Hummer H1

The Hummer H1 was a civilian vehicle based on the M998 High Mobility Multipurpose Wheeled Vehicle (HMMWV), popularly known as the Humvee, which was created by AM General. The vehicle was produced from 1992 through 2006.

Originally released in the civilian market in 1992, the Hummer H1 owed its birth to the popularity of photos from Operation Desert Storm and the enthusiastic campaign from actor Arnold Schwarzenegger, who personally owns several variants of Hummer vehicles. GM announced that 2006 would be the last model year for the Hummer H1, with production winding down in June 2006 due to a new emission law for Diesel engine vehicles which takes effect in 2007.
Due to the requirement to meet EPA Tier 2 Bin 5 emissions standards, the cost involving recertification for a low volume civilian variant vehicle was not able to be justified. AM General currently has orders for an excess of 50,000 new HMMWVs to be produced between 2006-2009 for the United States Military. AM General also will continue to produce the H1, just not the Alpha. These vehicles will be sold through fleet sales.
It is rumored that the next H1 will most-likely bear a refined version of the prior 6.5 L Turbo Diesel engine, but that has not been confirmed. Selling the H1s through fleet sales will allow AM General to not be subjected to the new 2007 Tier 2 Bin 5 emission rules and regulations. AM General has sufficient fleet orders to produce 600-800 units per year right now. The fleet H1s will end up using the standard 6.5 L Turbo Diesel that has been commonplace in GM and commercial applications.

The Hummer H1 has three common variants: a convertible-like soft top, a four-door hard top pickup truck and a Wagon body version. Other less known variants include a two-door pickup truck and a four-door slantback. At this time, the convertible/soft top and the station wagon versions are the only ones available in the mass market. The two door and four door pickup versions are only available in fleet livery.

Currently, five engine types and three automatic transmission types can be found in Hummer H1s. The common engine/transmission combinations are:

• 6.2 L GM Diesel V8/GM TH400/3L80 3-speed

• 6.5 L GM Diesel V8/GM 4L80-E 4-speed

• 5.7 L Vortec 5700 gasoline V8 TBI/GM 4L80-E 4-speed

• 6.5 L turbo GM Diesel V8/GM 4L80-E 4-speed

• 6.6 L turbo Duramax LLY turbo Diesel/Allison 1000 5-speed (model year 2006)

The Hummer H1 shares some common driveline parts with its HMMWV brethren. Items like brakes, differentials, frame and major body panels (hood, tailgate and quarter panels) are identical between the HMMWV and the Hummer H1. All Hummer H1s and HMMWVs come off the same first stage assembly line, and then are separated midway to either become a military HMMWV or a civilian H1.
Hummer H1s are unique in the way they handle off road, and in their interior arrangement. Passenger and highway comfort are sacrificed for maximum mobility compared to civilian SUVs, with features much more radical than the original Jeep, though they do share a similarly cut simple grille opening. They are inherently very stable, thanks to their wide stance. They also can ford 30 inches (76 cm) of water, climb a 22-inch (56 cm) step, have a stock ground clearance of 16 inches (41 cm). This high clearance is made possible by tucking driveline components inside a channel in the central space between the left and right seats. They have high approach/departure angles of 72/37.5 degrees. Most H1s are equipped with a Central Tire Inflation System (CTIS), which enables the driver to increase or decrease the tire air pressure at will- since lower tire pressures are more suited for off road, and higher tire pressures are desirable on-road.
Hummer H1s have many unusual features. They use inboard brakes. They have geared hubs, allowing the drivetrain's half shafts to be up high for greater clearance. The radiator is up high, sloping back over the engine on a forward hinged hood. The air intake is mounted high, enabling fording waist-level water. Rather than using simple runflat tires, aluminum or rubber inserts are an optional feature for runflat ability. Chemical warfare resistant paint is available only on the military version.