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Old 11-22-2011, 03:33 PM   #8 (permalink)
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Join Date: Jun 2008
Location: Richland,WA
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Das Schlepper Frog - '85 Mercedes Benz 300SD
90 day: 23.23 mpg (US)

Gentoo320 - '04 Mercedes C320 4Matic
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Originally Posted by Piwoslaw View Post
From what I've read on these forums (and if I haven't mixed it up), the actual combustion process itself is very close to something like 95% or 99% efficient. Anything that improves on that, even bumping it up to 100% efficient, still won't be noticeable by the time it goes through the drivetrain and wheels. It MAY barely help (performance and/or emissions) in an old engine in desperate need of a tune-up, but a newer engine won't show anything.
Small piston aircraft have dual sparkplug systems. Part of the warm up and check procedure is to run off one side then the other to check for fouled or faulty plugs or a bad magneto. Normally you run off both and you can usually feel/hear that they get more power from the same amount of fuel running on both sparkplug systems. So a hotter and fatter spark will play a roll. Like I said how much is debatable.
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