The GM 8.1L Vortec engine was the last of the GM series of big block engines. This V8 engine replaced the 7.4L Vortec as the high power option for the vehicles in which it to be offered.

The boring was maintained the very same for the 8.1L engine, but the stroke to be lengthened which listed the extra displacement.

Some other alters included brand-new firing order, re-designed entry ports, and a conversion come metric threads throughout the engine, i beg your pardon no doubt had actually a major impact to tools required at the manufacturing plants as well as for mechanics who work on this engine.

8.1L Vortec 8100 V8 Engine SpecsL18
Displacement (cu in / cc):496 / 8128
Horsepower:330 hp
4200 RPM
Torque:450 lb.-ft.
3200 RPM
Bore and Stroke (in / mm):4.25 x 4.37 / 107.9 x 111
Compression Ratio:9.1:1
Fuel Delivery:Sequential Fuel Injection
Ignition System:Coil-Near-Plug, Platinum-Tipped Spark Plugs, Low-Resistance Spark Plug Wires
Block Material:Cast Iron
Cylinder Head Material:Cast Iron
Emission Controls:3-way Catalytic Converter, Exhaust Gas Recirculation, confident Crankcase Ventilation, Evaporative collection System

The 8.1 together Vortec was available a variety of platforms for GMC and also Chevrolet. The Chevy version that used this engine were the Silverado, Suburban, Express, Avalanche, and Kodiak, while GMC available the engine in the Sierra and Yukon XL. Various other specialty versions had the Workhorse motorhomes, T98 armored vehicles, and the 26 foot U-haul truck.

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The best Gas Engine for Towing?

As mentioned, the 8.1L changed the 7.4L Vortec in 2001. The 8.1 L was then developed until 2009 as soon as it lastly gave method to the little block 6.0 liter engine.

This engine is no longer in manufacturing as the critical was developed in 2009. Although there are some documented concerns with this engine, it appears that most are really happy with the 8.1L.

Many of this engines have actually made a significant number that miles, however the main reason to obtain an engine choose this is for the power and towing capability. The capacity of this engine handle hefty loads, particularly in mix with one Allison transmission is one of the things that renders this engine therefore popular.

In fact, the main complaint is the gas mileage, which many state is in the 8-10 mpg range, yet that is to be expected with an 8.1 liter gasoline engine.

8.1 Vortec power Specs

The power and also torque of this engine varied widely escape on specific application, as is typical with every engines used throughout a variety of platforms. The greatest power rating to be 340 horsepower, got to at 4200 RPM, while the greatest peak torque ever reached to be 455 lb-ft, achieved at 3200 RPM.

The specific volume did differ slightly transparent the production of this engine, varying from 8.095 liters to 8.128 liters, or about 494 cubic inches, produced by slight alters to the cylinder head.

The displacement was accomplished with a bore of 4.25 inches, lugged over indigenous the 7.4 together engine, and also a stroke of 4.37 inches, an increase of 0.37 inch in comparison come the 7.4 L the it replaced.

Head and also Block Construction

This 8.1 l engine is made generally of iron, using both a actors iron block and also cylinder head.

This engine offered a traditional camshaft in the block v pushrods. There were 2 valves every cylinder, 1 intake and also 1 exhaust to give a complete of 16 valves because that this V8 engine.

This engine also used what was essentially a carryover electronic fuel injection device from the 7.4L.

The 8.1L Vortec to be the final huge block gas engine indigenous GM to date. This engine to be primarily produced for work-related purposes and was very popular among people who required that sort of power.

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The enormous size caused high fuel consumption, i beg your pardon was likely one of the crucial contributors come this engine being changed by the little block 6.0 liter.