Below is an overview of the engines powering these machines and the field test results they delivered. It’s important to note that any differences between declared and actual performance stem from the fact that declared values are measured at the flywheel, while actual results are recorded at the power take-off, subject to mechanical energy losses inherent to each machine.
Case IH “Puma 240 CvxDrive,” FPT Industrial “N67”
The six-cylinder Fpt Industrial “N67” engines in the “Puma 240 CvxDrive” have a displacement of 6,700 cc and are among the most widely used tractor engines, covering power ranges from 165 to 230 hp and representing nearly 43% of the segment. In off-road applications, the engine can reach up to 236 kW (321 hp) at 2,000 rpm, thanks to cylinders with a unit volume of 1.121 liters, a bore of 104 mm, and a stroke of 132 mm. The direct injection common rail system operates at 1,600 bar, while forced air intake is managed by a turbocharger with a wastegate valve.
With these design features, the “Puma 240 CvxDrive” achieves a peak power of 199 kW (271 hp) at 1,800 rpm under “Power Management,” yielding over 40 hp per liter and a mean effective pressure just under 20 bar. The average piston speed is just below 10 meters per second. Notably, “Power Management” can be sustained continuously in the “Nef” engines, unlike some systems limited to short intervals.
Without “Power Management,” peak power drops to 191 kW (260 hp), while nominal power stands at 177 kW (240 hp) at 2,200 rpm. In independent tests, the Case Ih “240 CvxDrive” recorded peak power of 175 kW (238 hp) at 1,800 rpm, while nominal power at 2,200 rpm was approximately 150 kW (204 hp). Hourly fuel consumption was around 46 liters/hour, with specific consumption rates of 223 and 255 g/kWh, respectively.
The “Puma 240 CvxDrive” claims a maximum torque of 1,159 Nm at 1,500 rpm, offering a specific torque of 172 Nm per liter, on par with Fendt models. Tests recorded a peak torque of approximately 1,000 Nm at 1,500 rpm. Compact dimensions and a weight of 530 kg give it a power-to-volume ratio nearing 330 hp per cubic meter and a power-to-weight ratio of 2 kg per hp.
Fendt “726 Vario Gen7,” AGCO Power “Core75”
The “Core75” is a recent addition to Agco’s engine offerings, specifically designed for tractors. It boasts the largest displacement and highest torque and power ratings in its class. With a displacement of over 7.5 liters (110 mm bore, 132 mm stroke), the top-performance version delivers 340 hp at 1,850 rpm and 1,450 Nm of torque at 1,500 rpm.
In the “low-speed” agricultural variant, torque begins at 1,200 rpm and remains constant up to 1,500 rpm, while peak power is available between 1,500 and 1,700 rpm. The Fendt “726 Vario Gen7” delivers 193 kW (262 hp) at 1,500 rpm, matching its nominal power at 1,700 rpm. This translates to about 35 hp/liter, with a mean effective pressure of 20.5 bar and a piston speed of 7.5 meters per second.
Independent tests recorded a peak power of 180 kW (244 hp) at 1,400 rpm and 175 kW at nominal speed (1,700 rpm), with hourly fuel consumption of approximately 46 liters/hour and specific consumption around 215 g/kWh. The “Core75” achieved a maximum torque of 1,318 Nm between 1,200 and 1,300 rpm, with test results reaching 1,237 Nm at 1,300 rpm. With similar dimensions to other units, it offers a power-to-volume ratio of 276 hp per cubic meter and a dry weight of 695 kg, yielding a power-to-weight ratio of 2.5 kg per hp.
Compliance with Stage V emissions standards is achieved via DOC and DPF filters in tandem with an SCR system, excluding EGR systems to enhance efficiency.
John Deere “6R230,” John Deere “PowerTech PSS 6068HL550”
The six-cylinder John Deere “PSS 6068HL550” powers all top-tier models in the “6R” series, delivering up to 275 hp at 1,900 rpm in the “6R250.” This increases to 301 hp with the intelligent power management system, achieved through a twin-turbocharging system featuring a fixed-geometry turbo for low RPMs and a variable-geometry turbo for medium to high RPMs.
The engine’s cylinders have a bore of 106 mm and a stroke of 127 mm, resulting in a total displacement of 6.721 liters. The “6R230” model offers a peak power of 281 hp at 1,900 rpm with intelligent power management and a nominal power of 253 hp at 2,100 rpm. Specific power reaches nearly 42 hp/liter, with a mean effective pressure of 19.5 bar and average piston speed just under 9 meters per second.
In independent tests, without intelligent power management, the engine achieved peak power of 166 kW (225 hp) at 1,800 rpm, compared to the declared 186 kW (253 hp). Nominal power was recorded at 148 kW (200 hp) at 2,100 rpm versus a declared 169 kW (229 hp). Hourly fuel consumption was around 46 liters/hour, with specific consumption of 230 g/kWh.
Torque values of 1,077 Nm at 1,600 rpm closely matched test results of 973 Nm, yielding a specific torque of 160 Nm per liter, slightly below the other engines reviewed. The engine is designed for durability, with robust dimensions and masses among the highest in its category, featuring a nearly one-cubic-meter volume and a dry weight of 730 kg.
Title: UniBo-Dig Certification | Engine Comparison Benchmarks
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