2020 F-53 V-8 Specs
The New 2020 F-53 chassis V-8 will have 350 HP and 468 pounds of torque with a 6 speed trans The 2006 to 2015 V10 Specs The 6.8-liter TritonTM V-10 engine's best-in-class 362 horsepower and 457 fo...
Forum Discussion
carringb wrote:
The new 7.3L is certified under the using the EPA's Dyno certification. These numbers report lower than the former Chassis-certification numbers.
Certification has to do with gross vehicle weight. It has been a long time since I was involved with this, but I think over 10,000 GVW it is dyno certified. (There are some differences in the chassis test for above and below 8,500 GVW.) The certification process proves that it meets government specified emissions. It also generates an MPG which is used in Corporate Average Fuel Economy (CAFE) calculation as well as HP and torque ratings.
IIRC, dyno cert is "engine only". No transmission, etc. I believe it requires "extended" (minutes) operation at or near full power. A chassis certification has very brief (seconds) of operation at full power.
