Hey guys, crazy question. My cousin and I got into an arugment lastnight because he was trying to tell me a co-worker of his has a 2004 durango with a factory 427 hemi. This durango is unmodified, it was purchased brand new, and everything is stock. Have any of you every heard of a 427 hemi being put into durangos or rams? Thanks very much for you help.

 

Show your cousin any website (www.dodge.com, www.msn.com auto section) and there is the proof. Durangos as well as Rams were only offered the 3.7L V6, 4.7L V8, and the 5.7L V8 Hemi for gasoline engine choices. The Rams are slatted to receive a 6.1L Hemi in the next year or so to replace the V10 as a second gas engine in the 2500 and 3500.

 

First off, it's a 426 hemi. No they never were available in a Durango.

 

Your right Mopartodd, the hemi was a 426. That was also something I mentioned to my cousin, but he still didn't buy it. However, after doing some research on line, and pointing out this information, my cousin now doubts that the durango is packing a big block.

 

It sounds like your cousin actually meant to say 4.7L vice 427. Either way it is not a hemi.

 

Actually the 4.7L "MAGNUM" V-8 is almost a HEMI....

The only reason it isn't called a hemi is because the combustion chambers have a wall on one side that makes it look kind of like a flat tire. Other than that everything is in the same arangment. The valve springs are across from each other and the spark plug goes right down the middle.

redriderbob

 

does the 4.7 have 2 spark plugs per cylinder like the hemi does?

 

The 4.7L only has one plug per cylinder... here is some information on the 4.7L V-8...

As the first member of Chrysler's first new V-8 family since the 1960s, the 4.7 has more power, less weight, increased fuel efficiency, and lower emissions than the LA series 318 - a member of sole remaining V-8 family from the 1960s.

The 4.7 has, 235 horsepower (over 172 kW) and 300 lb.-ft. (400 Nm) of torque, slightly more power than the 318. It produces 30% less pollution, noise, vibration, and harshness. Fuel economy is 7% better with the four-speed automatic. The engine has more pulling power, faster initial acceleration, and three miles per gallon better economy.

Buddy Revell pointed out that the new engine is "almost" a Hemi - "the only reason it isn't called a hemi is because the combustion chambers have a wall on one side that makes it look kind of like a flat tire. Other than that everything is in the same arangment. The valve springs are across from each other and the spark plug goes right down the middle."

The 4.7 has a cast iron block and two cast aluminum cylinder heads with a single overhead camshaft per bank and two valves per cylinder. It displaces 4701 cm3 (287 cu in.). A relatively small bore of 3.66 inches (93 mm) helped reduce overall length of the engine, packaging it for the compact engine bay of the Grand Cherokee. The stroke is 3.4 inches (86.5 mm).

Breathing features include a tuned-length runner intake manifold, free-flowing intake and exhaust ports and fast-burn combustion chambers. Operating with a high 9.3:1 compression ratio, the engine still only requires regular-grade fuel.

Lightweight material applications and more efficient engine accessories such as the alternator, power steering pump and air conditioning compressor further bolster performance and economy. Aluminum cylinder heads, a hollow camshaft with sintered steel lobes, magnesium valve covers and a molded composite intake manifold contribute to an overall weight reduction of 54 pounds (24 kg) compared to the previous 5.2-liter engine.

Driveability is enhanced by variable fuel injection timing, sequential multi-port injection, a quick-sensing inlet-side positioned thermostat and coil-on-plug ignition, in which each individual spark plug has its own secondary ignition coil.

In order to improve fuel economy, the new features a patented hybrid cooling fan system that combines in-line electric and engine-driven fans. This system allows the engine fan to idle at a very low speed (250-300 rpm. vs. the typical 650-700 rpm.), decreasing noise and vibration at idle and low speeds. The design of the cooling system, with a high efficiency water pump and a secondary thermostat control, reduces power consumption by 12 percent (6 bhp/4.5 kW).

The coil-on-plug ignition system, two-stage chain cam drive with automatic tensioners, premium gaskets and cylinder head mounted fuel injectors are a few of the basic design features that provide for a greatly increased engine life. The engine is designed to operate 150,000 miles (240,000 km) under normal conditions without part replacement other than normal maintenance items. A automatic serpentine belt tensioner increases the average accessory belt life to 100,000 miles (160,000 km).

redriderbob

 

Bob, Your knowledge of the 4.7 leads me to believe you may know why Automobile magazine says the 5.7 is not really a hemi. They say the engine began development as a hemi but so many changes were made to it that what is now produced does not actually have hemispherical combustion chambers. Right, wrong, partially right, what? THNX!!!

 

i believe that the piece posted there is part of an article Jack.