Engine features | Engine specifications | MDS (Multiple Displacement System) |
3.0-L CRD |
3.7-L V-6 |
4.7-L V-8 |
4.7-L V-8 II |
5.7-L V-8 HEMI |
6.1-L V-8 HEMI |
(5W-30) (5W-30) (5W-30) Standard resistor-type 3/4" reach, 5/8" Hex head Torque to 20 Ft. lbs.
“Fired in suppressor seal” spark plugs using a copper core ground electrode. MSRP: $3.30 ea. 0.40 in. gap 3/4" reach, 5/8" Hex head Torque to 20 Ft. lbs.
(NOTE: The 4.7L V–8 engine is equipped with copper core ground electrode spark plugs. They must be replaced with the same type/number spark plug as the original. If another spark plug is substituted, preignition will result.) Bosch Nickel Yttrium plugs (intake) MSRP: $0.00 ea. 0.40 in. gap (intake) ??" reach, 5/8" Hex head? Torque to 20 Ft. lbs.
CAUTION: This engine uses TWO DIFFERENT types of spark plugs. A total of 16 plugs is used. The plugs are mounted in two rows (banks). The upper row is used on the intake valve side of the cylinder head. The lower row is used on the exhaust valve side of the cylinder head. The upper
row uses Bosch Nickel Yttrium plugs. The lower row uses Bosch Iridium plugs. DO NOT INTERCHANGE THESE PLUGS.
Bearing Journal Diameter
Bearing Clearance
End Play (MAX)
Bearing Journal Diameter
Bearing Clearance
End Play
Bearing Journal Diameter
Bearing Clearance
End Play
End Play
Bearing Clearance
Taper (max.)
End Play
Bearing Clearance
Taper (max.)
End Play
Bearing Clearance
Taper (max.)
Bi-metal construction
Bi-metal construction
7.46
7.49 15.74 / 85.4 mph 15.46 / ? mph 15.93 / 84.3 mph
Acceptable: Premium is NOT recommended (Note: 5W-20 oil MUST be used for proper operation of MDS system) 0W-40 (API rated SL/CF full synthetic engine oil such as Mobile 1)
P/N SPRE14MCC4 Type: RE14MCC4 0.45 in. gap
(*NOTE: The 5.7L V-8 is equipped with torque critical tapered design spark plugs. Do not exceed 15 ft. lbs. torque.)
P/N SLZFR5C11G Type: LZFR5C11G4 0.43 in. gap
(*NOTE: The 5.7L Gen II V-8 is equipped with torque critical tapered design spark plugs. Do not exceed 15 ft. lbs. torque.)
P/N SPLZTR5A13 Type: LZTR5A13 0.50 in. gap
(*NOTE: The 6.1L V-8 is equipped with torque critical tapered design spark plugs. Do not exceed 15 ft. lbs. torque.)
Type
Type
End play
Bearing Clearance
Taper (max.)
Material
End play
Bearing Clearance
Taper (max.)
Material
VALVE SPRING NOTE:
Premium valve springs with external dampers enhance the valvetrain and enable higher engine speed operation to 6,400 rpm
Chrysler Group was the first to offer modern, large-volume vehicles in North America with cylinder deactivation - the HEMI-powered 2005 Chrysler 300C and Dodge Magnum R/T went on sale in the of spring 2004 with the Chrysler Group Multi-Displacement System, or MDS. Chrysler Group was also the first to offer cylinder deactivation in an SUV with the introduction of MDS in the 2005 HEMI-powered Jeep® Grand Cherokee. Chrysler Group is the first to offer MDS in a pickup truck - the 2006 Dodge Ram 1500.
The Chrysler Group MDS is standard equipment with the 5.7L HEMI on seven vehicles: the Chrysler 300C, Dodge Charger R/T, Durango, Magnum R/T, Ram 1500 and Jeep Grand Cherokee and Commander.
