Every so typically, a very particular engine is unveiled and subsequently positioned into manufacturing. Powerplants of this stature are fondly remembered by the bulk of shoppers for his or her comparatively hearty development, unsurpassed sturdiness, and noteworthy energy manufacturing. One engine that matches this invoice is Chrysler’s 5.7L V8.
Chrysler’s Hemi lineup, in a single particular person kind or one other, has served all kinds of autos over the years, increasing to embrace a famed 5.7L (345 cubic-inch) spinoff in 2003. This specific engine served as the motivator behind quite a few Dodge vehicles and SUVs, finally discovering its approach beneath the hood of a number of memorable Jeep fashions.
5.7L Hemi V8 History
For all intents and functions, Chrysler has championed the design of hemispherical engines for maybe longer than every other main automotive producer. In truth, the firm’s love affair with engines of this configuration dates again to the early post-WWII period, although the thought of the hemispherical combustion chamber itself initially surfaced some 30–40 years prior.
As talked about, “Hemi” engines are so-named for the hemispherical combustion chambers that they characteristic. This design permits for the top-center placement of every cylinder’s spark plug, whereas additionally making the most out of the outsized consumption and exhaust valves.
As a results of these traits, hemispherical engines are able to a extra environment friendly air consumption, in addition to exhaust fuel dissipation. The burn distance related to the engine’s air/gas combination can be successfully shortened, thereby permitting for extra unstable combustion.
Chrysler’s first technology of “Hemi” engines was launched in the early Nineteen Fifties, persevering with their manufacturing run for the higher a part of the decade. Second technology Hemi manufacturing launched in the mid-Sixties, working till stifled by the implementation of latest emissions requirements in the early Nineteen Seventies.
However, it was in the end a 5.9L V8 LA/Magnum powerplant, slightly than a Hemi, that preceded the 5.7L V8’s run. In truth, prior to the 5.7L V8’s launch, Chrysler’s Hemi household of engines had formally been out of manufacturing for roughly 30 years. Nonetheless, repetitive calls for added horsepower led to a resumption of Hemi manufacturing in 2003.
5.7L Hemi V8 Specs & Configurations
The 5.7L Hemi V8 served as a blank-slate design, deviating utterly from something in manufacturing at the time of its launch. The 5.7 Hemi encompasses a deep-skirted cast-iron cylinder block, fitted with a nodular-iron crankshaft. This crankshaft itself is held in place with four-bolt mains.
Attached to the 5.7L Hemi’s crankshaft is a set of powdered-metal cast connecting rods and light-weight aluminum pistons. Interestingly sufficient, every of the engine’s cylinder banks is about at a 90-degree angle from the others, separated internally by a beefy camshaft and pushed by a timing chain of a slightly outstanding size.
The 5.7L Hemi’s cylinder heads had been of an aluminum cross-flow design and had been engineered to be comparatively free-breathing. Interestingly sufficient, these cylinder heads housed two particular person spark plugs and two valves per cylinder. Beehive valve springs additionally got here normal, as did hydraulic curler lifters. Atop these heads resided a plastic consumption manifold, full with an digital throttle physique.
The 5.7L Hemi V8 was additionally provided with MDS (Multi-Displacement System) expertise, which allowed for the deactivation of up to 4 particular person cylinders at anyone given time during times of low demand. This resulted in a major enhance in gas economic system whereas minimizing emissions output.
In 2009, the 5.7L Hemi V8 underwent vital redevelopment. Such efforts noticed the introduction of a brand new engine block, crankshaft, connecting rods, and pistons. Additionally, variable valve timing (VVT) expertise was additionally built-in, as was an lively consumption in sure fashions.
5.7L Hemi V8 Specs Index
- Horsepower: 395 hp @ 5,600 rpm
- Torque: 410 lb.-ft @ 4,400 rpm
- Compression Ratio: 10.5:1
- Displacement: 347CI (5.7L)
- Cylinder Bore: 3.92” (99.49 mm)
- Stroke: 3.58” (90.88 mm)
5.7L Hemi V8 Additional Uses
Aside from its use beneath the hood of the Jeep Grand Cherokee and Jeep Commander, the 5.7L Hemi V8 has additionally served quite a few extra autos. Without query, the most well-known of those autos is the 1500/2500/3500 Dodge Ram. Other such autos embrace the Dodge Durango, Dodge Magnum R/T, Dodge Charger R/T, Dodge Challenger, Chrysler 300, and Chrysler Aspen.
A Legend In the Making
The 5.7L Hemi V8 continues to be in manufacturing right this moment, with little signal of getting into retirement in the foreseeable future. Because of this, we’re doubtless to see the engine carried out in quite a few extra tasks in the years to come.
However, no matter what the future holds, the 5.7L Hemi V8 is already properly on its approach to turning into a legendary powerplant in its personal proper. Equal elements highly effective and strong, the 5.7L Hemi V8 is a particular crowd-pleaser of epic proportions.