Which is better, 12v or 24v - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
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#1 Old 05-04-2006, 02:31 PM
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Which is better, 12v or 24v

I've seen several post referencing 24v Cummins (1998 on ) versus the pre '98.5 12v Cummins. I understand the differences mechanically, but was wondering which is better, and why (longevity, performance, power, etc...)? I have driven a '99 Cummins hundreds of times, and always think it is an amazing truck. Just wondering if it is really better then the 12v trucks of a year earlier.

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#2 Old 05-04-2006, 09:58 PM
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The 12V's give better fuel mileage, but thats about all they do better. I had a 98 12V and it didn't have half the power my 2000 24V had.

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#3 Old 05-04-2006, 10:43 PM
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Mine is opposite, get better mileage with the 24v. Also much eisier to get more ower from, although the 12v seems to be able to handle more power.
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#4 Old 05-06-2006, 05:05 AM
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yup

I know im going to piss the 12V guys off but , Having owned both, the 12V is a gutless pig next to the 24V.


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#5 Old 05-07-2006, 12:21 PM
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The more valves the better. This is true with any internal combustion engine. Four smaller valves per cylinder will out flow two larger valves. Just add up the combined valve seat area for type of engine. The more valves the better as long as shrouding doesn't take place....but that comes down to design and valve placement.

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#6 Old 05-07-2006, 12:31 PM
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When I was researching them, 12 valves always seemed cheaper to bomb and got better mileage but then again 24v's start with alot more power to begin with.

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#7 Old 05-07-2006, 09:43 PM
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My opinion and from the research i've done is that the 24v is in no comparsion to the old 12v. I went to a Cummins shop ALL they work on is Cummin's engines mostly bigger trucks but not a single one said they would buy a 24v they basicly said they are garbage and won't last nearly as long, and cannot handle mods very well. My mom has a 94 3500 with 450,000 and it still runs flawlessly even though it's a deck truck and is ALWAYS loaded down and in the mud. When I buy my CTD unless it's below 100,000km it will be a 12v because I don't want to spend a massive amount of money on repairs, because it will be modded.

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#8 Old 05-08-2006, 06:18 AM
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You have to do twice as many mods on a 12V to come close to the HP you can get from a newer Common Rail 24V. And I will bet there is atleast twice as many 24V's on the road as there are 12V's. My opinion is the 24V is way more reliable than the 12V

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#9 Old 05-30-2006, 09:46 PM
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Quote:
Originally Posted by Ram3500Dually
You have to do twice as many mods on a 12V to come close to the HP you can get from a newer Common Rail 24V. And I will bet there is atleast twice as many 24V's on the road as there are 12V's. My opinion is the 24V is way more reliable than the 12V
Are you serious!!!!!!??????? ANY cummins shop knows that extreme horsepower can only be attained by the 12v.ALL winning sled pulling dodges are 12v -kent crowder,van haisley,brad ingram,bigbaddodge,mitchell,curt haisley.There are a few 24 valves but they almost all have been p pumped.A few common rails have started to show a little power,but nothing can deliver the fuel that a p pump will,not yet.And drag racers ,there are only a handful of 24 valve trucks that run 11's and many 12v that run low 10's.Horsepower?there are numerous 12v trucks with 1000hp plus,I havnt heard of a common rail over 850,and a isb over 800 without drugs.Hell I've heard of 1300 plus from some of scheids trucks.And as far as reliability goes,are you serious?The p pump is the most positively bulletproof injection pump there is!I've never heard anyone complain that it is junk.The vp44?I cant even begin to fathom how many have gone bad.The lift pumps on 24v are always causing problems.On the 12v they are near flawless and will support 800hp.They aren't so hot on the cr as I've heard too.I have both a 12 and a 24 valve and I've changed nothing on my 12v truck in the 80000 that I've had it,on the 24 valve,I've had to change the lp and relocate it already.Sorry to rant ,it's just that what your opinions are about reliability goes against everyone elses opinions about the 12vs 24.Look on an actual diesel forum like diesel truck resource and you will understand
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#10 Old 05-30-2006, 10:05 PM
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I believe he was talking about streetable HP, not all out show pulling. I have owned all three and would never go back to a 12V

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#11 Old 05-30-2006, 10:10 PM
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Each has there place
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#12 Old 05-30-2006, 10:10 PM
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Really,I see that you have had alot of cummins,you must of lost a kdp or something to make you despise 12v.Everyone I know praises them and theyve had both too.I do realize that a cr can make alot of power with a strong box,but you can mod the fuel plate for free in a p pump.
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#13 Old 05-30-2006, 10:18 PM
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My 98 12V couldn't get out of its own way on the street when it was stock. My 2000 was alot faster stock to get out into traffic. I never had either of them modded. They would both pull my 30 foot pull type trailer with no problem but empty they were dogs.

