Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Blackfly XFi? Geo Metro economy cam shaft swap! Update: swap completed

MetroMPG · 11-28-2007, 02:47 PM

OK, smartypants... if a cam swap can improve efficiency, why don't all Metros have this kind of cam?

Because the cam profile is not good for top end performance. Lowers the redline (valves are more prone to floating than with the stock cam).

Remember the XFi also has a taller than regular final drive, so its cam profile goes better with that.

11-28-2007, 02:47 PM	#11 (permalink)
MetroMPG Batman Junior Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 22,530 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 54.46 mpg (US) Even Fancier Metro - '14 Mitsubishi Mirage top spec 90 day: 70.75 mpg (US) Appliance car Mirage - '14 Mitsubishi Mirage ES (base) 90 day: 62.14 mpg (US) Thanks: 4,078 Thanked 6,978 Times in 3,613 Posts	OK, smartypants... if a cam swap can improve efficiency, why don't all Metros have this kind of cam? Because the cam profile is not good for top end performance. Lowers the redline (valves are more prone to floating than with the stock cam). Remember the XFi also has a taller than regular final drive, so its cam profile goes better with that. __________________ Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata Honda mods: Ecomodding my $800 Honda Fit 5-speed beater Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage. Ecodriving test: Manual vs. automatic transmission MPG showdown EcoModder has launched a forum for the efficient new Mitsubishi Mirage www.MetroMPG.com - fuel efficiency info for Geo Metro owners www.ForkenSwift.com - electric car conversion on a beer budget