With the addition of MDS to HEMI-equipped Dodge Durango and Ram, MDS-equipped vehicles through the end of the 2007 model year will save more than 60 million gallons of fuel each year.
The Chrysler Group MDS (Multi-Displacement System) seamlessly alternates between smooth, high fuel economy four-cylinder mode when less power is needed, and V-8 mode when more power from the 5.7L HEMI® engine is in demand," said Eric Ridenour, Executive Vice President Product Development, Chrysler Group. "This optimizes fuel economy when V-8 power is not needed, without sacrificing vehicle performance.
The MDS was part of the engine's original design," said Bob Lee, Vice President Powertrain Product Team, Chrysler Group. "This resulted in a cylinder-deactivation system that is elegantly simple and completely integrated into the engine design. The benefits are fewer parts, maximum reliability and lower cost.
Some of the significant technologies enabling the Chrysler Group MDS are the speed of electronic controls, the sophistication of the algorithms controlling the systems and the use of Electronic Throttle Control. The HEMI will be able to transition from eight cylinders to four in 40 milliseconds (0.040 seconds).
The HEMI engine with MDS has completed over 6.5 million customer- equivalent miles through Chrysler Group's development and durability testing. It is covered by the 7-Year/70,000-mile Limited Powertrain warranty.
The system deactivates the valve lifters. This keeps the valves in four cylinders closed, and there is no combustion. In addition to stopping combustion, energy is not lost by pumping air through these cylinders. For proper operation, 5w-20 oil must be used in engines with the MDS feature. Failure to do so may result in improper operation of the Multiple Displacement System.
Customers will experience estimated fuel economy gains of up to 20 percent under various driving conditions, and a projected 10 percent aggregate improvement. Improved fuel economy is realized without any change in customer experience -- drivers will receive the benefit without changing their driving habits and without compromising style, comfort or convenience.
The Multiple Displacement System (MDS) provides cylinder deactivation during steady speed, low acceleration and shallow grade climbing conditions to increase fuel economy. Both four and eight cylinder configurations have even firing intervals providesmooth operation. Two cylinders on each bank are active when the engine is in four-cylinder mode – every other cylinder in the firing order. All of the cylinders that are deactivated have unique hydraulic valve lifters that collapse when deactivated to prevent the valves from opening. Engine oil pressure is used to activate and deactivate the valves. It is delivered through special oil passages drilled into the cylinder block. Solenoid valves control the flow. When activated, pressurized oil pushes a latching pin on each valve lifter, which then becomes a “lost motion” link. Its base follows the camshaft, but its top remains stationary, held in place against the pushrod by light spring pressure but unable to move because of the much higher force of the valve spring.
Deactivation occurs during the compression stroke of each cylinder, after air and fuel enter the cylinder. Ignition then occurs, but the combustion products remain trapped in the cylinder under high pressure, because the valves no longer open. No air enters or leaves. During subsequent piston strokes, this high-pressure gas is repeatedly compressed and expanded like an air spring, but fuel is not injected.
The Multi Displacement System selectively deactivates cylinders 1,4,6, and 7, to improve fuel economy. It has two modes of operation:
The main components of the Multi Displacement System are:
The MDS system is designed to operate at speeds from around 20 mph to 80 mph. Some owners have reported activation at speeds up towards 90 mph. As shown in the chart below, the duty cycle is more active at highway speeds and on level ground. Other parameters that owners have discovered is that the engine operating temperature must be at least 130 degrees and oil pressure above 45 psi. In addition, the transmission must be in 5th gear at speeds above 35-40 mph.
MDS "activation lights" have been added by some owners. This involves wiring up a small light and switch to the No. 4 cylinder MDS solenoid power wire at the PCM pin # 28. While some people can determine the point when MDS is engaged or disengaged by the sound of the exhaust (more notably on aftermarket exhaust systems), the light provides more exacting results as to when the MDS system is on or off.
Cylinder Deactivation
Cylinder Reactivation
Just a few simple tips can help owners of Chrysler Group engines with Multi-Displacement System (MDS) get the most fuel mileage possible from their 5.7L HEMI® V8 engine.
