Automobile Magazine has a feature comparing a 1985 CRX HF to the gen 2 Insight.
I didn't know it had a 2-ring piston style (like the XFi), but that's what the article said:
Quote:
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Civic's 1.5-liter unit, clever updates such as smaller crankshaft journals and fewer piston rings (two per cylinder, versus the 1.5's three) were implemented in the name of reduced internal friction.
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full article:
1985 Honda CRX HF vs. 2010 Honda Insight - Modern Automotive Technology vs. Past Technology - Automobile Magazine