|Posted on Tuesday, September 02, 2008 - 12:02 pm: ||
I have an '03 XB9S.
My question is this: While I understand the obvious benefits of re-routing the breather lines out of the air box and not having our engines re-burn the spooge, has anyone experienced negative effects in how your engine runs after such a mod?
Here's my hang up- a PCV (positive crankcase vent) valve always has the hoe running into airboxes- where there is vacuum. It would seem to me that a system with such a design would need said vacuum to function properly. Perhaps it's not enough vacuum to amount to anything, but I would suspect that for a properly operating system you would need it.
My thoughts on an alternative? Maybe a couple of small filters capping off the stock lines INSIDE of the air filter. This would give vacuum still, but filter the spooge, which can in turn run back down into the motor.
In the meantime, I have done this: I noticed that I really only get any oil coming out of the rear head, since it's hose is so short. So I bought 2' section of vac hose from NAPA and routed it forward, around the throttle body and then around and into the airbox. This extra length of hose seems to do the trick, almost in the same fashion as my filter in a filter idea. I have not had any oil inside my airbox since doing this and about 600 miles.
|Posted on Tuesday, January 06, 2009 - 12:14 pm: ||
I borrowed an old stock crankcase ventilation system idea from the early model Corvairs..just a simple road draft tube that empties the gases etc under the vehicle. Seems to have improved the idle quality on the bike. Maybe the moisture, other gases were mucking with things-dunno?
|Posted on Sunday, November 01, 2009 - 02:41 pm: ||
PCV valves are not routed to intake boxes for the vacuum obtained there, they are routed to intake boxes to recycle the fouled air for emissions purposes. If not for blow-by and the resultant emissions controls we would not have PCV valves.