4.5 L Duramax LMK
General Motors 4.5L Duramax will provide a fuel efficient & more powerful alternative to V-8 gasoline engines in their line of 1/2 trucks. Production was initially projected for 2010, but GM's financial crisis has forced them to postpone the introduction of the Duramax 4500. At this time, it is unknown when the 4.5L Duramax will go into production.
4.5 L Duramax Specifications:
| Name: | Duramax 4500 LMK |
Manufacturer: |
General Motors |
Configuration: |
72 degree V-8 Diesel |
Dispalcement: |
4.5 liters, 275 cubic inches |
Block Material: |
Compacted Graphite Iron (CGI) |
| Compression Ratio: | 16.0:1 |
Bore: |
N/A |
Stroke: |
N/A |
Injection System: |
- 29,000 psi Common rail injection system - Piezo injections |
Turbocharger: |
Single variable geometry turbocharger |
Valvetrain: |
- Dual overhead camshaft - 32 valve, 4 vavles per cylinder - Aluminum heads |
Emissions Controls: |
- Exhaust gas recirculation (EGR) - Catalytic converter - Diesel particulate filter (DPF) - Urea injection |
| Horsepower: | Minimum rating of 310 HP* |
| Torque: | Minimum rating of 520 lb-ft.* |
| Possible Applications: | 1/2 GMC & Chevrolet trucks |
*General Motors has not stated exact or definite power output figures. Power output are said to meet or exceed these ratings.
4.5L Duramax Fuel Economy:
- 25 percent increase in fuel economy over similar gasoline powered truck under light load conditions.
- 40 - 70 percent increase in fuel economy over similar gasoline powered truck under higher load conditions (towing/hauling).
4.5 L LMK Information:
- General Motors financial crisis has put a hault on the Duramax 4500, which was projected to be availabe in 2010. Exact production dates are unknown at this time.
- The Duramax 4500 was created without the help of diesel partner Isuzu, a first in Duramax history.
- The Duramax 4500 features a unique head design in which the exhaust manifolds exit into the engine valley while the intake portion of the head is located on the top of the cylinder head. Doing so increases the thermal efficiency of the turbocharger, which has been placed in the engine valley.
- The Duramax 4500 does not have intake manifolds.
- GM utilizes a 72 degree V configuration in order to make the engine narrower. Doing so allows the 4500 to fit virtually anywhere a small block Chevrolet gasoline engine will.
- Duramax 4500 meets tier 2 Bin 5 emissions requirements, making it 50-state legal.
- View images of the Duramax 4500 Engine