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6.4: The big truck Hemi

2012 Jeep Grand Cherokee SRT8 Specifications and Capacities

SRT8 enginesThe 2012 Jeep Grand Cherokee SRT8 runs from 0-60 mph in 4.8 seconds, screams from 0-100-0 mph in the mid-16 second range, covers the quarter mile in the mid-13 second range, has a top speed of 160 mph, and brakes from 60-0 mph in 116 feet.

The engine has 16 pushrod-operated overhead valves, with sodium-filled exhaust valves and hollow stem intake valves; they are actuated by 16 conventional hydraulic lifters, all with roller tips. The fuel injection is sequential (each cylinder is uniquely controlled) and returnless (there is no return feed for excess fuel), and the engine has a Fuel Saver (cylinder cutoff) mode. The engine itself has a deep-skirt cast-iron block with cross-bolted main bearing caps, topped by aluminum alloy heads with “hemispherical style” combustion chambers.

Engine 

Bore x Stroke

4.09 x 3.72 (103.9 x 94.5) — 392 cubic inches, 6.424 liters

Compression Ratio

10.9:1

Power (est.) (SAE J2723)

470 hp (351 kW) at 6,000 rpm; 465 lb.-ft. (630 N•m) at 4,300 rpm

Max. Engine Speed

6,400 rpm (electronically limited)

Fuel and Oil

Premium 91 octane (R+M)/2 — recommended; 5W-40 synthetic oil

Mileage

12 mpg city, 18 mpg highway (EPA figures)

Assembly Plant

Saltillo Engine Plant, Saltillo, Mexico

Four wheel drive

Transfer Case

MP3010 Single-speed, electronic proportioning (full time 4WD)

Torque Split, Front/Rear

Variable - 50/50 Snow and 35/65 Sport and Track

Front Differential

Conventional

Ring Gear Diameter

7.7 (195)

Rear Axle

3.70:1 ZF Electronic Limited Slip Differential (ELSD)

Ring Gear Diameter

9 (230)

Gear Ratios

3.59, 2.19, 1.41, 1.00, 0.83; reverse, 3.16

Approach Angle, Degrees

18.45

Ramp Breakover Angle, Degrees

17.84

Departure Angle, Degrees

21.9

Minimum Ground Clearance

8.3 (210.8)

Other specs

Alternator

Standard 220-amp

Battery

Group 65 maintenance-free 750CCA

Drag Coefficient

.39

Aero CdA

12.2 (Cd x cross-sectional area)

Front/rear weight distribution54/46
Gross weight rating6,500 lb (2,948 kg)
Curb weight (with full fuel)5,150 lb (2,336 kg)
Payload1,350 lb (612 kg)

Standard Tires

P295/45ZR20 Pirelli Scorpion Verde – All-Season Performance (run flat)

Optional Tires

P295/45ZR20 Pirelli P-Zero – Three Season (run flat)

Axle ratio3.70
Max towing5,000 lb (2,269 kg)

Jeep Grand Cherokee at Allpar

ZJ, WJ (Pure Jeep)WK (Joint Development)WK2 (Current)



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GTX: hot, well-trimmed Plymouths Big list of concept cars 6.4: The big truck Hemi