Forum Discussion
Bedlam
Jun 11, 2015Moderator
Duty cycle of the engine and transmission definitely play a role. My chassis cab has a detuned Cummins because expected use will be harder than a pickup and this is how they can keep the longevity up.
I used to tow more with a normally aspirated 2200cc Perkins GB diesel that had almost half the horsepower of my 1900cc VW R4 ALH turbo diesel. Part of the difference is frame verse uni-body receiver attachment but the rest is duty cycle design. The Perkins was designed for flat out all the time while the VW is designed to only run peak output for limited periods of time. BTW: The Perkins would tow a 2000+ lb Scamp TT at 55 mph and get 20-25 mpg and the VW will tow my 1500+ lb flat bed and get similar mileage.
Speed and frontal area will be the biggest factors in mileage differences.
I used to tow more with a normally aspirated 2200cc Perkins GB diesel that had almost half the horsepower of my 1900cc VW R4 ALH turbo diesel. Part of the difference is frame verse uni-body receiver attachment but the rest is duty cycle design. The Perkins was designed for flat out all the time while the VW is designed to only run peak output for limited periods of time. BTW: The Perkins would tow a 2000+ lb Scamp TT at 55 mph and get 20-25 mpg and the VW will tow my 1500+ lb flat bed and get similar mileage.
Speed and frontal area will be the biggest factors in mileage differences.
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