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Old 03-19-2010, 01:34 PM   #43 (permalink)
Wonderboy
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Join Date: Jun 2008
Location: Chicago
Posts: 674

The Fruit Bat - '01 Honda Insight
Last 3: 54.26 mpg (US)

Current - '21 Subaru Impreza Wagon
90 day: 34.36 mpg (US)
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We discussed that before in this thread - it is measurable by seating it in a cylinder with a piston and pulling it with a spring scale. The argument was that brand new rings that hadn't been broken in vs. the used ones that have a nice shiny broken in edge wouldn't be a fair comparison of spring force. I can't think of a way off the top of my head to make it fair. Even if I could make it fair, there is no "spec" spring force that I've been able to find for anything let alone a G10, which leads me to believe it actually doesn't matter too much once the engine gets to operating temp. I got the heating idea form the site I linked to in my previous post. However, this person was making custom rings from one raw material, not existing rings, so your bi-metal thing puts yet another wrench into the gears here because I believe I did notice that the stock XFi rings have one metal as a "core", "wrapped" in another metal.
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