Joined: Jun 18, 2009 Posts: 7018 Location: Swansboro
Posted: Sat Aug 22, 2009 8:56 pm Post subject:
The Wet Sump
Wet sump systems can be modified to ensure a supply of oil to the pump. In the oil pan baffles direct oil
through gates in pickup boxes using those same vehicular forces to move the oil. Scrapers and windage
screens scour oil out of the crankcase, directing it into the sump. Block modifications help oil return to the sump
as quickly as possible. The internal pump can often cope with the increased demands of larger bearing
clearances, higher RPM, higher horsepower levels and additional oiling tasks. When those limits are reached
an external pump can be fitted to match engine requirements for greater volume and/or pressure
Joined: Jun 18, 2009 Posts: 7018 Location: Swansboro
Posted: Sat Aug 22, 2009 8:57 pm Post subject:
The Dry Sump
In a dry sump system oil is positively removed to a remote sump by scavenge pumps. This allows the
engine to be lowered to its absolute minimum installed height. The number of scavenge pumps is driven by the
efficiency needed to maintain tank oil level for the application. The size of the scavenge can be increased to
induce a crankcase vacuum. The pressure section can be tailored to any volume and/or pressure requirement.
These parts can be packaged anywhere on the engine where a drive can reach the pump.
Joined: Jun 18, 2009 Posts: 7018 Location: Swansboro
Posted: Sat Aug 22, 2009 8:59 pm Post subject:
WET SUMP vs DRY SUMP
Monday, 17 November 2008 18:57
There are two major divisions in engine oiling systems: wet and dry sump. "Sump" simply means the chamber in the bottom of any engine that collects lubricants for redistribution. In a piston engine the oil pan is the sump. A wet-sump system is the same used in passenger cars and mostly seen in the lower levels of racing. Wet sump means engine oil is collected and stored in the oil pan until it is recirculated by the oil pump back through the engine. In a dry-sump system oil is collected in the oil pan and immediately sucked, or "scavenged," to an external tank before being recirculated to the engine. Because the sump is not used to store oil, it is referred to as "dry."
A dry-sump system has several advantages over wet, but the main one is additional power. Because there is only a minimum of oil in the pan, windageoil clinging to or splashing against the rotating assemblies of the engineis greatly reduced. In addition to evacuating oil from the pan, the external oil pump creates a vacuum inside the pan and block that further increases horsepower by improving ring seal. Other advantages of a dry-sump system are increased oil capacity because of the external tank, the ability to easily add remote oil coolers, and because the pan doesnt store oil, it can be quite shallow to allow for lower engine placement.
A wet-sump system is simple, low cost, and light weight. That's why virtually every production engine in the world uses wet-sump lubrication. A dry-sump system is more complicated, more expensive, and heavier, but it offers continuous lubrication under all conditions and the promise of increased power through reduced windage.
When you consider cost and complexity, a wet-sump oil system is the logical choice for most Sportsman racers. The biggest mistake a Sportsman racer can make, however, is to try to duplicate the performance characteristics of a dry-sump using a wet-sump system. This can't be done without sacrificing reliability.
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