Baffles in the sump

[KERMIT1200]

Hi all,
On the 'Crank Balance Factor' thread the question of baffles has appeared - I thought I'd start a new thread.

This what I know

There in place to stop the oil in the sump surging up over the crank,therefore eliminating any form of drag on the crank.They also retain oil in the sump,making sure oil pump pick up isn't starved of oil.On high reving motors stop the crank airing the oil - air isn't a good lubricator!

Therefore they were fitted to 120 because they rev higher,spin up quicker?

Andy

 

[jotacorsa]

there are baffles in the 750s

they do not eliminate the presence of oil in the air volume of the crankcase
the crankshaft it is always slinging oil through an oil laden vapor as it spins
droplets hitting the baffles tend to not fly back up whole into the spinning mass

cheers,
scott

 

[CLEMTOG]

they keep the oil, which is a wet sump (so a reservoir) from being "in the wind" also retains the pick up under a puddle (so it can pick up oil not air) when under heavy braking or acceleration, which you dont get on 120's
CLEM

 

[sfcpiet]

Oil level in the sump is a good deal below the spinning crank, the baffles will prevent oil being splashed over the crank when it surges forward under heavy braking.  Don't think it is primarily meant to keep oil from the crank per-se, but to prevent the crank flinging it up the cylinders and over-oiling the pistons on over-run.... lot's of fuel in the combustion chamber at this point, no use making it worse through oil being forced past the pistons and further fouling the plugs.

piet

 

[Spider Wales]

Many moons ago I had a Honda twin that had split the crankcase baffle, that used to burn oil like a bitch! I cured it by replacing said baffle.
This was under acceleration/braking, I guess it's there to help keep the oil not doing is alloted task at present, (ie, lubricating stuff) in the reservoir/sump, not splashing around the bores and giving the oil control rings more of a task than they are designed to do.