iiyama
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| posted on 9/9/06 at 01:39 PM |
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Crankcase breather
This is probably a dumb question, but here goes!
What does this do? Yes, ok, I understand it lets the crankcase breath, but why does it need to do this? what if you remove it so there is no breather?
Why do some engines have a line that goes to a filter as a breather?
As standard the Busa breather goes back to the airbox, I guess you could route this to a catch tank if required?
Lots of questions, but interested to know the answers!
Ian
[Edited on 9/9/06 by iiyama]
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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DIY Si
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| posted on 9/9/06 at 01:57 PM |
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The crank case needs to breathe for several reasons, two of which are that there will always be a certain amount of blow by which will pressurise the
crank case, also the engine will genarlly pressurise due to getting hot. The breather(s) let this excess pressure out, if it weren't there the
engine would just blow its oil seals and leak.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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iiyama
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| posted on 9/9/06 at 02:06 PM |
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OK, that makes sense!
So how come you dont need to have a breather with a dry sump then? Breather is in the sump tank?
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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DIY Si
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| posted on 9/9/06 at 02:37 PM |
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Pretty much. Since the pump sucks all the oil out the air then just gets sucked out into the tank. I think.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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iiyama
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| posted on 9/9/06 at 02:40 PM |
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OK, thats a load off!!
Cheers!
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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ChrisGamlin
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| posted on 9/9/06 at 03:56 PM |
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Yep, a good dry sump is designed to purposely create a vacuum in the crankcase, so obviously you don't want a breather in situ because it then
wont be a vacuum!
The reason you want the dry sump pump to pull a vacuum is because if there's no air in the crankcase, then the pistons coming up and down
don't have to constantly move this air around the crankcase, so can give you a bit more power.
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iiyama
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| posted on 9/9/06 at 04:30 PM |
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ah hah!
Suddenly it all becomes clearer!
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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