Oil coolers, filters, full flow and oil temperatures

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Oil coolers, filters, full flow and oil temperatures

Postby Larry Jowdy » Sun Jan 28, 2007 10:02 am

VW engines rely on air and cool oil to keep the internal operating temperatures in check. Air blowing over the fins of the cylinders helps to keep the cylinders cool and, the oil passing through the engine helps to keep the moving parts cool.

Many high performance VW engines, especially those with turbochargers have had the case modified to include piston squirters.

These small holes in the oil galley are aimed at the backside of the pistons to help keep them cool. This is not limited to turbo applications and really helps with internal oil temperatures within the engine.

Having an additional oil cooler is an advantage especially for warm or hot climates. Having a a thermostatically controlled valve that bypasses the auxillary cooler can be of a benefit during warm up or if the weather is cold. (best oil temperatures are in the 160 to 200 degree range)

Cold oil robs power and doesn't flow as well as warm oil. If the oil get too hot, (usually around 260 degree's) oil pressure drops and the effectiveness of the oil also diminishes drastically. That's why an auxillary oil cooler is beneficial.

Unless your engine case has been machined for full flow, adding the filter helps but doesn't work the same as an engine case that has been modified. Basically, the main oil galley is drilled and tapped for pipe thread. This galley is located just above the oil pump on the passenger side. The oil pump is modified in that the internal high pressure port is plugged to keep oil from passing from the oil pump to the main galley. The cover of the oil pump has a pipe thread fitting. The way it works is the oil pump pulls oil from the sump via the pick up tube into the oil pump chamber. Since the high pressure side of the pump is plugged, it forces the oil out via the oil pump cover. Most people run that line to an oil filter. From the filter, oil can pass through an auxillary oil cooler then into the main oil galley via the machined and threaded hole.
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