Quote:
Originally Posted by nitrous Hummers never came in diesel or manual versionss |
There was no petrol Humvee !
The military HMMWV and its civilian derivative the H1 were powered only by diesel engines.
It had a 6.5 litre V8 Detroit diesel developing 160 bhp@3400 rpm and 393 Newton-metre of torque at 1700 rpm.
It was coupled to a Turbo-Hydramatic 400 4-speed automatic. The TH400 could handle 612 Newton-metres of engine torque!
Torque
Let me dwell a little on the torque of the Humvee!
The Torque converter gave a torque multiplication of 1.96:1
The 1st gear in the TH400 automatic gave a torque multiplication of 2.48:1,
Transfer case low-ratio further gave a torque multiplication of 2.72:1,
The differentials gave a torque multiplication of 2.73:1 and finally
the geared hubs gave a torque multiplication of 1.92:1
So this beast of a tiger, had an overall torque multiplication of
69.3:1 !!
Body
It has a light rust-proof aluminium body with a Kevlar-composite bonnet. The body rides on rugged frame-rails and cross members of high grade alloy steel that is hot dipped galvanized and epoxy-coated for additional corrosion protection.
The aluminum body panels are glued together with a high-tech bonding adhesive and riveted in addition.
39 cm of ground clearance beats every other vehicle in its class.
With the military deep-water fording kit, you could drive it through 5-feet of water.
It had steel underbody protection plates in case you drove over rocks.
It can climb a 2 foot high stone wall. Imagine doing a "U"-turn over the tallest imaginable stone divider as if it didn't exist!
Wheels
Run flat Tires -- The 12-bolt, 2-part split wheels had beadlocks and a solid rubber runflat (see my diagram). You could drive 50 km at 50 km/h on two punctured tires.
Central Tire Inflation System (From the dashboard, the Humvee can deflate its own tires to 12 psi for driving on loose sand and re-inflate its own tires back to 45-50 psi on reaching solid road),
The Torque-biasing axle differentials are good enough to handle a max. of 1,737 Newton-metres of torque.
In fact, the axle differentials are hidden high inside and above the chassis, tucked away from any debris (even shrapnel from a stray mine-blast). Besides the differential housings are firmly bolted to the chassis without suspension.
Geared Hubs ensure that the differentials do not lie on the wheel centre-axis. They increase the vehicle's ground clearance and multiply torque.
All four Kelsey-Hayes power disk brakes with 300 mm rotors, are again inboard-mounted at the differentials (not at the wheels).
The Humvee has 4-point independent and interchangeable suspension -- the double "A" arm & coil-spring suspension spares can be used at any of the four wheel positions. The vehicle can thus substantially save on unsprung weight. Since the diff housing does not move, each side of the suspension can flex independently.
Pussycats
The Hummer H2 (shall we call it kid Hummer?) was just a body modified Chevrolet Tahoe/GMC Yukon with a 6 litre petrol V8.
-- a housecat pretending to be a tiger.
The Hummer H3 or baby Hummer(H2's kitten?) is as conventional as the Chevrolet Colorado/GMC Canyon pickup truck, it is based on. It is powered by a 3.7 litre 5-cylinder in-line petrol engine, with a 5-speed manual gearbox or 4-speed automatic.
The H2 and H3 are just ordinary SUVs that are shaped like a "Humvee" to please the untrained eye.
The H4 will be even smaller (maybe 3.5 litre engine with a monocoque body like a car) -- a mouse pretending to be the housecat which pretends to be a tiger.
Ram