Engine Comparisons: MDPT 6.6L Land Vehicles



Recent comparison of the MDPT 6.6L engine modified for off-road land vehicle use in extreme climates:


Engine Model: MDPT VGT

Displacement: 6.6 litre

Cylinders: 8

Bore X stroke: 103 X 99 mm

Power: 100-280Kw depending on rpm and application

Compression ratio: 16,0

Turbocharger type: VGT

Fuel type: Diesel

Min working temp: -30C

Fuel system: Bosch common rail 1800bar

Weight: approx 360kg (dep on accessories)

Size (LXWXH): 812 X 680 X 780 mm

Scope of Supply:

  • Starter motor and alternator
  • Exhaust manifold and turbocharger
  • Intake manifold and basic air filtration system
  • Integrated oil cooler
  • Integrated oil filter
  • Integrated fuel filter
  • Belt system and tensioner
  • Flywheel
  • Engine wiring harness and ECU (J1939)
  • BTU data for sizing radiator and intercooler
  • Diagnostics software


  • SAE #3 bell housing and matching coupler
  • Cooling package including radiator, intercooler, electric fan, hoses etc
  • Engine monitoring displays of different sizes
  • Multiple engine mounting options
  • Multiple calibration options for continuous and variable speed applications and different

duty cycles.

  • Multiple air intake option
  • Multiple exhaust system options
  • Private label diagnostics software (with your company logo)
  • Diagnostics and mechanical training
  • Hardware CAN cable for diagnostics software
  • Emissions certifications
  • NATO Milspec certification
  • After treatment components



1. Extended Life Cycle: MDPT engines have a much longer life cycle than competing engines. There are several reasons as to why. First, the GM block has been produced in the millions of units, and is currently used by military organizations around the world. The reliability is unmatched. The MTBO of MDPT engines can range from 2,500 hours to over 5,000 hours depending on rating, climate, use, and engine MAP. At an average cost of a rebuild exceeding 60% of the cost of replacement, this long life cycle translates into thousands of Euros per year in savings. Additionally, the power and torque curves of competing engines show “spikes” that increase strain and wear of not only engines, but other vehicle components, and thus significantly shorten the life cycle and service intervals necessary to keep the engines running. Competing engines typically start with larger engines that are de-rated in order to provide a longer life cycle. The MDPT engines are designed specifically for compact, light, long life applications. The VGT Series is NATO compliant and certificates can be issued.

2. Customizable: Truck engines are designed to provide a huge amount of torque at the outset, and gradually decrease as momentum is maintained on a highway. This situation rarely occurs with off-road vehicles. The NIRA ECU in MDPT engines is completely customizable. Cummins and other manufacturers tend to use Bosch ECUs for engine controls that cannot be changed without significant extra expenditures (If it can be done at all. The Bosch ECU itself is limited in functionality.) What does this all mean? For instance, MDPT can “shift” the power and torque curves based on customer requirements. For example, with amphibious vehicles, MDPT engines can be programmed to allow more torque and power while operating amphibious, all at a touch of a switch by the operator. This functionality is known as an engine MAP, and MDPT can allow multiple MAPs that can easily be altered based on customer requirements. Other examples:

  • Use of the vehicle in urban settings
  • Use under extreme environmental conditions
  • Optimized for speed on-road
  • Optimized for use off-road
  • Extra torque for rapid acceleration

3. Reduced Vibration and Noise: MDPT engines are a V-8 configuration that, due to the laws of physics, produce far lower levels of torsional vibration than inline 6-cylinder engines.  As to noise, MDPT engines are among the quietest in the market. MDPT has extensive experience with noise reduction and control. Engine noise can be minimized before shipment in our test bays and labs, and further reduced by engineering design and aftermarket silencing systems that we can package with the engine.

4. Light Weight: The MDPT VGT Series of engines weigh a mere 360 kg, compared to the Cummins ISB at 485 kg or the QSB5.9 at over 500 kg. The MDPT engines were designed for high power to weight ratio. Competing engines are de-rated from higher horsepower, and are thus much heavier.

5. Torque: Competing engines have torque curves that sharply spike on the low end of the RPM range and then sharply decrease. MDPT engines feature torque curves that evenly distribute the torque produced at a high level along the entire curve.

6. Engineering: MDPT provides a complete turnkey package. Factory supervision and consultation will be provided from initial engineering, to drawings, to installation, commissioning, mechanical training, and operations training.

7. Rating for Climate: MDPT engines come rated for the local climate. Customers in tropical climates will not see the power loss that is commonly seen with competing engines.

8. Emissions: MDPT engines are in compliance with Tier IV off-road requirements in the EU or USA.

9. Fuel Efficiency: The VGT turbochargers on MDPT engines provide high power while minimizing fuel consumption, to a far greater extent than older, mechanical engines.

10. Compact Size: MDPT engines are designed to fit in compact engine compartments. We are one of the smallest engines in terms of size on the market.

11. Extended Warranty: An extended warranty is available.

engine comp

MD:                                       812 X 680 X 780

Cummins:                       844 X 950 X 857

Scania:                               1406 X 861 X 1113

CAT:                                     1089 X 986 X 970

Iveco:                                  1017 X 805 X 790




vgt torque


cummins torque


scania torque

scania power


cat torque



Iveco torque