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  #91  
Old 15th January 2022
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That's what a lot of people do as I have read.
Obviously, it's not my preference. And I don't have to do that to keep oil off my filter.
Same as always though, more ways to skin a cat.
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  #92  
Old 15th January 2022
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Quote:
Originally Posted by Steve9 View Post
Mick,

So Buell uses car-type pcv valves. That would be to vent the gases after the umbrellas, or no umbrellas?
No umbrellas. No mess.
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  #93  
Old 15th January 2022
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In the link I gave earlier, you'll see that XLF member, TPEHAK, dissected one.
It does have an umbrella.

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  #94  
Old 15th January 2022
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Didn't we discuss reed valves last year? like a two-stroke intake might have

Wait...that's the krankvent. Expensive reed valve
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  #95  
Old 15th January 2022
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The original Krankvent did have a reed.
They went out of business and the Hayden Krankvent turned into an umbrella in a cannister.
http://www.sportsterpedia.com/doku.p...yden_krankvent
It's kind of funny.
So many people try to run from umbrella valves and the industry supporting HDs keeps running to them.


Last edited by Hippysmack; 15th January 2022 at 06:25..
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  #96  
Old 15th January 2022
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your machine your dollar
less lubrication
less cooling
dirtier engine
yes, there is changes with heat. newer truly syn oils are diff animals. there is less of a change due to molecular engineering. there are still compared to old standards, same as tire because people are sooooo used to the older spec's.
if i did not have a guitar on the bench, i could find the info but i would not be making money.
the theory is that when cold, the chain stays long so it flows freely but as heat is added, the chain curls up which reduces flow rate and the oil become more tenacious. take a box, put a hole in it and put diff size marbles in it and roll it around, the marbles will jam up at the hole. now put same size marbles and they flow out the hole better.
most all syn on the OTC are not syn at all but legally a mfg can claim it to be if it is significantly diff than base stock. most are petroleum based. some bases are made from natural gas and it is cleaner than petroleum base and since it is significantly diff, classed as a syn but it is petroleum based!
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  #97  
Old 9th February 2022
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had some oil in the a/filter after hard riding / a bud with a similar 883r "03 tried the lower oil level thing and says it works / I am trying it / so far I think it's better but not sure yet need bigger sample size yet
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Old 9th February 2022
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now that I'm thinking about this - how does the oil in the tank end up in the air cleaner - if the vents come to the carb from the crankcase up through the cylinders and heads ?

just sayin
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  #99  
Old 9th February 2022
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ok - I had this backwards / the air comes up the pushrods and goes out the umbrellas to the air cleaner ! never mind / ( my ironhead has a foo foo valve that foo foo's on the driveway and the garage floor and everywhere else , total loss ? ) but I still am not grasping how my evo 883r oil tank level translates to more oil in the air cleaner / I've heard reasons before but can't remember any of them so they may not have been too good
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  #100  
Old 9th February 2022
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Short answer, lowering the oil in the tank simply allows more air to buffer in the tank.
Plus a longer air/oil separation time.
It's not the tank that sends oil out the breathers.
It's the condition of the air and oil (balance as I call it) in the crankcase.
Oil pump sends oil and air to the tank which is then separated at the tank.
The air goes back to the cam chest and oil drops off into the tank.
Same air in as in out of the tank as long as the pump keeps up.

edit:
If the air/oil mix in the tank doesn't separate fast enough, more oil is carried with the air back to the cam chest.
So doing the math, lowering the oil level gives more room for air.
Personally, I'd rather that room besmirched with oil to the top mark of the stick.
If'n afterwards, you are getting too much oil in the A/C, replace the umbrellas, do a compression test, or otherwise see why the air/oil mix in the crankcase is mucking up the separation in the oil tank.

The biggest problem is with rubbermounts with the plastic oil tanks.
The vent is really close to the return and it's restricted into a small cup in the upper lid of the tank on the inside.
I think the point was to not allow oil enough room to go up into the vent and back out to the cam chest.
But the design ended up slowing the oil on the left side from getting to the deeper trough in the right side.
So that is the only years (04-up) with factory tanks that really have a case for lowering the oil level in the tank.

Oil mist out the breathers at high speed happens to all of us.
Ring seal at high rpm, higher rpm delivers more oil from the pump...
The air/oil mist balance may get out of whack somewhat and more oil is brought up into suspension.
That denser air hits the umbrellas carrying more oil than at lower speeds.
That also brings more oil mist on top of the umbrellas.
There is a small drain chamber in the rocker boxes where a tiny hole allows oil to drain back into the rocker boxes.
(collected and pooled separated oil that gets past the umbrellas)
If there isn't enough vacuum coming from the inside, that left over pooled oil gets sent out the breather bolts.
Higher RPM turns the "slight vacuum" inside the motor to positive air pressure.
After 5000 or so, you no longer have a slight vacuum.
The longer you sustain high RPM, the more oil mist will get out the breathers.
It's just the way it is.

Millions of dollars from HD to aftermarkets have tried to stop that and haven't been able to.....

edit:
To go a step further, XRs live in the pure positive pressure zone.
And they don't use one way valves but rather baffle tubes.
So there is a point in the higher RPM range where you will not have the provisions to stop oil carryover.

Last edited by Hippysmack; 9th February 2022 at 09:06..
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