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  #221  
Old 18th July 2013
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maru.....Yeah I was thinking of putting a venturi into the exhaust to "pull" the blowby out.
I chickened out because I didn't want unintended consequences. Like maybe oily baffles wrap.
Buell don't vent into the combustion chamber though do they? I don't like that idea at all.
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  #222  
Old 18th July 2013
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Quote:
Originally Posted by maru View Post
And exactly why is this mod the ultimate? Because someone says so and many others just accepted that fact?

Why didn't Buell copy this setup on the XB's? They would not have even had to have considered crankcase venting when they developed the relatively high rpm XB's, since this setup is the ultimate. Any other arrangement they came up with that was not the ultimate would clearly be inferior. Is this what they mean by planned obsolescence?

The Buell XB is a step ahead of an XL in terms of oil containment and crankcase breathing in my opinion. While I doubt even that is the ultimate, I double doubt that something is the ultimate just because somebody posted a thread claiming it to be the ultimate years ago and nobody has challenged that reasoning.
Steve, I didn't take the term "ultimate" literally either. Perhaps, "alternate" would have worked better. ? I wouldn't second guess the engineers at HD or Buell either. I do know the later Sportster oil pumps have a larger scavenging section like the Buell pumps and that the Buell head breathers are just glorified Sportster head breathers and are easier to replace because they are external.

Who knows how much crank case pressure is built up at higher sustained RPMs?

The main reason I keep returning to this mod is basically out of necessity, I've broke two Buell carburetor mounts and one Drag Specialty mount. Maybe it's the weight of my air breather... ? My motor seems to run fine, vent fine and it's never wet sumped.

Another thing I've noticed is the holes in the after market head breather bolts measure around .200" verses the tiny .070" holes in the stock head breather bolts. Why is that?


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Last edited by ~Grind~; 18th July 2013 at 05:50..
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  #223  
Old 18th July 2013
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OK
As I understand it and if you look at the oiling system the downstoke of the piston causes pressure in the crankcase to force oil into the cam chest where the scavenge pump can pick it up and return to the tank.
Understand Im about a 12 er into this now
I may feel different Thursday !
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  #224  
Old 18th July 2013
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Quote:
Originally Posted by maru View Post
Agreed! I guess my problem is with the choice of words and the assumption that it means what it alleges.

While I have no clue what the ultimate setup is I have been exposed to arrangements that at least in some regards are better. Sky's drag bike pulls from the camchest as well, but it does not vent directly to atmosphere. It has a powerful electric pump to assist in reducing crankcase pressure. Not so much to solve oil leaks but to reduce pumping losses.

Another way to reduce internal pumping losses are to connect the crankcase to the exhaust and use exhaust vacuum. Both systems reduce pressure enough to allow the use of less ring tension which also reduces frictional losses.

Both systems have the potential to provide a free lunch in terms of power, but both systems have potential to cause all kinds of problems if they are not properly sorted out.

One needs to take into consideration the intended use when considering progress. Neither of my Buell's have such a system even though both would make more power with either.
I've read somewhere on this forum from a very reliable source that did some extensive testing on crank case ventilation and concluded that there wasn't much power left on the table to be had by modifying the system for horsepower gains. I wonder if Sky did any Dyno testing with his set up. ? Of course, like you said, one does have to consider the intended use.... Every little bit helps.


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  #225  
Old 18th July 2013
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Here is some food for thought (be sure to read the part about the vacuum pump)... and some more (Google search the Bunnbreather for more info).

Personally I've tried a few different "crank case breather" configurations on my bike.

I've tried venting the head breathers to atmosphere using the stock head breather valves. Worked fine. Basically the same as the Deimus mod with a Krankvent.

I've tried the Deimus mod without the the Krankvent. Lets lots of moisture into the engine. Just pumps air in and out of the motor. IMHO, not good.

I've tried my version of the Bunnn venting system by letting the air escape through the head breathers and in through cam chest with the Krankvent turned around. Again, this let lots of moisture into the motor. Not good IMHO.

IMHO, I think it best to make sure the crank case vents without letting any outside air into the motor.

Last edited by ~Grind~; 18th July 2013 at 09:31..
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  #226  
Old 16th September 2013
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I've had my eye on this mod for a couple years now, basicly ever since i did the 1250 conversion. As like everyone else was getting more pressure / oil coming out of my breather arrangement than prior to build. Not a big deal except that no matter where i put my hose, or what i put on it (filter, nothing, catch can) i couldn't keep the crankcase / oil mix off my rear tire. I changed umbrella valves twice. Put nice counter sinks in the valve seats to get them lower. Rebuilt engine with new rings. Nothing worked, everything always had the same result. So over the weekend i finally did this mod. My first observation was the pressure coming out of my breather hose was half of what it was prior. Seems to be more consistent to friend's stock breather pressure. I rode the piss out of it last night (110 mph, hard accels, traffic) and it seemed to work better. Time will tell but this is the first time i'm optomistic that my breather gas / liquid will be manageable and not be in my mind when i'm riding.
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  #227  
Old 17th September 2013
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Just like thinktank I wanted this upgrade ever since my 1250 conversion. There were really two problems
1) blow-by. even though I have SE heavy breather installed that is supposed to catch all the oil and redirect back to intake there was still some leaking thru the plugs and leaving mess behind.
2) wet sump was pretty evident, especially on hot engine when oil temp was raising above 170F. though i did not really hold my breath to solve this problem entirely with this mod.

And yet, riding with this mod for a week I have pleasure to report that wet sump issue had almost disappeared. It woks better than I expected. Yes, the ugly hose sticking out the cam cover does not exactly please the eyes, but the bike performs much better now and it's a huge win. Oh, and naturally blow-by is no more.

I snapped some pictures where you can see that I mounted a catch can under the frame. After witnessing how much oil collects inside the SE heavy breather I did not dare to leave the hose dripping on the road. Some of that oil would have gotten on my rear wheel and that was my biggest fear. As you can see I did not install air filter on the catch can, I reckoned it was not necessary since krankvent only breathes out, never in. So, there is very slim chance of any dirt getting inside.







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  #228  
Old 30th December 2013
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Building an Oil in Frame sportster and thinking about doing this mode and just ditching the oil tank vent tube all together.
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  #229  
Old 30th December 2013
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I have pictures of my setup here. Do you guys see any reason this wouldnt work? Long time watcher first time poster. Dont bash me too hard just looking for some guidance.


http://www.chopcult.com/forum/showthread.php?t=34789
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  #230  
Old 30th December 2013
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I don't have an answer for you but you might try clear oil lines to confirm it's doing what it needs to.
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