The customer does not need to drive in a certain way to realize a fuel economy improvement with MDS, but these driving habits can maximize their fuel savings with this technology.
General
Cylinder block
Pistons
Piston pins
Valve timing
Top speed
Curve charts
About MDS
Description
3.7-L V6 (2005-2010)
4.7-L V8 (2005-2007)
4.7-L V8 Gen II (2008-2010)
General
Air cleaner element / Intake system
Standard air intake system
Standard air intake system
Standard air intake system
Bore x stroke
93.0 mm (3.66 in.)
90.8mm (3.57 in.)93.0 mm (3.66 in.)
86.5mm (3.40 in.)93.0 mm (3.66 in.)
86.5mm (3.40 in.)
Coolant capacity
14.0 qt. (13.25-liter)
14.0 qt. (13.25-liter)
14.0 qt. (13.25-liter)
Compression Ratio
9.7:1
9.0:1
9.8:1
Displacement
3.7 Liters / 226 C.I.
4.7 Liters / 287 C.I.
4.7 Liters / 287 C.I.
Engine type
90° SOHC V-6
90° SOHC V-8
90° SOHC V-8
Engine speed, maximum
5800 RPM
6000 RPM
6000 RPM
Engine speed, tachometer redline
5300 RPM
Firing Order
1-6-5-4-3-2
1-8-4-3-6-5-7-2
1-8-4-3-6-5-7-2
Fuel requirement
Regular unleaded, 87 octane
Regular unleaded, 87 octane
Regular unleaded, 87 octane
E85 compatible
Injectors
flow = 22.5 lb/hr @ 49psi
Knock sensor(s)
Two (Stereo)
Two (Stereo)
Two (Stereo)
Lead Cylinder
# 1 Left Bank
# 1 Left Bank
# 1 Left Bank
Oil Capacity
5 Quarts
6 Quarts
6 Quarts
Oil pressure
At curb idle: 04 psi minimum
@3000 rpm: 25-110 psiAt curb idle: 04 psi minimum
@3000 rpm: 25 psiAt curb idle: 04 psi minimum
@3000 rpm: 25-110 psi
Power (SAE net)
211 BHP @ 5200 RPM
235 BHP @ 4800 RPM
305 BHP @ 5650 RPM
Spark plugs
Type: ZFR6F-11G (NGK)
OEM P/N SPZFR6F11G
MSRP: $3.30 ea.
0.43 in. gapType: RC12MCC4
OEM P/N SPRC12MCC4
(formerly 56028236AA)Type: FR8TE2 (intake)
Type: FR8T1332 (exhaust)
Bosch Iridium plugs (exhaust)
OEM P/N 5149050AB (intake side)
OEM P/N 5149888AA (exhaust side)
0.50 in. gap (exhaust)
Torque (SAE net)
235 LB-FT @ 4000 RPM
295 LB-FT @ 3200 RPM
334 LB-FT @ 3950 RPM
Valve system
Chain-driven SOHC, 12 valves and hydraulic end-pivot roller rockers
Chain-driven SOHC, 16 valves, hydraulic end-pivot roller rockers
Chain-driven SOHC, 16 valves, hydraulic end-pivot roller rockers
Valve lift (zero lash)
Intake 12.00 mm (0.472 in.)
Exhaust 12.00 mm (0.472 in.)Intake 11.25 mm (0.443 in.)
Exhaust 10.90 mm (0.4292 in.)Intake 11.25 mm (0.443 in.)
Exhaust 10.90 mm (0.4292 in.)
Valve springs
(intake and exhaust unless noted)7.30 coils (intake)
7.15 coils (exhaust)6.69 coils
4.28 mm wire diameter7.30 coils
4.60 mm x 3.67 mm wire diameter
Cylinder Block etc.
Camshaft
Bore Diameter
26.02-26.04 mm
(1.0245-1.0252 in.)
