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Old 07-22-2018, 06:45 AM   #39 (permalink)
stefanv
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2001 Saturn - '01 Saturn SL1
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Quote:
Originally Posted by oldtamiyaphile View Post
Correctly bump starting shouldn't be hard on the clutch. It takes 1/10th of a second to spool up around 40kg of mass inside a small engine. It takes about a second of slip to get a 1000kg car moving from a stand still. The wear rates aren't even remotely comparable.
The difference is in the speed delta. To get the car moving, you're starting with an 800 or so RPM/difference (engine speed 800 RPM, driveline speed 0). To restart the engine at speed, the difference is around 2000 RPM (engine speed 0, driveline speed 2000). So that 1/10th of a second is probably about equivalent to 1/2 a second of getting a car moving.
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Stefan Vorkoetter: Programmer, hobbyist, amateur watchmaker, pilot, and collector of fountain pens, slide rules, calculators, and watches.

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