• Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

Crankcase breather venting?

BiG DoM

BiG DoM

Husqvarna
AA Class
Got to wondering about the 610 blow-by venting (may be same on the 630) ... from the head there is a large hose straight to the tubular frame above ... then a thin breather to the airbox. Low down on the centre main tubular frame there is another small pipe vent from engine again into the frame. Now what happens to any blow-by condensate oil ... does it just build up in the sealed frame to go where? Is there very little on these engines? Who knows? I could drill a small hole right at the bottom and see what comes out I guess :rolleyes:
 
The breather hose you're speaking of collects the vaporized oil from the head and gearbox and sends it to the airbox so it can be sucked into the combustion chamber and the hydrocarbons contained within the mixture (that are pretty toxic) can be burnt. Basically it's emissions related stuff, but I wouldn't let it puff freely. Racers use external containers, and I believe the new Euro 4 emissions standards require a separated container.
The 610s don't have a whole lot of vapors, I personally don't think it's worth the trouble to remove it and I believe oil doesn't condensate in the frame but in the airbox
 
I just replaced my piston rings and i seem to be getting alot of vapor coming out of the breather hose if disconnected. Ive only taken it on 4 15 minute break in runs so far. There was also a small amount of oil on the intake valves already. I'm really hoping the rings seated right and that's not why the vapor is coming out. Any input?
 
Mmh the vapors can seem a lot but the major difference I noticed when my rings were shot was a that a lot of oil condensed into the airbox in a very short time (50 or so kms) and eventually dripped down from the lower airbox intake, so basically check how much oil is there. A little bit of oil is normal (like a few ccs). To be 100% sure you could take the bike to a shop and get your exhaust gasses measured, a high concentration of HC (Hydrocarbons) indicates you are burining oil.
 
the so-called blow by is noticeable at low engine speeds but must be attenuated almost until it disappears when the number of engine revolutions increases. in this video we see the blow by of a pegaso 650 with an engine in very good condition. give it a try

View: https://youtu.be/jqw_mtBkms8
 
4T pressure and suction waves inside the crankcase each time that piston goes up and down. Best to be in a neutral state with good crankcase breathing. sorting the vapor is the other issue with most machines closed circuit into the airbox or intake path. Some like the x lite machines did go into the backbone and could be recovered when it condensed through hose setups. I remember my old 610 had a plastic breather box up high in the frame that would allow condensate to flow back into the engine.
 
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