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[QUOTE="WoodsRider, post: 160603, member: 16545"] A turbocharger rotates 8 to 12 times greater than engine RPM. A typical Roots or Paxton supercharger rotates 2 to 3 times greater than engine RPM. The turbo is also exposed to exhaust temperatures as well as compressing air and operates at higher temperature than a blower. The oil lubricates and carries heat away from the bearings. When the typical turbocharged engine is shut down oil no longer flows through the bearings. The oil that remains is literally "cooked" to the bearings. In the application we were running, a VW "pancake" 4 cylinder engine, we'd shut down the engine at the end of the run. After five or six hard runs the bearing would sieze and the turbo wouldn't work. Sometimes this happened in the middle of a run. :eek: The solution would have been to run a "soak back" pump that continued to feed oil to the turbo bearings after engine shut down. Instead we yanked off the turbo and dropped back into the "naturally aspirated" classes. Had forged pistons and 12 degrees initial advance... but 35 degrees total advance. Still ran in the mid-12's with three "bad" pistons though. :confused: [/QUOTE]
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