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Frank Lee · 01-22-2012, 04:31 PM

^Yeah.

I think it has to do with how much combustion heat energy pushes on the piston vs dissipating into the cooling system.

Too slow rpm = more time for heat to go into coolant
Too fast rpm = less push on piston; more internal engine friction

01-22-2012, 04:31 PM	#15 (permalink)
Frank Lee (: Join Date: Jan 2008 Location: up north Posts: 12,762 Blue - '93 Ford Tempo Last 3: 27.29 mpg (US) F150 - '94 Ford F150 XLT 4x4 90 day: 18.5 mpg (US) Sport Coupe - '92 Ford Tempo GL Last 3: 69.62 mpg (US) ShWing! - '82 honda gold wing Interstate 90 day: 33.65 mpg (US) Moon Unit - '98 Mercury Sable LX Wagon 90 day: 21.24 mpg (US) Thanks: 1,585 Thanked 3,555 Times in 2,218 Posts	^Yeah. I think it has to do with how much combustion heat energy pushes on the piston vs dissipating into the cooling system. Too slow rpm = more time for heat to go into coolant Too fast rpm = less push on piston; more internal engine friction __________________