25.975-25.995 mm
(1.0227-1.0235 in.)
0.025-0.065 mm
(0.001-0.0026 in.)
.200 mm
(0.0079 in.)
Bore Diameter
26.02 - 26.04 mm
(1.0245 - 1.0252 in.)
25.975 - 25.995 mm
(1.0227 - 1.0235 in.)
0.025 - 0.065 mm
(0.001 - 0.0026 in.)
.075 - .200 mm
(0.003 - 0.0079 in.)
Bore Diameter
26.02 - 26.04 mm
(1.0245 - 1.0252 in.)
25.973 - 25.995 mm
(1.0227 - 1.0235 in.)
0.025 - 0.065 mm
(0.001 - 0.0026 in.)
.075 - .200 mm
(0.003 - 0.0079 in.)
Crankshaft
Out of Round
0.005 mm
(0.0002 in.)
0.052 - 0.282 mm
(0.0021 - 0.0112 in.)
0.006 - 0.044
(0.0002 - 0.0011 in.)
0.006 mm
(0.0004 in.)
Out of Round (max.)
0.005 mm
(0.0004 in.)
0.052 - 0.282 mm
(0.0021 - 0.0112 in.)
0.004 - 0.034 mm
(0.0002 - 0.0013 in.)
0.008 mm
(0.0004 in.)
Out of Round (max.)
0.005 mm
(0.0004 in.)
0.052 - 0.282 mm
(0.0021 - 0.0112 in.)
0.004 - 0.034 mm
(0.0002 - 0.0013 in.)
0.008 mm
(0.0004 in.)
Cylinder Block
Cast-iron block and bedplate
Aluminum alloy headsCast-iron block
Aluminum alloy headsCast-iron block
Aluminum alloy heads
Main bearings
Journal diameter
63.488 - 63.512 mm
(2.4996 - 2.5005 in.)
Journal diameter
63.488 - 63.512mm
(2.4996 - 2.5005 in.)
Journal diameter
63.488 - 63.512mm
(2.4996 - 2.5005 in.)
Pistons
Diameter
92.975 mm (3.6605 in.)
92.975 mm (3.6606 in.)
92.975 mm (3.6605 in.)
Material
Aluminum Alloy
Aluminum Alloy
Weight
365.0 grams (12.87 oz.)
367.5 grams (12.96 oz.)
366.0 grams (12.90 oz.)
Piston Pins
Clearance in Piston
0.006 - 0.015 mm
(0.0002 - 0.0005 in.)0.010 - 0.019 mm
(0.0004 - 0.0008 in.)0.010 - 0.019 mm
(0.0004 - 0.0008 in.)
Diameter
24.017 - 24.020 mm
0.9455 - 0.9456 in.)24.017 - 24.020 mm
(0.9455 - 0.09456 in.)24.013 - 24.016 mm
(0.9454 - 0.09455 in.)
Type
Pressed Fit
Pressed Fit
Valve Timing
Intake - Opens (ATDC)
4.4°
4.4°
Intake - Closes (ATDC)
240.1°
239.1°
239.1°
Intake - Duration
245.7°
243.5°
243.5°
Exhaust - Opens (BTDC)
241.5°
240.5°
240.5°
Exhaust - Closes (ATDC)
20.1°
13.2°
13.2°
Exhaust - Duration
261.6°
253.70°
253.70°
Valve Overlap
25.7°
17.6°
17.6°
Top speed
3.7-L V-6
4.7-L V-8
4.7-L V-8 Gen II
0-60 mph
7.2
(Car & Driver)
(Motor Trend)
(AMSI, 1999 WJ)
0-62 mph (0-100 km/h)
9.0
(DaimlerChrysler)
1/4 mile / speed
15.6 / 86.0 mph
(Car & Driver)
(Motor Trend)
(AMSI, 99 WJ)
(Private owner "Doanlaw", 99 WJ)
Top speed (w/ limiter)
114 mph
Top speed (w/o limiter)
124 mph
(DaimlerChrysler)
Curve charts
General
Cylinder block
Pistons
Piston pins
Valve timing
Top speed
About MDS
Description
3.0L CRD
5.7L V8 (2005-2008) Gen I
5.7L V8 (2009-2010) Gen II6.1L V8 HEMI
General
Air cleaner element / Intake system
Dry Filter with Turbocharger and Charge Air Cooler
Low restriction air intake system
Low restriction air intake system
Bore x stroke
83 mm(3.26 in.)
