How Much Horsepower Does A 6.6 Duramax Diesel Have?

The 2017 Chevy Silverado HD and GMC Sierra HD are now available with a revised 6.6L Duramax turbo-diesel V8 that delivers an astounding 445 horsepower at 2,800 rpm and, more crucially, an earth-shattering 910 lb-ft of torque at just 1,600 rpm, as previously revealed last autumn.

Along with a 19 percent boost in maximum torque, the new Duramax provides a quieter and smoother ride for improved refinement. In fact, at idling, engine noise is decreased by 38%.

The new 6.6L Duramax is paired with the Allison 1000 6-speed automatic transmission. It has been significantly updated, including a new torque converter, to meet the engine’s increased torque capacity.

Executive Chief Engineer Jeff Luke introduces the new Duramax in detail in a new video released by General Motors. It’s not to be missed!

What is the horsepower of a 6.6 Duramax?

This next-generation model provides more horsepower and torque than ever before, with an SAE-certified 445 horsepower (332 kW) and net 910 lb.-ft. (1,234 Nm) to make hauling and trailering easier and more confident. The L5P produces more power thanks to higher turbocharger boost pressure compared to the preceding engine.

In addition to a 19 percent boost in maximum torque over the existing Duramax 6.6L, the revised turbo-diesel is quieter and smoother, resulting in improved refinement. In fact, engine noise at idling has been decreased by 38%.

Is a 6.6 Duramax diesel a good engine?

Due to its absence of emissions control equipment, the LB7 remains immensely famous among diesel enthusiasts as the original Duramax model. In general, it’s a tough and dependable engine. As the initial models approached 100,000 miles, however, significant concerns arose. On the LB7 engines, injector failure was a typical occurrence.

Even GM noticed the issue, since the original design was later modified and the revised Duramax parts were given a 200,000-mile warranty. It’s critical to check if a used LB7 still has the original factory injectors before purchasing it. If it happens, you’ll need to look for a new work soon. Other serious issues with the LB7 included:

How much horsepower does a 2022 6.6 Duramax have?

Sierra has a reputation for outstanding performance, particularly in the diesel heavy-duty vehicle market. While the 2022 Sierra Heavy Duty features powertrain upgrades across the board, GMC’s famed optional Duramax Diesel engine and 10-Speed Allison Automatic Transmission remain the best in towing power. The Duramax 6.6L Turbo-Diesel V8 engine produces 445 horsepower and 910 pound-feet of torque. The Allison 10-Speed Automatic Transmission also allows the engine to run in an ideal range at all times, regardless of load or terrain conditions, thanks to its close gear spacing.

What year is the best 6.6 Duramax?

General Motors’ Duramax engine line consists of 6.6L diesel engines. They’re made by DMAX, an Ohio-based diesel maker that’s a joint venture between GMC and Isuzu, a Japanese vehicle and diesel engine manufacturer.

A Duramax engine from LML. Have you ever noticed how closely an engine resembles a heart? In other words, this is how a robot’s heart might appear. I’m sorry, I was just thinking out loud. Wikipedia is the source of this information.

The main goal in designing the Duramax was to create a diesel engine that could fit in the same places as a traditional gasoline engine in a full-size pickup truck. This was no easy task. Diesel engines are often larger and heavier than gasoline engines. This is due to the additional equipment required for a diesel engine to inject fuel into a compressed air container, such as a turbocharger, injection pump, and intercooler.

Fuel rails were installed straight into the valley of the engine block, and the oil cooler was attached to the left side of the cylinder block, which solved the problem for GMC. This, combined with simplified coolant piping strung through the flywheel housing, resulted in a smaller overall size while guaranteeing that all sides of the engine were kept at the same temperature.

Don’t worry, we’re not going to keep you guessing. The new Duramax L5P engine, which debuted in the 2017 model year, comfortably wins the title of best Duramax engine ever made. At the end of this piece, we’ll go over the L5P’s numerous enhancements. But first, let’s take a look at the prior Duramax models to see how far they’ve progressed.

How many MPG does a 6.6 Duramax get?

On the freeway, this Duramax 6.6-liter V-8 scores 17 to 19 mpg. In-town miles per gallon has yet to be properly tested. A six-speed automatic transmission is standard on this Sierra.

What problems does the 6.6 Duramax have?

Water pump failures are prevalent on LB7 and LLY engines, thus the 2006 model year LLY received a rebuilt, larger water pump to address this issue. A water pump on a 2001 to 2005 model year engine is likely to need replacement in as low as 75,000 miles; this appears to be a flaw in the early water pump design.

Engine Overheating, High Engine Coolant Temperature, Blown Head Gasket(s)

Overheating difficulties are particularly common in 2005 and previous versions, while larger radiators, fans, and water pumps were introduced beginning with the 2006 model LLY. Overheating is frequently caused by a faulty fan clutch, which prevents the engine fan from generating extra airflow across the radiator when it is needed. A dirty/clogged radiator is thought to be a contributing factor, as the grime that builds up on the radiator over time lowers its effectiveness in releasing heat. Engine overheating is also a regular outcome of water pump failure. Engine overheating is a common cause of head gasket failure.

Glow Plug Failure, Glow Plug Tips Breaking

Due to malfunctioning glow plug modules, the 2006 model year LLY and later LBZ both had a high rate of glow plug failure. The glow plug module would repeatedly cycle the glow plugs, causing the glow plug tips to become brittle and, in some cases, break off while the engine was running. In such cases, engine damage is likely to be severe. GM discovered the issue, and affected trucks were recalled so that technicians could reprogram or replace the glow plug module, so removing the risk. While there shouldn’t be many vehicles on the road that are still at danger, you should err on the side of caution and have your local GM dealer verify that this problem was handled by a prior owner if you decide to acquire an impacted model year.

