Why on a buick, chevy,olds etc,engine,what is the function of the crankshaft oil baffle and what does it do th?

Take a coffee cup and fill it about two-thirds full. Now swing it around from side to side while keeping it level.

Stuff sloshes out, right? And if you swing it around hard enough, you can even get the liquid completely off the bottom of the cup. Now put a cap on top of the cup and swing it around again. Everything stays in, right?

Same deal with the baffle. It keeps most of the oil down inside the sump so the oil pickup always is covered by oil and the oil pump is always pumping oil through the engine. When cars weren't as powerful and roads were worse, vehicles never really got fast enough or turned violently enough to uncover the oil pickup, but times have changed. The baffle also keeps oil from sloshing up and hitting the crankshaft (though it can still happen, especially in an overfilled condition), which could cause oil frothing. That would be almost as bad, since the oil pump is no good at pumping foam.

There are companies who make not only baffles which the guys explained above but aftermarket crankshaft scrapers. Their job is to fit closely (not touching) against the crankshaft counterweights to deflect oil away from the spinning crankshaft to let it flow back into the baffled sump.

The above answer about returning oil to the sump & keeping the pick up coverd is correct . The other thing that it does is keep large amounts of oil from splashing the crank, that will rob horse power & increase fuel consumption

it keeps the oil from shifting around to fast in the pan. gas tanks in cars and in delivery tankers use this system. it helps keep the oil away from the crank where it would be whipped up and be sort of like whipped cream.in gas tanks it keeps gas in a bowl to not starve the motor . in tankers its to keep the liquid from all shifting to one side and cause a tip over

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