Background
Here's what I've researched (notice some may be here say as you can't believe everything you read on the internet):
"
The breather re-route should not hurt your engine as far as crankcase gases no longer being drawn into the intake - even cars before emissions were in place, just let crankcase fumes/pressure escape to the atmosphere.
However, the vacuum produced by the intake will create a negative pressure environment in the crankcase and help evacuate gases and moisture. Additionally, depending on how much vacuum exists, the rings *could* seal better, leading to less blow-by.
Another method used to create negative crankcase pressure is by placing the vent into the exhaust at an angle, where the passing exhaust gases pull the garbage from the crankcase via the venturi effect. Notice that in this case, an oil mist/air separator is used to prevent oil from entering the exhaust system.
"
Over the weekend I have decided to leave the vent going to the intake, however I have added an oil-mist/air separator and catch can (which I have might have to improve on a bit) between the vent and the intake, much like pamver posted a few posts ago. I have left both lines going into the intake, but added a much less restricting filter to each hose. I will be checking these two filters to see how well my solution is doing by catching the oil-mist.
Procedure:
I started by making my own oil catch can/oil mist-air separator. I wanted something that I could hide pretty easily, however nothing is really available. I found a fuel filter at Autozone ,ff780, which should fit the bill.
I wanted to place it by the oil cooler, however the can is slightly too large, so I cut it down to size.
I then proceeded to rip the filter element out of it and packed two copper scrubber pads inside to act as the oil mist separator.
Before JB welding the bottom back on, I drilled a hole into the bottom to mount my drain. Make sure you can completely open the drain before permanently affixing it.
As with the breather re-route, gain access to the crankcase breathers below the airbox. I disconnected the two factory lines and switched the two, placing the short line on the front cylinder. I then placed a Tee a few inches from the front cylinder vent and ran a line down to beside the oil cooler.
I then ran a second line back up to act as my suction.
I decided to use both factory holes for my outlets to maximize the suction surface area and hopefully get the most vaccum to the crankcase and I will have some restriction there due to the scrubbies.
I also purchase two smaller fuel filters which I cut apart so that I could use the inner filters to catch any oil that may get past the separator. I'll check it over the course of the next week or two to see if I get any oil build-up as I ride the bike to work.
I didn't take any pictures of me painting flat black with high temp paint, but here is the result.
I do get some bucking at sub-2k RPM, however with a careful throttle twist it is very manageable. I have done the TPS reset and static timing adjustment and have been waiting on doing this project and getting my K&N filter in (on the 19th - so no hating on the dirty nasty filter!!) before starting to log any data.
Also, my oil mist separator, could also be used as a regular catch can if you'd like. Oh - currently, I didn't think too far ahead - but it's hard to drain the catch can in this position due to the location of the drain, however moving the catch can around or a different mounting system will fix this.
Let me know what you guys think!
Ben K.
Here's what I've researched (notice some may be here say as you can't believe everything you read on the internet):
"
The breather re-route should not hurt your engine as far as crankcase gases no longer being drawn into the intake - even cars before emissions were in place, just let crankcase fumes/pressure escape to the atmosphere.
However, the vacuum produced by the intake will create a negative pressure environment in the crankcase and help evacuate gases and moisture. Additionally, depending on how much vacuum exists, the rings *could* seal better, leading to less blow-by.
Another method used to create negative crankcase pressure is by placing the vent into the exhaust at an angle, where the passing exhaust gases pull the garbage from the crankcase via the venturi effect. Notice that in this case, an oil mist/air separator is used to prevent oil from entering the exhaust system.
"
Over the weekend I have decided to leave the vent going to the intake, however I have added an oil-mist/air separator and catch can (which I have might have to improve on a bit) between the vent and the intake, much like pamver posted a few posts ago. I have left both lines going into the intake, but added a much less restricting filter to each hose. I will be checking these two filters to see how well my solution is doing by catching the oil-mist.
Procedure:
I started by making my own oil catch can/oil mist-air separator. I wanted something that I could hide pretty easily, however nothing is really available. I found a fuel filter at Autozone ,ff780, which should fit the bill.
I wanted to place it by the oil cooler, however the can is slightly too large, so I cut it down to size.
I then proceeded to rip the filter element out of it and packed two copper scrubber pads inside to act as the oil mist separator.
Before JB welding the bottom back on, I drilled a hole into the bottom to mount my drain. Make sure you can completely open the drain before permanently affixing it.
As with the breather re-route, gain access to the crankcase breathers below the airbox. I disconnected the two factory lines and switched the two, placing the short line on the front cylinder. I then placed a Tee a few inches from the front cylinder vent and ran a line down to beside the oil cooler.
I then ran a second line back up to act as my suction.
I decided to use both factory holes for my outlets to maximize the suction surface area and hopefully get the most vaccum to the crankcase and I will have some restriction there due to the scrubbies.
I also purchase two smaller fuel filters which I cut apart so that I could use the inner filters to catch any oil that may get past the separator. I'll check it over the course of the next week or two to see if I get any oil build-up as I ride the bike to work.
I didn't take any pictures of me painting flat black with high temp paint, but here is the result.
I do get some bucking at sub-2k RPM, however with a careful throttle twist it is very manageable. I have done the TPS reset and static timing adjustment and have been waiting on doing this project and getting my K&N filter in (on the 19th - so no hating on the dirty nasty filter!!) before starting to log any data.
Also, my oil mist separator, could also be used as a regular catch can if you'd like. Oh - currently, I didn't think too far ahead - but it's hard to drain the catch can in this position due to the location of the drain, however moving the catch can around or a different mounting system will fix this.
Let me know what you guys think!
Ben K.
