Oil Pump
The stock 2.4L oil pump has been deemed inadequate for many high performance applications. Above 5800 RPM's, the stock oil pump does not deliver well. Thus, many have chosen to modify the oil pump in hope of a better oil feed.

Contents

1 Quad 4
2 JBP High Pressure
Quad 4
Many GM enthusiasts with the LD9 have opted for this swap. On GM's engine dyno, the LD9 starts losing oil pressure with the stock pump above 5800 rpm, as the smaller 2.4L oil pump spins too fast and cavitates (aerates, foams) the oil and cause air to flow with the oil. This oil pump has been shown to perform over the 5800 rpm mark.

Great for boosted or any higher output applications. With this swap, nearly 15 pounds of weight is removed off the crankshaft, resulting in less rotational mass (more usable horsepower). With the full modifications needed the oil pan can then accept 5.5 liters instead of 4.4 which in turn decreases oil duty cycle. The oil pump sits almost 1" lower than stock.

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For a How-To visit the link which provide written instructions and detailed pictures:
http://www.j-body.org/forums/read.php?f=2&i=414927&t=382822&p=1
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How-To: Quad 4 Oil Pump Swap


JBP High Pressure
As the RPM of the engine increases more oil is required. Our oil pump is able to flow the volume of oil required to maintain the pressure desired. A relief spring within the pump relieves the pressure when it reaches the desired level. Our High pressure pumps have a higher pressure relief spring as also do most high volume pumps. The benefits of our oil pump is for those turning high RPM, and need the extra oiling capacities of a high pressure pump. Always make sure oil levels are adequate before racing. Made for the J-Body Z24 yet fits the Alero as well:
http://www.jbodyperformance.com/new/PartDetails.php?partId=686&catId=686&catName=JP0686
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