Look Ma - No ThrottleBody!
Road Warrior
Joined: May 2014
Posts: 1,962
Likes: 245
From: Triune, TN
Fls I forgot to ask last time about the hard lines. What did you use for the attachment bolts to the engine? La dog has a good point, slow down the air by going up if there is any oil it will drain back down. As I was reading I was thinking if the lines go up then you would never get any oil of it. Wait a second that's the point.
There is very little to no oil in the catch can even when I thrash the engine. I would rather the milky oil (oil water mix) go to the can than have an opportunity to drain back to the engine though...only want clean oil there lol. We have ran breather systems on drag and stock cars for decades (since EPA came up with emissions restrictions in 74) and always vent down. The whole idea is to get the vapor out so I give it the smoothest route possible, I don't care if it has a spec of oil with it.
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Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
Likes: 189
From: 90210
^^ FLS is fine with his use and understanding of it- really it's more about how much the motor itself is puking oil out the breathers. some do it more than others. the routing lines upward is just a trick I learned from a pretty sharp builder of race motors. with higher internal velocity, higher vol oil pumps, more oil can end up in the rockers than can drain down fast enough and more of it comes out of the breathers. there are already air/oil separation passages / design inside the motor to help reduce oil out the breathers. routing lines upwards just provides another layer of air/oil separation. sometimes it is not needed. on my Big Dog, it is needed- when I rev that thing out for an extended period it puts quite a bit into my catch can. by routing up I reduced that by half. routing up does not guarantee no oil will come out, and you'd mainly see the tan honey looking aerated stuff.
On my HD, maybe not needed to route up. routing upwards may be my best design choice though for aesthetics - will see when I'm messing with it. for FLS, routing down looks good on the bike and no reason it would not work fine unless engine was overly puking.
On my HD, maybe not needed to route up. routing upwards may be my best design choice though for aesthetics - will see when I'm messing with it. for FLS, routing down looks good on the bike and no reason it would not work fine unless engine was overly puking.
Road Warrior
Joined: May 2014
Posts: 1,962
Likes: 245
From: Triune, TN
^^ FLS is fine with his use and understanding of it- really it's more about how much the motor itself is puking oil out the breathers. some do it more than others. the routing lines upward is just a trick I learned from a pretty sharp builder of race motors. with higher internal velocity, higher vol oil pumps, more oil can end up in the rockers than can drain down fast enough and more of it comes out of the breathers. there are already air/oil separation passages / design inside the motor to help reduce oil out the breathers. routing lines upwards just provides another layer of air/oil separation. sometimes it is not needed. on my Big Dog, it is needed- when I rev that thing out for an extended period it puts quite a bit into my catch can. by routing up I reduced that by half. routing up does not guarantee no oil will come out, and you'd mainly see the tan honey looking aerated stuff.
On my HD, maybe not needed to route up. routing upwards may be my best design choice though for aesthetics - will see when I'm messing with it. for FLS, routing down looks good on the bike and no reason it would not work fine unless engine was overly puking.
On my HD, maybe not needed to route up. routing upwards may be my best design choice though for aesthetics - will see when I'm messing with it. for FLS, routing down looks good on the bike and no reason it would not work fine unless engine was overly puking.
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Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
Likes: 189
From: 90210
Yeh well I hope I can get the tune dialed in that well- today will be first real day of tuning. keep fingers crossed. for my big dog I need to pull the rocker boxes and drill out the oil drainback passages wider. been to lazy to do it. just dump the catch can once in awhile I have one of those nifty billet catch cans with a valve on the bottom.
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Outstanding HDF Member
Joined: Jun 2014
Posts: 3,185
Likes: 189
From: 90210
BTW did a test run today with the new tune- holy CRAP. definitely all 100% good. bike is pretty damn fast and pulls like a train. light up tire at stop light? no problem-o. ;p that 5ommTB and 4.9 injectors do make a difference. bike even sounds different (meaner).
Much thanks to one of the long time tuners here on the forum for working with me on adjustments. and those of you who let me peek at your similar build tune files.
Much thanks to one of the long time tuners here on the forum for working with me on adjustments. and those of you who let me peek at your similar build tune files.
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