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Old 02-26-2013, 11:52 PM   #6 (permalink)
13B_88FC
EcoModding Lurker
 
Join Date: Jan 2013
Location: Oregon, US
Posts: 43

ZoomFreakingZoom - '88 Mazda RX7 Convertible
90 day: 19.02 mpg (US)

Geo - '96 Geo Prizm Base
90 day: 32.42 mpg (US)
Thanks: 2
Thanked 2 Times in 2 Posts
Interesting. It seems like that offset design (just from looking at the picture) would significantly reduce piston ring friction during the intake and power stroke while increasing it during the compression and exhaust stroke. I guess you would gain the most by decreasing friction during the power stroke, even though it is offset slightly when the piston is going back up.

I appreciate the explanation(s).
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1988 rx7 convertible. Streetported, racing beat header and presilencer replacing all 3 catalytic converters. Atkins 6 port sleeves. K&N cone filter intake. 22mpg average, 27mpg max. Spreadsheet (updated regularly):
https://dl.dropbox.com/u/5310442/198...%20mileage.xls
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