Mopar-man
Enthusiast
Why does the 8.4 liter engine rev higher (making power) than the 8.3 liter engine ?
RPM ?
- Thread starter Mopar-man
- Start date
Peter Nielsen
Viper Owner
And why does it idle higher? My 2006 was idling around 650 rpm. My 2008 idles around 850 rpm...
Are you asking why it physically is able to rev higher, or why it makes more horsepower at higher RPM's?
Basically, it has a lighter & more stable valvetrain that allows higher revving without power-robbing valve float. [ignoring the oil system changes that help its ability to live at high RPM's]
The reason it makes more power at high RPM is primarily due to its head and manifold design. Air & Fuel= Torque. Torque at high RPM's= Horspower. Since the engine can rev higher, and is able to flow more combustible gases at those RPM's, it makes more horsepower as a result. The older engines can actually produce more torque at many different RPM's, but they run out of breath at higher RPM, limiting their horsepower in comparison to the Gen-4. This is also why Gen-2/Gen-3 Vipers have seen such drastic gains from a head and cam package, they are pretty weak on the flow charts in stock form... not so with the Gen-4.
Basically, it has a lighter & more stable valvetrain that allows higher revving without power-robbing valve float. [ignoring the oil system changes that help its ability to live at high RPM's]
The reason it makes more power at high RPM is primarily due to its head and manifold design. Air & Fuel= Torque. Torque at high RPM's= Horspower. Since the engine can rev higher, and is able to flow more combustible gases at those RPM's, it makes more horsepower as a result. The older engines can actually produce more torque at many different RPM's, but they run out of breath at higher RPM, limiting their horsepower in comparison to the Gen-4. This is also why Gen-2/Gen-3 Vipers have seen such drastic gains from a head and cam package, they are pretty weak on the flow charts in stock form... not so with the Gen-4.
Flash1034
Enthusiast
More importantly, when are we going to see a tuner program to get rid of the throttle lag and boost the HP?
Flash
Flash
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