12v vs 24v vs common rail 5.9 vs 6.7 - Dodge Cummins Diesel Forum
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post #1 of 18 (permalink) Old 04-04-2010, 07:48 PM Thread Starter
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12v vs 24v vs common rail 5.9 vs 6.7

what are all the pluses and minuses of these engines

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post #2 of 18 (permalink) Old 04-04-2010, 11:40 PM
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As for the common rails they make good stock power, get good gas mileage, dont have any DPF stuff and they are very reliable. the cons in my oppinion are the injectors ,lift pump, and they are not as easy to work on as a 12v.

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post #3 of 18 (permalink) Old 04-05-2010, 09:00 AM
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12vs are really bullet proof overall. The 24v have lift pump and injection pump issues, and the common rails have injector issues. But all are very easily fixed and can be a very reliable engine. Most of the problems stem from dodge skimping on stuff. Anyways I currently have a 12v and love it! Its a big 4x4 and gets very decent mileage for being a long bed 4x4. My next truck will either be 03-06 or depending on the aftermarket etc maybe a used 6.7l. All and all you cant go wrong with a cummins. But each new redesign stuff gets more complicated because of all the electronics.

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post #4 of 18 (permalink) Old 03-26-2011, 02:30 PM
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what is the difference in power to the different engines? ive heard from fellow classmates at Wyotech that the 12 valves are what you want if you want to build a torque monster. is that true??
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post #5 of 18 (permalink) Old 03-26-2011, 02:41 PM
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The pros are there all cummins

It depends because you can make easy hp out of a common rail but you can take a 24v and p pump it and make it a monster...same as a 12v...you have no electrical bs to deal with its just whats in front of you...Little more difficult though to be a competitor to a high hp CR obviously but anything is possible...Cummins has done one thing right and its been building their motors right since day 1 IMO. They give enough variety for all types of people and try to meet their needs. This world wouldnt be fun if we werent all a little different and put our hearts in to only one style truck

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post #6 of 18 (permalink) Old 03-26-2011, 03:01 PM
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CR's have twice the HP as 12V's stock....

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post #7 of 18 (permalink) Old 03-26-2011, 11:18 PM
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I'd say the biggest downside to any of these engines is the dodge wrapped around it. 5.9 CR's get my vote, injectors and crap stock lift pump seem to be the weakest links. Better mileage and less noise than 12V or 24V, no extra emissions crap like 6.7's.

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post #8 of 18 (permalink) Old 03-27-2011, 11:32 PM
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I have owned (in order) a 2003 5.9 CR with an auto that was 4x4, crew cab. Great truck no isssues.

1993 250 4x4 Extended cab built DTT auto, PODS, pump massage etc .... great truck no issues

I currently own a 1997 4x4 Longbed Extracab with more mods then I could list. Great truck, great mileage, no issues..... This one is a 5 speed (NV4500) and I love it.
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post #9 of 18 (permalink) Old 03-28-2011, 07:39 AM
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The engines have gotten more powerful over the years. If you need or want the power and aren't bothered by the decrease in gas mileage, then its a pro.
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post #10 of 18 (permalink) Old 03-28-2011, 09:18 AM
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Stock for stock, the 6.7 will out tow all of them ( we have 6 right now starting with a 98 12V) Doing the delets on it are a must though.
I would never own another 24V. Had a 99 and it was a giant pain with the VP44 issues and constantly worrying about the lift pump.
My brothers 06 will out run me in my 08 but he can't out tow me.My Moms 07 mega with the 5.9 has been a total POS!!


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post #11 of 18 (permalink) Old 03-29-2011, 01:48 PM
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USE THE SEARCH FUNCTION. There are fifty of these threads already in just the general discussion.

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post #12 of 18 (permalink) Old 03-29-2011, 10:57 PM
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It all depends on what you can spend or want to spend and what you enjoy. I like any and all cummins, but I also like noise so I got a 24v since they are the noiseiest so I am told, and I couldnt afford a CR, also I prefer the 2nd gen body. If you want reliabilty, I would buy a 12v because there is no electronics or epa crap to bother you. Just a motor and a tranny. The CR are pretty good for power IMO and like mentioned before are really good as stock. Personally I think the 6.7s are a joke, UNLESS released from the EPA's hard grip. Then it would be my first choice. I rode in an 09 auto with a BLACK MAXX, and that SOB had 4 balls. He had the 4 wheel in and the lockers locked and was doin burnouts.

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