Crankcase PCV

[wezx]

I’m guessing that Goldwings use some type of PCV valve to vent crankcase pressure...can’t seem to find any info on that? Does anyone know how GW’s are venting crankcase pressure?

I’m asking because the other side of my motorcycling life is V-Twins, and there is a long-time running debate about whether V-twin (Harley-style) motors should be vented through the heads and back into the intake? Or externally vented into a catch can? I’m of the opinion that hot oily air should not be in your intake, so I externally vent my chopper motor into a catch can. But it occurred to me that Goldwings run literally forever and they probably vent back into the intake. Different animals to be sure but if Goldwings are venting back to the carb and they run so well it does give me pause about the detriments of this system....?

[WingAdmin]

There's no actual PCV, but there is a vent, and yes, it vents up to the air box. Vapors get inhaled back into the engine. Any liquids or condensate that end up inside the air box drain down to a sump in the air box, and from there into a hose that goes down to the left side of the bike where it is capped. That hose needs to be uncapped and drained periodically.

[wezx]

Hey, thanks for that...I knew about those drain lines...wasn’t thinking! That system seems better than the Harley system because it appears that there is some separation of the oil, water and the air with the majority of what goes back into the carb being air and the oily watery crap going into that tube. Is that correct? If so, that’s a better mousetrap. I always externally vent my Harley-style V-twins because if you’re using the stock venting what goes into the carb is oily hot vapor with really no separation...lame.

[WingAdmin]

Hey, thanks for that...I knew about those drain lines...wasn’t thinking! That system seems better than the Harley system because it appears that there is some separation of the oil, water and the air with the majority of what goes back into the carb being air and the oily watery crap going into that tube. Is that correct? If so, that’s a better mousetrap. I always externally vent my Harley-style V-twins because if you’re using the stock venting what goes into the carb is oily hot vapor with really no separation...lame.

That's exactly how it works. What ends up in that tube is a nasty emulsion of oily/watery goo, all the condensate that you didn't want going into your engine.