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  #1  
Old 02-23-2011, 12:18 AM
tbeaton tbeaton is offline
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Default mds vs cylinder deactivation?

so what the difference? alot of 2500's i'm looking at say cylinder deactivation in the descriptions. i thought the 2500's didn't have it? looking at 10's & 11's.
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Old 02-23-2011, 12:31 AM
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I am not aware that the 2500 and up trucks have MDS (AKA Cylinder deactivation) incorporated into the 5.7L Hemi.
I am also not aware of any diesel engine having a cylinder deactivation feature.

Where did you find information that claims these features in a HD Ram?
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Old 02-23-2011, 12:35 AM
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http://www.contemporarycdj.com/new/D...5b1a308a98.htm

look under tech specs. i have found they all say it.
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Old 02-23-2011, 12:45 AM
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I see it on their list, but am unable to verify it on any Dodge/Ram site. I wonder if either -
a) They don't know better
b) They used a tech spec 'template' from the 1500's and forgot to remove that part
c) Dodge/Ram doesn't know they have it on their trucks
d) I completely failed to see it on the Dodge/Ram site(s)

I guess it's possible that it's now offered in the HD Rams, but sincerely doubt it.
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Old 02-23-2011, 04:24 PM
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Default

ya i have no clue but i'm seeing it on alot of the 2500 descriptions.
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Old 02-23-2011, 04:30 PM
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Take one out for a test drive. That should clear thing's up. It would be nice to know
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Old 02-24-2011, 04:31 PM
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Default

salesman said thats a misprint. no mds on the 2500.
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Old 02-24-2011, 05:33 PM
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I also believe that it is a misprint

5.7-Liter Hemi(R), 90-Degree V8, VVT 16-Valve, OHV, SEFI Engine; Front Mounted With Horsepower Of 383@5600, Torque Of 400@4000, Cast Iron Block and Alloy Cylinder Heads
2009 - 2011 engines GEN 4
[edit] 2009 RevisionsChrysler has made various revisions to the 5.7 L for the 2009 model year. The first for all applications is what Chrysler calls Variable Camshaft Timing or VCT. VCT (Essentially Variable Valve Timing) uses an oil control valve which controls oil flow to a unique camshaft sprocket which contains a phasing device, which depending on the operation of the oil control valve either advances or retards camshaft timing.

Cylinder heads have been revised to increase flow. Though the intake manifold has also been changed on all applications, it is however model specific. Dodge Ram, non-Hybrid Electric Vehicle (HEV) Chrysler Aspens, and non-HEV Dodge Durango utilize an active intake manifold with a short runner valve to optimize torque and horsepower. At lower engine RPM the valve is closed, resulting in improved low-end torque from the longer runners. At higher engine RPM the valve is opened, diverting the incoming air into the center of the manifold. The shorter runners results in improved horsepower. Passenger cars, Jeep vehicles, and HEV Chrysler Aspen & HEV Dodge Durango do not use this manifold, these vehicles utilize a passive intake manifold, which does not have a short runner valve.

Six-speed manual transmission and all Heavy Duty truck applications will differ by not having the Multiple Displacement System (MDS). The new version of the 5.7L has five different camshaft profiles. All will have VCT.

Active intake with MDS
Active intake without MDS
Passive intake with MDS
Passive intake without MDS
HEV Application (modified version of passive intake with MDS)
2009 to present Power Numbers

300C: 360 hp (268 kW), 390 lbft (529 Nm)
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Challenger R/T 5 Speed Automatic: 372 hp (277 kW), 401 lbft (544 Nm)
Challenger R/T 6 Speed Manual: 375 hp (280 kW), 410 lbft (556 Nm)
Ram 1500 Truck: 390 hp (291 kW), 407 lbft (552 Nm)
Ram 2500/3500 Truck: 383 hp (286 kW), 404 lbft (548 Nm)
Jeep Grand Cherokee and Jeep Commander: 357 hp (266 kW), 389 lbft (527 Nm)
Chrysler Aspen and Dodge Durango non-HEV: 376 hp (280 kW), 401 lbft (544 Nm)
Chrysler Aspen and Dodge Durango HEV: 390 hp (291 kW), 390 lbft (529 Nm)
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Old 02-24-2011, 07:47 PM
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No MDS on 2500s... OR 1500 mega cabs (as far as I've seen).
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  #10  
Old 02-25-2011, 03:45 PM
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Nope. NO MDS on any of the 2500 and up trucks but they DO have VVT beginning in 2009.
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