First lets discuss the difference between a wet sump oiling systems (as found in your car) and a dry sump oiling systems as found on most American air cooled v-twin motorcycles.
The wet sump has all the oil stored in the oil pan. When the engine is running the oil pump draws oil in from the oil pan, pressurizes it then pushes it through the oil filter and to the points of lubrication. The oil lubes and cools these points as it passes. The oil then falls back to the oil pan where the process starts again.
The dry sump engine has a separate oil tank where most of the oil is stored. The engine always has enough oil in it to lube and cool it, but we will get back to that. A dry sump engine has a two stage oil pump. When the engine is running the first stage of the oil pump draws oil in, from the oil tank, pressurizes it, pushes it through the oil filter and oil cooler (if applicable) then through the oil passages to the points of lubrication. The oil lubes and cools these points as it passes. The oil then falls to the sump (bottom of the engine). The second stage of the oil pump then draws this oil in and pushes it back to the oil tank where the process starts again. In the “evo big twin” style engines the oil filter and oil cooler are on the return side of the oiling system.
Now back to how much oil is in the engine. These engines use oil pumps that are referred to as positive displacement pumps. This means that it pumps the same amount of oil on every revolution it makes. The second stage of the oil pump is larger than the first so it can pump more oil to keep the sump “dry”. This being said it stands to reason that the amount of oil in the engine remains the same with in a few ounces at all RPM’s even 0
In my eight years of using the Scavenger the least amount of oil I have seen from a bike with no oil cooler is 22 ounces. Most bikes have 28 to 32 ounces and oil coolers just add to that. I know this from using a paint mixing bucket, with the ounces marked off, to catch the oil coming out of the scavenger exit hose.
The Scavenger works a little different depending on model and year but the principle is the same. All Scavengers reclaim the old oil from the engine before it can mix with the fresh oil.
At all times, while using the Scavenger, the engine has the proper supply of oil. The engine always has oil pressure and both stages of the oil pump never run dry.
Seeing is believing, so use the dropdown menu to see which Scavenger works and how it works on your bike.
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