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OK, Officially, I appreciate the data as presented. I also appreciate the charted results. But we need more. More importantly, we need to be able to repeat it. My understanding is the balloon was capped and set into a graduated container of water to represent displacement thereof. There are variables to doing that. But the balloon test video does support the information in the chart, sort of. What we don't have is 3500,4000, 4500,5000 etc. That helps to determine at what degree of blowby at what RPM.... (on that engine). So I agree, it doesn't tell the whole picture. But that isn't what there criteria was. They had 4 parameters; idle, cruise, accel and decell. The redline figure does accentuate the fact that high RPM will produce higher CC pressure. |
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I know and I don't blame you. :) |
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Even more restriction. (now I have to re-label this picture) :doh.. done http://sportsterpedia.com/lib/exe/fe...hippysmack.jpg If the oil AND condensate caught up in the shelf couldn't drain, that would be one big splatter of emulsion. I was kinda holding out saying that waiting on your picture. :o Quote:
But the affects of upstroke and downstroke are more equalized the faster the engine runs. That is until that moment when the rings are banging back and forth against the top and bottom of the ringlands and positive pressure gets between the ring and ringland. This allows more blowby to escape into the crankcase. Thus pressure in the bottom goes up due to RPM. That RPM moment is exclusive to each individual engine conditions. |
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(BT breathers maybe are more open) |
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Edit: You *could* get oil out the breather, but first the oil would have to make it past the foam thingy without running back down. |
Overall, I like the stock breather design (but don't vent into air cleaner!) No oily mess or catch can to deal with. Cheap too.
If the oil drain hole were to clog, you could easily back-purge it with compressed air to flush the oil drain hole. No disassembly required. So if you have stock breathers and you get crap puking out, my first advice is to use an air hose (or even mouth pressure) and blow gently backwards through it. I'm tempted to just route the breathers out the back of the S/E air cleaner (I saw pics of that somewhere) and end it there. Easy mod, not visible, and no filter or other paraphernalia to deal with or see. (Could also be done with stock AC.) Drawbacks as 60Gunner has pointed out: it's in a hot environment, and it's difficult to service, compared to external. |
That link you gave me to Aaron's breather dyno test.
In his observations: I was surprised at how little air movement there was at the end of the hose. When a motor is started with nothing screwed into the timing plug, there's a massive inhalation and exhalation evident. But apparently, necking it down to a 3/8” hole and connecting 2 feet of hose adds a pretty significant restriction. Air flow was nowhere near what I expected. Unfortunately, getting a 7/16“ or 1/2” hose into that area would be problematic, space is tight. Plus, a fitting with the correct thread and a 7/16“ or 1/2” hole may not be available. Another surprise was just how easy it was to plug the hose with my finger, and how it felt when I did. The pressure was not great. I'll have to go back to the video but as I remember, you could see the balloon breath...just slightly. The balance I keep talking about. In that engine, the balance is pretty damn good. The balloon inhales and exhales very slightly. The balance of positive and negative is pretty even. It inhales a slight amount and apparently exhales about the same slight amount...pretty even balance. There is a small amount of blowby in that video. Air induced (brought into) the engine changes that balance whether from excess blowby or the breathers allowing it. That's when the balance is tilted and the balloon will get bigger. |
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The air inside the engine will flow into the inlet and out the tiny hole or vice versa. The stale condition in a vent line where oil and moisture are allowed to live together without drainage / separation is when the mayonnaise forms. But I suppose dirty oil with debris bigger than the hole could stop it up and cause problems. Quote:
http://sportsterpedia.com/doku.php/t...ref:engmech05b |
YES!
I like the cookie man one actually, with those filters you would never even get a drip. And it's away from the intake so as to not cause turbulence there. Funny how the MoCo included those bosses which just happen to fit perfectly with the angled hose thingys. |
I just have to ask.... seen it several times and still not sure what it means.... What MoCo stands for??
Found these: MoCo Montgomery County MoCo Modern & Contemporary (Arts) MoCo Mozilla Corporation (Mozilla Foundation) MoCo Motion Compensation MoCo Mondo Corretto (Italian: World Fair; photography resource) MoCo Monitoring Committee for Euro-Mediterranean Cooperation in RTD (EU) MoCo Modern Cornish (linguistics) I am thinking: Motorcycle Corporation? :doh |
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