While the automatic transmission-equipped 6.4L/392 HEMI V8 engines use a Multi-Displacement System (MDS), manual transmission versions of this engine do not have MDS (similar to the 2009 to current 5.7L HEMI V8 engines).

Does the 6.4 Hemi have cylinder deactivation?

While cruising the 6.4 HEMI is able to shut down 4 of the 8 cylinders. It's a great way to use a larger engine to pump out more power while remaining efficient during lower power situations. However, it's still relatively new technology. The main issue with the 392 HEMI MDS seems to be solenoid failures.

How do I know if my Hemi has MDS?

To be 100% sure check the 8th digit of the vin. If it is D then no MDS. If it is 2 then your truck has MDS.

Which Hemi engines have MDS?

The modern Hemi was released with 5.7L, 6.1L, and 6.4L displacements, all of which featured MDS. The latest 6.4L version had a maximum power of 525 horsepower.

Does the 2018 Ram 2500 6.4 Hemi have MDS?

Premium Member. -All Ram 2500s and 3500s with the 6.4L truck Hemi do have MDS.

Discussing the 392 Hemi MDS System in my 2020 Dodge Challenger R/T Scat Pack 1320

35 related questions found

Is MDS bad for engine?

Is MDS bad for the engine? No, the MDS is not bad for your engine. The whole idea behind this system to actually to improve fuel efficiency. The only complaint about the MDS is that drivers can only use four cylinders instead of eight.

Does 2017 Ram have MDS?

The available engine is a 5.7-liter V8 HEMI® MDS VVT engine coupled with an 8-speed automatic 8HP70 transmission. This engine has a Multi-Displacement System (MDS) with Fuel Saver Technology.

What year Hemi has MDS?

Chrysler's Multi-Displacement System (MDS) is an automobile engine variable displacement technology. It debuted in 2006 on the 5.7 L modern Hemi V8.

How much fuel does MDS save?

The Chrysler Group Multi-Displacement System (MDS) is a fuel-saving cylinder deactivation technology that is here today — customers get the power and capability of the HEMI® V-8 that they desire with an improvement in fuel economy of up to 20 percent.

Does Hellcat have MDS?

It does not, despite early rumors, have MDS / cylinder shutoff. The Hellcat Hemi is hooked up to a manual transmission in Dodge Challenger, and an eight-speed automatic in Challenger and Charger; the 8HP90 can handle up to 663 lb-ft. Advances in superchargers could boost power even more - learn how.

Can you disable MDS on Hemi?

MDS is a "multi-displacement system" that deactivates a cylinder bank on the Chrysler's Hemi V8 engine to operate in four-cylinder mode for greater fuel efficiency. ... You can disable this MDS system through a variety of means; from software reprogramming to hardware modifications.

Does 2021 Ram have MDS?

5.7L HEMI^® V8 ENGINE

This 5.7L V8 also uses the VVT as well as a Multi-Displacement System (MDS) with Fuel Saver Technology.

Does a 2011 Ram 2500 have MDS?

No MDS for 2500 Hemi's (or 1500 Hemi Mega Cab's).

Is VVT and MDS the same?

At moderate speeds the valves operate at low lift, but when the driver calls for more power, the high valve-lift phase is activated. ... In V-8 models with the Hemi engine, VVT and variable valve lift are combined with Multi Displacement System (MDS) to achieve additional fuel efficiency.

Is 6.4 Hemi a big block?

The modern hemi is definitely a small block. The small block / big block is not determined by the factory displacement (for example, Chevy built a 400 cubic inch small block that had more displacement from the factory than the original 396 big block).

What speed does the MDS Hemi work?

Registered. It will kick in at 10-15 mph in 2nd (cruising speed) at light throttle and at approx 65mph.

How do you know when MDS is working?

There is no display to tell you MDS is active or not, it's all feel and sound. It is VERY easy to tell when it drops to 4 cylinders if you have a really loud exhaust, motor sounds completely different.

How does MDS work on a Hemi?

The MDS solenoids direct oil pressure to the lifters for each cylinder and that pressure pushes in locking pins that allow the lifters to 'collapse', so they no longer open the valves. The ECU also shuts off fuel and spark to the cylinders.

Does the 2005 Chrysler 300C have MDS?

Chrysler first introduced the system in 2005 specifically for their 5.7L Hemi Engine though they have since expanded the lineup of vehicles with MDS to include: Chrysler 300C (2005) Dodge Charger (2005) Dodge Magnum (2005)

Does 3.6 Pentastar have MDS?

Registered. This has come up several times and some people seem to be mistaken... the 3.6 does NOT have an MDS feature. There is no cylinder deactivation on the v6. MDS is found on automatic 5.7 and 6.4 only.

Do all Hemis have 16 spark plugs?

There are two spark plugs per cylinder in a HEMI V8 engine. So, when the plugs need replacing, there are 16 to change, not eight. Also, it should be noted that all HEMI V8 engines use coil-on-plug ignition systems. All except the 2004-2005 engines, that is.

Does a 2012 Ram 2500 have MDS?

The 2500 with the 5.7 doesn't have mds, the 6.4 will have mds in the 2500.

What does eco mean on 2015 Ram?

The eco light just means you're driving in a fuel efficient manner, and the light can be disabled in the Uconnect menu. It can be on or off if the truck is in 4 or 8 cylinder mode and is not tied to MDS function.

What does eco mean on RAM?

It just means you're driving economically. If you have a hemi, the 4 cylinders shut off when you use cruise control.