Source: Wikipedia. This was no small feat. Diesel engines are typically larger and heavier than their gasoline counterparts. This is because of all the additional equipment required for a diesel engine to inject fuel into a container of compressed air: a turbocharger, an injection pump, and an intercooler, among other things. GMC solved this problem by installing fuel rails directly into the valley of the engine block and attaching the oil cooler to the left side of the cylinder block.
This, alongside simplified coolant piping that was strung through the flywheel housing, reduced the overall size while ensuring that even temperatures were maintained on both sides of the engine. The Duramax L5P, the current model first released in the model year, easily takes the crown as the best Duramax engine yet produced. Several Duramax engines were produced throughout the years to comply with ever-shifting EPA emissions standards.
First up is the LB7, which first saw the light of day in Source: Truck Trend. The LB7 was the first Duramax engine and was made from — It was produced just as GMC was retiring its 6.
It also comes with high-pressure common-rail direct injection along with a composite cylinder head. It is turbocharged and intercooled, and its valvetrain has forged steel rocker arms with bridges to operate two valves.
The whole engine weighs in at lbs. Thanks to its At power levels close to stock, we liken cracked piston scenarios in an LBZ to the killer dowel pin striking in a 5. As such, this crankcase is now used as the foundation in many performance engine builds in the aftermarket. To free up horsepower it dished out hp, stock , the LML also sports the lightest rotating assembly of any Duramax. The pit-in-the-stomach double-whammy is that, when the twin-piston CP4. No other Duramax in history has offered what the L5P does.
The Bosch CP4. Early on customers came forward complaining of severe overheating, and also in some situations blown head gaskets. Initially GM denied it was a problem, but after being sued by a consumer group, GM relented and included overheating and blown head gaskets as a warranted item. It is a valve design with high-pressure common-rail direct injection and aluminum cylinder heads.
To meet this goal they turned to a newly developed Garrett turbocharger with a variable geometry vane system and they installed an Exhaust Gas Recirculation valve or EGR Valve. Learning from problems with injectors in the previous LB7 GM changed the valve covers to allow access to the injectors without having to remove the valve covers, saving significant labor costs if injector replacement became necessary.
It has a more powerful tune loaded into the computer that allows it produce more power and torque. Diesel Oxidizing Catalyst where the fuel is burned to elevate the temperature of the exhaust. This hot exhaust flows into the DPF and burns the trapped soot. Power and torque were up to hp at 3, rpm and lb-ft at 1, rpm.
Of note, the LLY was also available in the Chevrolet Express and GMC Savana, though power was restricted slightly to preserve the vans' four-speed automatic transmissions. Featuring stouter connecting rods, new pistons, higher-pressure fuel injection, and improved emissions controls, the LBZ is a favorite of diesel enthusiasts thanks to its appetite for punishment.
Taking full advantage of that engine output is another version of the Allison automatic transmission, this time featuring six forward gears.
This engine was the first to use a diesel particulate filter, and it came with other emissions enhancements, including cooled exhaust gas recirculation, closed crankcase ventilation, and new engine control software.
In spite of those hurdles, the LMM produces hp at 3, rpm and lb-ft at 1, rpm.
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