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  #61  
Old 11th July 2019
shanneba shanneba is offline
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This may be of some interest in this discussion.

"How Today's F1 Engines Can Burn Oil to Make More Power"

"Fenske explains (hah!) two strategies F1 teams can use to manage oil burn, and both involve regulating crankcase pressure.
One method involves regulating crankcase pressure using system scavenger pumps of their dry-sump lubrication systems, which allows oil around the piston and into the chamber.
The other involves an ECU-controlled solenoid that lets crankcase pressure escape into the engine's intake system."


Wish the video was still available
https://www.roadandtrack.com/motorsp...ke-more-power/
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  #62  
Old 11th July 2019
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Did the plug cap mod myself, a nice cheap and cheerful kind of thing.

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  #63  
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Quote:
Originally Posted by shanneba View Post
This may be of some interest in this discussion.
That's interesting...but weird at the same time.
Oil burns slower than gas.
Plus the gunk it makes when it's burnt.
Seems counterproductive??

Quote:
Originally Posted by harley506d View Post
Did the plug cap mod myself, a nice cheap and cheerful kind of thing.
That's pretty clean.
I assume stock air cleaner goes over the lines OK?
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  #64  
Old 11th July 2019
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Whatever it takes I guess.
Well, that ties in to what's good for racing ain't always for a street engine.
What type oil?...... Nope forget it, ain't going down that road again.....

The article says that some crankcase pressure is sometimes used to basically a add into the chambers.
That seems like another nightmare in controlling the bottom end.

They must measure the oil level periodically?
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  #65  
Old 12th July 2019
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It'd make me want to wear painters pants to have a place to stash a couple quarts.

bustert,
I've been over my annoying intrusions in the latest wetsumping and breather threads and I have no clue what you mean.
I'll wait and hope you can remind me what I wished I remembered.

Meanwhile, I'm going through the Ultimate Crankcase Breather thread again.
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  #66  
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I would bet that bustert meant the designers were trying to keep more "Oil mist" inside the engine to keep everything well lubed, when they designed the breather holes smaller. Does it increase c/c pressure?, only if the hole is too small or too long, or both.
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  #67  
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Well the air pressure will increase with the smaller holes.

Just like partially covering a water hose with your finger.
The flow doesn't change but it comes out of the hole faster due to the new restriction.
Of course, it backs up in the hose first then the stream reaches farther out with more force.
So there is something to the smaller hole.
bustert is kind of like Yoda sometimes.
I don't understand a word then all of a sudden, oh yeah, now I get it.
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Yeah, but I'd compare oil to water, and steam to oil mist, maybe like a pressure relief valve.
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  #69  
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I think that's the problem to begin with.
I understand water and oil better than steam.
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  #70  
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Quote:
Originally Posted by Tomcatt View Post
The advantage is not putting what's coming out of the breather into the intake. You want your carb or throttle body inhaling cool clean air not oil mist and combustion by-products from the crankcase.
I can vouch for that. I was in the "it can't be that bad" mindset. Just pulled the jugs off my 04 with 60k running the breathers into the carb (SE A/C) I don't know if I've ever seen so much crud in a combustion chamber. What a joke. Pulled apart several 70's-80's small block V8's look like a brand new motor compared to my bike top end.

(The rings were in OK condition, didn't assess the valve seals yet.)

Quote:
Originally Posted by Hippysmack View Post
The only thing the squirters did was add the same volume of oil in the sump at a faster rate.
Umm, what?

Basically I think the squirters have no ill effect, except during that time when the scavenging is getting behind, the additional oil volume exacerbates the problem.

Oil in suspension - should only increase with RPM (or does it?) - unless your crank is running in an oil bath, then all bets are off and you need to address the scavenging issue, before being concerned with breathers.

Quote:
Originally Posted by Hippysmack View Post
Well the air pressure will increase with the smaller holes.

Just like partially covering a water hose with your finger.
The flow doesn't change...
Any restriction does change flow. More restriction = less flow. More velocity = more flow. You can overcome restriction by having more pressure, then the velocity increases.

My theory on the smaller holes is that they're "just big enough" (or a little more than that) to let air out fast enough when pressure rises, but small enough that air trying to come back IN (as the check valve closes) is not any significant volume. If your blow-by is too much though, you'll have higher CC pressure.

For a while I ran a homemade round A/C with homemade banjo bolts etc. and all of it was waaay less restrictive than the tiny breather holes. Nary a drop of oil came from those breathers.
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