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Old 06-01-2020, 11:47 AM   #25 (permalink)
California98Civic
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Quote:
Originally Posted by serialk11r View Post
Actually now that I think about it, it's possible changing the damper's rotational inertia by a little is not a big deal. The maximum crankshaft displacement would increase by however much you reduce the damper mass, but there has to be some safety factor built in, and no one is holding the engine right at the worst rpm for a long time.

The belt could possibly get chewed up faster, but serpentine belts are flexible and I want to say a little bit of vibration wouldn't kill them.
I agree. When I research aftermarket crank pulleys, or milling mine, to reduce rotational mass, I ran into these debates. But these little four cylinders and the RPMs we're runni g them at... not much risk. The OEMs, bless 'em, overbuild... just the way I like my Hondas... overbuilt by the OEMs. I did not add the lightweight pulley in the end (price and availability).
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



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