the venting crankcase pressure. I would think it would, best case, reduce the venting ability and worse case, partially if not totally block it...
Again, nothing scientific and or tested, just my gut feelings.....
Thread Starter
|
Seasoned HDF Member
Joined: Oct 2012
Posts: 11,198
Likes: 3,028
From: St.Louis Mo.
That’s what I did only I kept the T fitting. Used 3/16 line to the T fitting and drilled a hole in the bottom of the air box and routed the line to the ground. Found a plastic part that holds interior auto door panels on and used it to plug the hole in the air cleaner where the breather hose went. Put in a new air cleaner when I did mod.
After about 8K the air cleaner still looks new.
After about 8K the air cleaner still looks new.
Last edited by hardheaded; Aug 24, 2018 at 10:05 PM.
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,075
Likes: 11,096
From: San Diego, CA
We had this discussion yesterday while out on the bikes. So everyone is fine with 3/16 hose running to the ground ? The reason i ask is because every other bike i've had i used 3/8 hose, but they were evo's and shovels. 3/16 is the size of the factory hose that comes out of the heads. I just extended it 16 in. to the ground.. I was kicking the idea around of maybe stepping the hose size up after the y i installed inside the air box. . Any thoughts ? Is it really needed ? As i said before there is not much air coming out anyway.
As long as there are no physical restrictions, I would believe 3/16 hose to be OK....
Last edited by hattitude; Aug 25, 2018 at 06:30 PM.
Thread
Thread Starter
Forum
Replies
Last Post
OkieBill
Ignition/Tuner/ECM/Fuel Injection
5
Jun 22, 2016 12:51 AM
