What is windage tray (crank scraper)?

[smhheidari]

Hi guys, sorry for this noobish question!

plz tell me whats that?

[williamggruff]

When the crankshaft rotates, it sprays oil around the crank case. The oil that sprays up on the inner walls of the block reduces the volume of oil sitting in the bottom of the oil pan, thus reducing the volume of oil available to the oil pump. Also, if you look at the way your engine sits at an angle in the engine bay, you can imagine that taking a hard left turn will leave the oil pump with nothing to pump. A windage tray/crank scraper reduces the amount of excess oil that flies around the inner portion of the block when the crank rotates, and acts as a barrier to keep the oil from riding up the side of the block, thereby increasing the amount of oil available to the oil pump. It also reduces the amount of oil that rides around on the crankshaft, which frees up some power.

[c.d.iesel]

keeps the oil located around the oil

pump pickup

keeps the oil from climbing up the side of

the crankcase wall when the car is doing wheelies,

or prolonged high speeds - like the banking

at MONZA, DAYTONA, or during long high G turns

which might cause momentary oil starvation

keeps the oil from being bashed, and foamed

by the swings of the crankshaft journals -

which also causes some loss of power

keeps the oil located around the oil pump during extreme

braking, and during acceleration.

a nice one for ALFA

[smhheidari]

can i use it with baffled oil pan?

[Harv]

Yes

John

[aa/fd]

Here is a segment from a tech article in Circle Track Magazine. It pretty well explains the two and their functions.

"New racers often confuse scrapers and windage trays, but they perform quite different functions. At high rpm, oil tends to "rope" or wind around a crankshaft, causing power losses. A scraper is a precisely shaped piece of sheet metal that normally attaches at the pan rail and uses narrow slots that allow the crank's counterweights to spin past without contacting the scraper. The scraper catches oil off the crank and allows it to drain into the bottom of the pan. A windage tray normally separates the crank from the pan sump almost completely. It allows what drains into the pan to access the sump (either through shaped louvers or a screen), but makes it difficult for that oil, once it is in the sump, to splash back onto the crank."