Ford Rules Posted February 6, 2007 Share Posted February 6, 2007 I don't know that much about engines, but numbers-wise and performance-wise, how much could Ford improve the 5.4L 3V V8 by upgrading it to 4 valves per cylinder instead of the current 3? They did the same thing with the 4.6L V8 by going from 2 to 3 valves per cylinder for the Mustang and Explorer, so would there be any harm done by doing it for the 5.4L? Quote Link to comment Share on other sites More sharing options...
boegey Posted June 7, 2007 Share Posted June 7, 2007 I don't know that much about engines, but numbers-wise and performance-wise, how much could Ford improve the 5.4L 3V V8 by upgrading it to 4 valves per cylinder instead of the current 3? They did the same thing with the 4.6L V8 by going from 2 to 3 valves per cylinder for the Mustang and Explorer, so would there be any harm done by doing it for the 5.4L? The Navigator was originally a 4 valve 5.4 motor making 300 HP. The new 3 valve 5.4 makes the same 300 HP and uses variable valve timing. The 4 valve is more expensive to boot. Also, Cobras were 4 valve 4.6 making 305 HP and todays GT uses a 3 valve variable valve timing 4.6 to make 300 HP. The variable exhaust valve timing also increases torque over the 4 valve non variable motors. Boegey Quote Link to comment Share on other sites More sharing options...
theoldwizard Posted June 7, 2007 Share Posted June 7, 2007 ...The 4 valve is more expensive to boot. ... Make that WAY WAY more expensive ! When the name of the game is "make a buck", you are not going to see it happen ! Quote Link to comment Share on other sites More sharing options...
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