Posted by Janicholson on October 09, 2011 at 16:32:30 from (67.72.98.46):
In Reply to: Turbo- How posted by farmer boy on October 09, 2011 at 16:20:03:
A turbo is driven by either exhaust gasses, or by gears from the crankshaft. THe exhaust driven type (by far most common) increases speed due to increased flow of the volume and temperature of the exhaust gasses. The more speed, (or open throttle) the faster the turbo operates. a gear driven type (often used on WW2 piston engine airplanes) speeds up only when the engine RPM increases. The advantage of the gear drive is more instant power because it is operating independently of throttle setting, and may be up to speed already. THe advantage of the exhaust driven setup is using waste heat and energy to cram more fuel and air into the engine. Both can reduce a standard engine to molten globs in a few seconds if not controlled by pressure limitatio (waste gates). low compression design of the Turboed engine can allow it to be crammed even more full of combustable mix due to the larger combustion chamber. Best practices require: Heavier main and block design, stronger bearings, forged cranks, high alloy rods, forged pistons, Oring head sealing systems, and far better cooling. Jim
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