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  #11  
Old 01-31-2010, 03:28 PM
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Rep for the write up. I'm always amazed at how a simple solution(not necessarily easy) can accomplish so much. Thanks to Stacy for putting up the badge as well. All of Randy's posts show his knowledge, the badge makes it easier to know when you are getting a reputable source.
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  #12  
Old 01-31-2010, 10:36 PM
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Good one Randy. Rep for the info.

Like the new badge too. Stacy comes through once again.
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  #13  
Old 01-31-2010, 10:40 PM
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Woohoo! I don't have MDS!!!

Now that makes my day.
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  #14  
Old 01-31-2010, 10:53 PM
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Very nice write up Randy, thanks for the info and nice badge BTW!!!

- Cajun
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Old 02-02-2010, 09:19 PM
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Quote:
Originally Posted by Remerson228 View Post
2006 was the first model year for MDS in the Ram. The Mega Cab wasn't offered with MDS even though it's rated as a half ton truck.
No MDS on Mega Cabs just in '06 or '06-'09?
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  #16  
Old 05-27-2010, 04:03 PM
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I'm surprised they don't hold the valves open a bit (not enough to hit the piston) so that it doesn't rob power on both compression/decompression strokes. Ideas?
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Old 05-27-2010, 04:20 PM
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The idea behind this is that the same force that resists rotation of the crank on the up stroke will aid in rotation on the way down.
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Old 05-27-2010, 04:35 PM
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Thanks Randy, that makes sense. I'm sure "they" did plenty of R&D by now to see what works best. Prob. a wash on loss of hp to rotate, since 4 of them are disabled.

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Old 05-27-2010, 05:19 PM
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The 1500 MegaCab is really a 2500 with a "1" on the door instead of a "2". The HD trucks did not use MDS, thus the 1500 Mega did not either.

I read this somewhere recently about the MDS (multi displacement system) it sounds resonable
Heres how it works, when the valves for those particular cylinders are closed, the exhaust gas is still stuck in there from the previous ''burn'' (this is done on purpose).... as the ''non-working'' pistons move up they compress the exhaust gases, but since the valves are closed this creates something like an ''air spring''. When the exhaust gas is compressed during the piston’s upstroke, then push down on the piston during its downstroke. The compression and decompression of the trapped exhaust gasses have an equalizing effect – overall, there is virtually no extra load on the engine.
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  #20  
Old 05-27-2010, 11:05 PM
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Quote:
Originally Posted by Remerson228 View Post
.....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......
Does this mean there is a solenoid for each of the four cylinders so they can be deactivated 1 at a time....but in the same 2 rotation time line ?
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