92.0mm (3.62 in.)99.5mm (3.92 in.)
90.9mm (3.58 in.)103mm (4.06 in.)
90.9mm (3.58 in.)
Coolant capacity
14.0 qt. (13.30-liters)
14.5 qt. (13.72-liters)
14.0 qt. (13.25-liters)
Compression Ratio
18.0:1
9.6:1
10.5:110.3:1
Displacement
3.0 Liters / 182 C.I.
5.7 Liters / 345 C.I.
6.1 Liters / 370 C.I.
Engine type
CRD
90° V-8 HEMI
90° V-8 HEMI
Engine speed, maximum
5800 RPM
6400 RPM
Engine speed, tachometer redline
Firing Order
1-4-2-5-3-6
1-8-4-3-6-5-7-2
1-8-4-3-6-5-7-2
Fuel requirement
Diesel
Mid-grade 89 octane
Regular grade, 87 octanePremium 91 octane (R+M)/2 recommended
Injectors
flow = 22.5 lb/hr @ 49psi
Knock sensor(s)
Two (Stereo)
Two (Stereo)
Lead Cylinder
# 1 Left Bank
# 1 Left Bank
# 1 Left Bank
Oil Capacity
10 quarts
7 Quarts
7 Quarts
Oil pressure
At curb idle: 16 psi
@3200 rpm: 52 psiAt curb idle: 04 psi minimum
@3000 rpm: 25-110 psiAt curb idle: 04 psi minimum
@3000 rpm: 25-110 psi
Power (SAE net)
215 BHP @ 4200 RPM
325-330 BHP @ 5000 RPM
357 BHP @ 5200 RPM420 BHP @ 6200 RPM
Spark plugs
MSRP: $3.25
1" reach, 5/8" Hex head
Torque to 12-14 Ft. Lbs.
MSRP: $0.00
1" reach, 5/8" Hex head
Torque to 12-14 Ft. Lbs.
MSRP: $0.00
1" reach, 5/8" Hex head
Torque to 12-14 Ft. Lbs.
Torque (SAE net)
376 LB-FT @ 1800 RPM
370-375 LB-FT @ 3500 RPM
389 LB-FT @ 4350 RPM420 LB-FT @ 4800 RPM
Weight, engine
474 Lbs. (215 Kg)
Cylinder Block etc.
Camshaft
Chain Driven Dual Overhead Camshafts
End play
.080 - 0.290mm
(0.0031 - 0.0114 in.)
Hollow Assembled
End play
.080 - 0.290mm
(0.0031 - 0.0114 in.)
Hollow Assembled
Crankshaft
Out of round
0.005 mm
(0.0002 in.)
0.052 - 0.282 mm
(0.002 - 0.011 in.)
0.020 - 0.060 mm
(mm 0.0007 - 0.0023 in.)
0.003 mm
(0.0001 in.)
Nodular iron
Out of round
0.005 mm
(0.0002 in.)
0.052 - 0.282 mm
(0.002 - 0.011 in.)
0.023 - 0.051 mm
(0.0009 - 0.002 in.)
0.003 mm
(0.0001 in.)
Nodular iron
Cylinder Block
Deep-skirt cast-iron block with cross-bolted main bearing caps
Aluminum alloy heads with hemispherical combustion chambers.Deep-skirt cast-iron block with cross-bolted main bearing caps
Aluminum alloy heads with hemispherical combustion chambers
Main bearings
Journal diameter
64.988 - 65.012 mm
(2.5585 - 2.5595 in.)
