Jeep Engines - Oljeep

360 AMC V-8 (OILING SYSTEM) 409TestingFor DecelQuantity5Figure 7 - 31DRY SUMP OILING SYSTEMFor drag racing, a dry sump system should only beconsidered for vehicles that have almost no groundclearance. Dry sump oiling systems can be veryadvantageous in an oval track vehicle. Dry sumps providemore ground clearance so the vehicle can sit lower. This isbecause dry sump pans are very shallow. This allows thecenterline of the crankshaft to get closer to the ground whilemaintaining the same actual ground clearance. (Groundclearance is usually specified and enforced by thesanctioning body.)All production (stock) oil pans are wet sump designs. Witha dry sump, the oil that is being stored in preparation forbeing pumped back into the engine is stored outside theengine (or remotely), usually in a separate tank (withbaffles, etc.) located ahead of the engine. A race wet sumppan would have a large capacity rear sump located directlyunder the crankshaft.Production wet sumps are small and may be located in thecenter, front or rear. A race wet sump ideally designedwould be 9 to 10 inches deep. But many professionally-builtrace vehicles are built so low to the ground that there is noroom for this style pan. Enter the dry sump. However, aproperly designed dry sump system is expensive. Therefore,a racer who doesn't have his crankshaft dragging on theground doesn't need a dry sump because it's money spentfor no gain. Here, look closely at a race wet sump. There isperformance in a good wet sump system race pan.A dry sump oil system should be used whenever a deep oilpan cannot be used. There is approximately 40 hp lost to ashallow, wet sump pan.The dry sump system consists of an oil tank, scavengepump, and a pressure pump. The oil pump used is a multistage,external assembly with 2 or 3 stages for scavenge anda pressure stage. Drag race engines require 2 scavengestages, oval track engines require 3. The pump should berun at .5 to .6 engine speed. The drag racing pump has two1.45" wide scavenge stages and a 1.2" or 1.45" pressurestage; the oval track pump uses three 1.45" scavenge stagesand a 1.45" pressure stage.Figure 7-32, Figure 7-33, and Figure 7-34 show three viewsof a dry sump oil pan. Figure 7-32 shows that the sump isoffset to the right side. Figure 7-33 shows the locations ofthe dual pick-ups. Figure 7-34 shows the windage tray(baffle) inside the pan and how it had to be slightlymodified (dented) for installation of the dual pick-ups.Note: After removing the stock oil pump, remember toblock off the oil passage.The oil pans for drag racing and oval track racing aredifferent, mainly in pick-up location and baffles. (See Figure7-35.) The tank for drag racing use can be as small as 5 qts.,while an oval track racing tank should be 3 gallons.Now that we know all the parts, let's see how it works. Thepressure stage picks oil up from the tank, then sends it to anexternal oil filter, and then to the engine. The engine then getsoiled and dumps the oil back in the pan where the scavengestages pick up the oil and return it to the tank. The tank isvented to the valve cover to equalize pressures. ContactWeaver Brothers for further details and dry sump hardware.Weaver Brothers1980 Boeing WayCarson City, NV 89706If you're doing a lot of development on the engine, then acast pan is more durable than a stamped pan, unless a stockpan is being used; that is, an unmodified one-piecestamping. But that's not likely with a dry sump.In developing our cast pan we found there are some verysimple basics that you can't violate. Once the pan, tank andpump (we used a 4-stage Weaver Bros. - 3 scavenge and 1pressure) are selected, everyone feels everything is handled.This can easily be a 20 to 30 horsepower error. If you checkthe drawing for the oil lines in Figure 7-35, it shows #I 2 lineT --TIrl