This system allows the engine fan to idle at a very low speed 250-300 rpm. A one piece rear main seal, similar to the design, seals to the outside of the 100 mm o. It produced 240 horsepower at 4,800 rpm and 300 foot-pounds of torque at 3,200 rpm. Typical Mopar 3-groove, flash-chromed stems, hardened tips, and a length of 4. For the latest version, the compression ratio was increased to 9.
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. With the intake splayed at 13 degrees, the 64cc combustion chamber is approximately hemispherical in shape. The company installed the 4. . The head bolt pattern is the same for each cylinder and almost perfectly square at 4.
These are truck engines, after all: 0. This is an emissions and torque motor, remember. The 2003 models continued the redesigned model introduced the previous year. Small bores are easier to clean up for emissions. For model-year 2008, Chrysler adapted lessons from the to the 4. A new, normally-open valve lash adjuster system smoothed idling; and electronic throttle control was added to help stability control.
Fasteners are hardened M9 capscrews threaded directly into the rod, no nuts are used. This idler sprocket, in turn, is driven from the crank in typical pushrod practice timing set fashion. A super quality 3 layer laminated stainless steel gasket seals the deal. They are hollow steel tubes with the individual lobes, of powdered metal, sinter-bonded in place. This is obviously to improve flow and reduce friction. The block is made of cast iron and the heads are an aluminum alloy.
It was used in Dodge, Jeep and Chrysler vehicles, including the Chrysler Aspen; Dodge Dakota, Ram, Durango and Nitro; and Jeep Grand Cherokee, Liberty and Commander; and Mitsubishi Raider. Then the caps are literally cracked off, guillotined if you will, resulting in an absolutely perfect mating surface that almost lock together, preventing cap walk. The camshafts themselves are radical - although not in lift or duration. First, this engine has coil-on-plug ignition. The final version of the 4.
Speaking of bores, the roundness is held to a maximum of 0. As in all production small blocks, only the upper half of the mains are grooved. In fact, the cams, being hollow, are used to bring oil to the intake lobes, which have oiling holes. Bucking the current trend, the oil ring tension is rather high 12 lbs allowing good oil control even in high-mileage engines. The new, block mounted pump has a 75 psi relief valve, and a displacement of around one cubic inch per revolution.
The engine was still made at Mack Avenue Detroit. In 2003, Dodge continued production of the third generation of the Ram 1500, a successful line of half-ton trucks that the company had first manufactured in 1994. This article covers the 1999-2007 version. The 2008 redesign had two spark plugs per cylinder, a 9. Heat shield over them is super high-tech - aluminum core with stainless on each side. The engine displacement is 4. The oil pan is stamped steel, includes a windage tray integral with the pan gasket and has a capacity of 5 quarts plus one in the filter.
The bore by stroke is 3. Basic bore size is 3. Standard features on any body style with the 4. Ram 1500s with the 4. The compression ratio is 9. Buyers were able to upgrade this base model to the 4.
Towing and hauling capacities depended on the bed length and drive configuration. To improve fuel economy, the new engine features a patented hybrid cooling fan system that combines in-line electric and engine-driven fans. In fact, the spec for the 95th percentile customer is 150,000 mile useful life. If that sounds small, remember that a medium sized Holley 4-barrel has typically bores of 1. But the valve actuation - that is something else again. In this process, first used by Chrysler in the 2.
The engine valve system is chain driven and uses a single overhead camshaft design with two valves per cylinder, totaling 16 valves. The new 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. Head bolts are 11mm, but the meat is there for a future upgrade to a performance version 12mm. Carrying on a performance small-block tradition begun with the 1968 340, all bearings are bi-metal Federal Mogul aluminum alloy. The small bore helped reduce overall length of the engine. The next generation of the 4. The fuel injection system uses a sequential, multi-port electronic injection design.