Bearing seal

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BelgiqueBasterd

Joined
Oct 5, 2006
Messages
381
Location
Belgium
Why does the left main bearing have a bearing seal? The entire engine is in the same oil bath so what function does this seal have?
Same for the reed valve, all the mechanical parts use the same oil so why the reed valve?

Just wondering.
 
The reed valve is used to expel the oil from the crankshaft area by using the pressure created when the piston descends. This also the reason for the seal, if there was no seal the pressure would escape through the bearing instead of forcing the oil out through the reed valve.
 
if the main bearing seal wasn't there,the crank would be running in oil to the height of the sight glass,about 1/2 way on the crank i'm guessing about 40-50mm deep
take a look in my gallery page 8.
max oil level in the crankcase is about 8mm in depth,governed by the overflow to the reed valve.
..weed..
 
I read this & wanted to respond,the phone rang lost track of things looked back a
bit later & well nuff said!! Word to the craigy :D
 
popup said:
if the main bearing seal wasn't there,the crank would be running in oil to the height of the sight glass,about 1/2 way on the crank i'm guessing about 40-50mm deep
take a look in my gallery page 8.
max oil level in the crankcase is about 8mm in depth,governed by the overflow to the reed valve.
..weed..
Click to expand...

Stupid question probably, but why is that bad? Wouldn't the main bearings be lubricated a lot better then?
 
BelgiqueBasterd said:
popup said:
if the main bearing seal wasn't there,the crank would be running in oil to the height of the sight glass,about 1/2 way on the crank i'm guessing about 40-50mm deep
take a look in my gallery page 8.
max oil level in the crankcase is about 8mm in depth,governed by the overflow to the reed valve.
..weed..
Click to expand...

Stupid question probably, but why is that bad? Wouldn't the main bearings be lubricated a lot better then?
Click to expand...

That is bad because a crankshaft rotating in excess oil volume is a major power loss.

take a look ad any serious race engine and its either dry sumped (if rules permit) or at a minimum has a deep, baffled sump to avoid rotating the crank through the oil mass.

Husaberg accomplish this via a reed valve to keep the oilevel low in the crank case.

A bit suprising to see an 8mm bleed hole in the LHS cases though- must still generate enough crankcase pressure to push the oil out even with an 8mm hole
 
AUSBERG said:
BelgiqueBasterd said:
popup said:
if the main bearing seal wasn't there,the crank would be running in oil to the height of the sight glass,about 1/2 way on the crank i'm guessing about 40-50mm deep
take a look in my gallery page 8.
max oil level in the crankcase is about 8mm in depth,governed by the overflow to the reed valve.
..weed..
Click to expand...

Stupid question probably, but why is that bad? Wouldn't the main bearings be lubricated a lot better then?
Click to expand...

That is bad because a crankshaft rotating in excess oil volume is a major power loss.

take a look ad any serious race engine and its either dry sumped (if rules permit) or at a minimum has a deep, baffled sump to avoid rotating the crank through the oil mass.

Husaberg accomplish this via a reed valve to keep the oilevel low in the crank case.

A bit suprising to see an 8mm bleed hole in the LHS cases though- must still generate enough crankcase pressure to push the oil out even with an 8mm hole
Click to expand...

Thanks for the anwer but this leads to yet another question? How are the main bearings lubricated? If there is only a bottom of oil in the crank area, how are they lubricated?
 
Main bearings are lubricated by "splash". If you look at the oil circuit diagram, it shows pressure feed to the big end, with a bleed hole at the balancer bearing. There is also an oil jet spraying at the bottom of the piston.

Does the "wandering oil level" that some owners talk about result from oil seeping back into the crankcase past the reed valve?
 
Neil_E. said:
Main bearings are lubricated by "splash". If you look at the oil circuit diagram, it shows pressure feed to the big end, with a bleed hole at the balancer bearing. There is also an oil jet spraying at the bottom of the piston.

Does the "wandering oil level" that some owners talk about result from oil seeping back into the crankcase past the reed valve?
Click to expand...

Does the "wandering oil level" that some owners talk about result from oil seeping back into the crankcase past the reed valve?


Yes it does, in the case of my 00 and 04 bergs.

Joe
 

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