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#14 Old 06-02-2006, 04:20 PM
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I gotta go with the 12v. I was at the 4wheel drive jamboree in Lima, Ohio 2 Saturdays ago and all I saw was turned up 12v's. Sure there were some powerstrokes and a couple duramaxes, but the 12v's were by the far the best sounding and I'm willing to bet they were superior in hp and torque. And as far as the potential of the 12v to the 24v... c'mon, everybody knows that the p7100 is 10 times more reliable and can crank out waaaaay more power than the vp44. Sure, bone stock the 24v runs better, but that's to be expected; it's called technology! My 95 ctd runs great and I've only put an aftermarket air filter on and straight piped it from the turbo. I'll soon be adding a big fuel kit, 100 horse injectors, stacks, and turning up my pump.
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#15 Old 06-02-2006, 08:55 PM
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The 12v is one of the most reliable engines period. There are dodge trucks running around with 1,000,000+ miles. You got to keep in mind though, when the 12v was first put in the big dodge in 89, there were still class 7 and 8 trucks running this motor when hauling what was considered "light loads" Part of the motors reliabilty is the fact that there is no electronics. That means no $800 computer upgrade to get more fuel. Fuel is as easy as turning a screw or grinding a plate. BHAF + 4" Exhaust and a turbo upgrade will get yoou some power. Get some Lucas POD injectors and your probably looking at 400HP! Alot of the 12v need some HD exhaust valve springs to handle that much though. Transmission, get a good clutch.

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#16 Old 06-02-2006, 09:11 PM
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Dollar for dollar you will NEVER be able to make a 12V run anywhere near as fast as the Common Rails

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#17 Old 06-11-2006, 04:01 AM
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Ooooohh,there are some 12v gurus that would like to see this thread!!!
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#18 Old 06-11-2006, 04:08 AM
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Quote:
Originally Posted by knowplay
The more valves the better. This is true with any internal combustion engine. Four smaller valves per cylinder will out flow two larger valves. Just add up the combined valve seat area for type of engine. The more valves the better as long as shrouding doesn't take place....but that comes down to design and valve placement.
Nope!
Actually if you do some real research you would discover that even know the 24v head flows more in stock form than a 12v ,the 12v hogged out head will massively outflow the 24v one of the same nature.
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#19 Old 06-11-2006, 04:16 AM
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Quote:
Originally Posted by cumminandgoin
I gotta go with the 12v. I was at the 4wheel drive jamboree in Lima, Ohio 2 Saturdays ago and all I saw was turned up 12v's. Sure there were some powerstrokes and a couple duramaxes, but the 12v's were by the far the best sounding and I'm willing to bet they were superior in hp and torque. And as far as the potential of the 12v to the 24v... c'mon, everybody knows that the p7100 is 10 times more reliable and can crank out waaaaay more power than the vp44. Sure, bone stock the 24v runs better, but that's to be expected; it's called technology! My 95 ctd runs great and I've only put an aftermarket air filter on and straight piped it from the turbo. I'll soon be adding a big fuel kit, 100 horse injectors, stacks, and turning up my pump.
Right now 12v cummins is still king.I bet there will be a day when the cr will match,but not yet,not a chance.I doubt there is a 900hp cr yet and there are numerous 12v at that and a few near 1200.Youre right the 12v may sound a little quieter stock than the awesome sounding 24 ,but with a straight pipe or stacks nothing is louder than a modded 12v.Just watch some scheid pulling vids
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#20 Old 07-29-2006, 07:52 PM
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12v= 1 fuel plate 1 grinder = 400hp & 800 lbs torque... cost $0.00
1000000 miles = priceless
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