Ring gears are used because you can get a much better multiplication of force. The starter pinion gear can be very tiny while the ring gear is very large. Reductions of 12:1 or more are easy. With a pulley you can only go so small on the motor, and only so large on the crankshaft, limiting you to 4:1 or 5:1.
Ring gear starters aren't used as generators because when the engine is running, that gear reduction turns into a gear multiplication. When the engine is turning 1500RPM, the starter is doing about WARP 4. That'll last about 2.7 minutes without constant lubrication, which makes the whole thing way more complex than it really needs to be.
There isn't a starter-generator off the shelf that would turn over a 30HP engine without the crankshaft pulley being over 3' in diameter.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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