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Friday, 12. August 2011

Pumped Up 7

Supply and Demand
Look inside of a stock or high-performance pan and you'll see baffles there to keep the oil pickup submerged during cornering, accelerating, or stopping. For high-performance pans, the baffling is typically far more elaborate and designed to better withstand the forces of extreme-duty operation. Critical to a good oil pan's design is also how well it allows gravity drain-back into the sump.
By Bob Mehlhoff

by mcschool @ 17:02h | link | 0 comments | comment

Thursday, 11. August 2011

Pumped Up 6

But before you install a new oil pump onto the engine, it's always a good idea to double-check the end clearance of the pump gears beforehand. For most small- and big-block Chevys, the pump gear's end clearance should be very close to 0.0025-inch, but it's always best to first check with the pump manufacturer for the spec. To check this dimension, disassemble the pump and de-burr both gears with a small file. Then, reinstall both gears and measure the endplay (from the top of the gears to the top of the pump housing) using a depth micrometer or a feeler gauge. If you install a pump with a measurement that exceeds the 0.0025-inch spec, then the pump will not prime as easily and/or perform as well. If the endplay is greater than this, it can be corrected by sanding the pump body with a piece of solvent-wet 220 wet/dry sandpaper placed on a hard and very flat surface, such as a thick piece of glass. To correct clearance that measures too small, sand the gears on the top end in the same manner as the pump body. In either case, remember to wash everything in solvent and then blow-dry it (rags will leave lint) before reassembly.
By Bob Mehlhoff

by mcschool @ 10:39h | link | 0 comments | comment

Wednesday, 10. August 2011

Pumped Up 5

Most aftermarket pumps come with a new pickup installed and brazed into position. If yours does not, you should braze the pickup into the pump body, positioned about 1/4-inch (0.250-inch) above the bottom of the pan. Before brazing it to the pump cover, remove the pin, spring, and relief piston from the cover so that the heat won't damage them. Put the pump securely in a soft-jawed vise and tap the pickup into the oil pump with a homemade tool or one from a specialty tool company. To measure the pickup-to- pan clearance, place a small piece of clay between the pickup and bottom of the pan and install the oil pan gasket in a mock-up (without adding sealant).
By Bob Mehlhoff

by mcschool @ 14:01h | link | 0 comments | comment


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