Turbocharger Oil Ingestion (PCV Design Flaw)

Excess crankcase pressure is vented into the intake with the Duramax PCV arrangement. Engine oil is fed into the turbocharger as a byproduct of the process. The engine oil coats the inside of the intercooler and the intercooler tubing over time. The main issue is that enormous amounts of oil may collect in the intercooler boots, leading them to degrade quickly. There are a variety of aftermarket equipment on the market that reroute the PCV line so that it vents into the atmosphere rather than the intake, as well as a number of “DIY” solutions.

NOx Sensor Failure

For the 2011 model year, the Duramax LML was introduced with the most advanced emissions system yet. The selective catalyticreduction (SCR) system, which requires a continuous supply of diesel exhaust fluid (DEF) to allow the reaction that converts nitrous oxides into more desirable byproducts, was one of the most recent additions. In order to correctly control the injection of DEF into the catalyst, the system relies on different sensors plugged into the exhaust system.

Not surprisingly, the new system was riddled with flaws, the majority of which would be straightened out before engines for the 2012 model year were produced. The most typical issue was the failure of one of the system’s two NOx sensors on a regular basis. DEF level sensors, DEF pumps, and DEF tank warmers were among the other issues (which often allowed DEF to freeze in extremely cold environments). Owners of 2011 model year trucks may or may not be covered by an extended warranty on NOx sensors, as GM increased the warranty duration for “affected trucks” due to the high frequency of problems.

DPF Clogging

Clogging of the diesel particulate filter was a common problem with the Duramax LMM, although it became less prevalent with the introduction of the LML’s selective catalytic reduction technology. DPF blockage occurs when soot and ash accumulate in the particle filter, reducing exhaust flow and resulting in a variety of issues such as rough driving, excessive smoke, limited performance, and poor fuel economy. Soot is trapped by the DPF and easily removed during the regeneration process, while ash deposits do not burn easily under conventional regeneration settings. Because the passive and active regeneration cycles will be disrupted if you drive in heavy city traffic and make many short journeys, you will be more prone to DPF blockage. The following steps can greatly lower the likelihood of DPF clogging:

  • When an active regeneration cycle starts, keep driving at highway speeds until the procedure is finished.
  • Avoid frequent starts and stops, particularly if they prevent the engine from reaching maximum operating temperature.
  • Use a full synthetic low ash engine oil that complies with the API category requirements.

Which engine is better Duramax or Cummins?

The Cummins engine is currently a 6.7-liter inline-six, whilst the Duramax is a 6.6-liter V8. The Duramax is the most powerful engine in terms of horsepower, but the Cummins is the most powerful in terms of torque, with values up to 1,000 ft-lbs depending on the truck.

What year Duramax should I stay away from?

The Duramax V8 engine is a 6.6-liter diesel engine manufactured by DMAX, a joint venture between GM and Isuzu.

The Duramax engine replaced the 6.2L and 6.5L Detroit engines in 2001. In the light diesel sector, it proved to be a formidable competitor. The engine has undergone various changes and enhancements over the years to ensure that GMC and Chevrolet pickup trucks outperform their competitors.

Quick Answer: Avoid Duramax Year Models 2001-2010

The Duramax has a long and illustrious history. Any GM vehicle equipped with the Duramax engines from 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, or 2010 should be avoided. In short, the performance of recent model years has improved.

The 6.6L Duramax LB7 engine was utilized in the Chevrolet Kodiak, Chevrolet Silverado, GMC Topkick, and GMC Sierra HD from 2001 to 2004. Because it lacked a diesel particulate filter (DPF) and exhaust gas recirculation, it was the most basic model in the lineup (EGR). These were added subsequently.

In 2004, the LB7 was replaced by the Duramax LLY. Until 2005, it was available in the Chevrolet Silverado, Hummer H1 Alpha, and GMC Sierra. The Duramax LBZ was then offered for the Chevrolet Silverado HD, Chevrolet Kodiak, Chevrolet Express, GMC Sierra, GMC Topkick, and GMC Savanna from 2006 to 2007.

The Duramax LMM, which debuted in 2007–2010, is the penultimate engine on our list that we recommend avoiding. The Chevrolet Kodiak, Silverado HD, Express, and GMC Topkick, Sierra HD, and Savanna are all equipped with it. Continue reading to learn more about the troubles that affect certain Duramax model years.

What Duramax has the most power?

The Duramax L5P diesel engine is the most recent variant of the Duramax V8 diesel engine. (Y) (engine code) (engine code) (engine code) (engine code) With 445 horsepower (332 kW) at 2,800 rpm and 910 pound-feet (1,234 Nm) at 1,600 rpm, it is the most powerful diesel pickup truck engine GM has ever developed.

How much horsepower does a 2023 Duramax have?

The next-generation 6.6L Duramax diesel V8 engine might produce 505 horsepower and 1,085 lb-ft of torque, with transmission changes to match the increased output. The 2022 Ford 6.7-liter Power Stroke V8 diesel, by comparison, delivers 475 horsepower and 1,050 lb-ft of torque. Finally, the Ram HD’s 6.7-liter Cummins I6 diesel engine produces 420 horsepower and 1,075 lb-ft of torque, which is a class-leading figure.