Journal diameter
64.988 - 65.012 mm
(2.5585 - 2.5595 in.)
Hydraulic tappets
Body diameter
21.387 - 21.405 mm
(0.8420 -0.8427 in.)21.387 - 21.405 mm
(0.8420 -0.8427 in.)
Clearance (to bore)
0.020 - 0.063 mm
(0.0007 - 0.0024 in.)
0.020 - 0.063 mm
(0.0008 - 0.0025 in.)0.020 - 0.063 mm
(0.0007 - 0.0024 in.)
Dry lash
3.0 mm at the valve
(0.1181 in. at the valve)3.0 mm at the valve
(0.1181 in. at the valve)
Pistons
Diameter
82.833 (82.839 mm)
Material
Aluminum Alloy
Aluminum Alloy
Weight
413 grams (14.56 oz.)
435 grams (15.34 oz.)
Piston Pins
Clearance in Piston
0.009 - 0.018 mm
(0.00035 - 0.0007 in.)0.006 - 0.015 mm
(0.00023 - 0.00059 in.)
Diameter
24.0 - 24.003 mm
(0.9448 - 0.9449 in.)25.0 - 25.003 mm
(0.9843 - 0.9844 in.)
Valves
Valve system
Pushrod-operated overhead valves, 16 valves, eight deactivating and eight conventional hydraulic lifters, all with roller followers.
Variable-valve Timing (VVT), pushrod-operated overhead valves, 16 valves, eight deactivating and eight conventional hydraulic lifters,
all with roller followers. Pushrod-operated overhead valves, 16 valves, eight conventional hydraulic lifters, all with roller followers. Intake valves feature hollow stems and 2 mm larger heads compared to the 5.7L engine, allowing more air flow.
Valve lift (zero lash)
Intake 12.00 mm (0.472 in.)
Exhaust 11.70 mm (0.460 in.)Intake 14.50 mm (0.571 in.)
Exhaust 14.00 mm (0.551 in.)
Valve springs
(intake and exhaust unless noted)
7.4 coils
5.39 × 4.52 mm wire diameter
7.95 coils
4.95 × 4.1 mm wire diameter
5.7L Hemi engines built after 1/17/2010 are equipped with a new “damper-less” valve spring design. The new springs are used without the lower spring damper/support on both intake and exhaust valves. The new spring comes with a new valve spring seat which should be replaced if converting 2009 or newer engine to the damper-less design.
These new valve springs CANNOT be used as replacement springs on the older model year (2003-2008) 5.7L Hemi engines. The new springs have a greater installed height and will cause reduced open and closed spring force. Early-built Eagle Hemi engines (1/17/2010 - 1/28/10) may have a yellow paint stripe on the springs, similar to the dampened older spring. The new damper-less spring is also 5mm taller than the old spring when measured in free length. Production springs after 1/28/10 should have a pink-to-light purple paint stripe.7.35 coils
5.65 × 4.51 mm wire diameter
Valve Timing
Intake - Opens (BTDC)
5.0°
21.7°15.0°
Intake - Closes (ATDC)
253.0°
255.0°268.0°
Intake - Duration
258°
269.3°283.0°
Exhaust - Opens (BTDC)
233.0°
236°251.0°
Exhaust - Closes (ATDC)
27.0°
32.0°35.0°
Exhaust - Duration
253.7°
269.0°286.0°
Valve Overlap
34.0°
39.5°50.0°
Top speed
3.0-L V-6
5.7-L V-8
6.1-L V-8 HEMI
0-60 mph
4.7 sec.
1/4 mile / speed
13.5 sec.
Top speed (w/ limiter)
165 mph
Top speed (w/o limiter)
165 mph
MDS components and operation
NOTE: Vehicles with the 5.7L Multiple Displacement System must use SAE 5W-20 oil. Failure to do so may result in improper operation of the Multiple Displacement System.
Maximizing MPG with MDS
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