Sump pan

WW sells a deep sump pan for the Corvair engine. He posted the following (with slight edits) on the CorvairListServe.

Gasket Sealing

One of the advantages of the deep sump pan is that the gasket is no longer at the bottom of the sump. With a stock oil pan, a serious leak has the capability of draining the entire sump. A deep sump pan will retain some of the oil, even in the highly unlikely event of a PanGasket failure. Still, you must exercise extreme care in installing the correct gasket. Although Corvairs were notorious for leaking oil, two of the biggest reasons they leaked oil at the oil pan gasket were the fact that the stock oil pan was a skid plate on the bottom of the car, and that its steel construction had a different rate of expansion than the aluminum block, putting shearing forces on the gasket. Neither of these issues applies to the aluminum flight pan.

In the past, aviation sealers with the names Fuel Lube and Tight Seal have been recommended, but both these products can be broken down by additives in automotive oils. Because of this, we have reverted to using Ultra Gray Silicone RTV by Permatex. It is sold at most auto parts stores. Use craftsmanship in applying it to both sides of the gasket. Do not put on so much that it will ooze into the pan when the hardware is tightened. The pan rails have been clearanced for the motor mount bushings. After the pan is in place and the fasteners have been torqued, the protruding gasket in this area can be trimmed away with a razor blade.

External links:

Permatex Ultra Grey Silicone RTV

WW's Deep sump pan

-- NormanSmit - 13 Jun 2010