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Diesel engines, which is better: Ford, Dodge, Chevy



  • trucktrickstrucktricks Posts: 45
    I have heard that Ford will be going to the International 6.0 liter replacing the 7.3 liter.

    Jamesfletcher2: Is this what you mean when you say "Ford is dropping the International in 2004"

    Also a comment on Horsepower and Torque. It is Horsepower that is the measure for the ability to do work. Torque is a component of an engines ability to provide that horsepower. The other component is speed. So if you want to carry a load up a hill at a given MPH, this will require a fixed amount of Horsepower, not Torque.

    Another way to think of it is that it is possible to produce 500 lb-ft of torque from a 5 HP Briggs and Stratton engine by gearing the output down. But installing that package in you pickup to pull your 5th wheel up the Grapevine is not going to work very well.
  • mullins87mullins87 Posts: 959
    Torque is the measure by which work is done, not horsepower. If that were the case, why do trucks have high torque, low horsepower engines while sports cars have low torque, high horsepower engines? You are right that horsepower is a function of torque at a given rpm and that horsepower is required to do a job quickly. Your example of the 5hp B&S to pull a 5th wheel is correct. With enough gear reduction, that engine will put a tremendous amount of torque to the ground, it just won't do it very quickly. You will get to the top, but at less than 1 mph.
  • lariat1lariat1 Posts: 461
    in here many times. "Torque gets the load moving, HP keeps the load moving."
    As this pertains to trucks and towing. Seeing that there is a lot of wind resistance with a truck and even more when towing, the truck acts like it is always trying to accelerate and that is why it is more important to have torque than HP in a truck.
  • hunter98hunter98 Posts: 273

    There is a fixed relationship,
    Horsepower will equal torque always at 5252 RPM, and above this point horsepower will always be greater than the torque.

    The reason that we want as much torque as possible for a pulling truck is that the higher the torque number at pulling RPM, the more available horsepower to pull with. This is why the Duramax has more pulling power at 2000 RPMs than the 8100. This is even though the HP is 340 on the big block, and only 300 on the Duramax. THe 8100 will outpull the Duramax if both are at peak HP levels, but this depends on the gearing situation. IT IS VERY DESIRABLE TO PULL AT RPMS AROUND 1800-2000 RATHER THAN 3000-3500 FOR THE FUEL ECONOMY, NOISE, AND LONGEVITY ISSUES.


    ON ANOTHER NOTE, ALL OF OUR FARM TRACTORS, COMBINES, ECT ARE RATED BY HORSEPOWER AT RATED LOAD RPM, SUCH AS 235 HORSEPOWER AT 2000 RPMS, that engine has a max governed RPM of 2200 rpms, and is 95% of the time operated at full throttle, with the load pulling the RPMS down to 1900-2100 RPMs, under no load, 2200 RPMs.


    Hope you all get it now!
  • adunkeradunker Posts: 32
    Let me start out by stating that I am currently and Internet Manager at a Chevy dealership in Texas. I have worked for Dodge dealerships also.
    The base of almost all discussions goes back to the "tried and true" diesel engines. Dodge has the Cummins engine which has made a few improvements in the last few years, however the other components the engine is coupled with will not last with the engine. My friend works right next door at a Dodge dealership and has replaced many transmissions in these trucks due to not being able to keep up with the diesel. Also, this is a great engine, but why in the next year or so is DaimlerChrysler going to give a choice between Cummins and Mercedes Diesel?
    Ford with it's PowerStroke is a good choice for low mileage uses. By low mileage I am insinuating 150K or less. After this threshold, the truck loses its characteristics that made it such a good truck. Diesels are supposed to be built rugged enough to last 200-even500K miles. Seen the resale value of an older model Powerstroke lately? It isn't pretty. Also, this engine brings to the table relatively close the same numbers that Chevy and Dodge offers. The problem with this is the abundance of 7.3 liters. As well as higher maintenance costs, you also have poor gas mileage to add to it.
    Now to the Chevy. This Duramax is new to the Chevy, but it is built by Isuzu. If you didn't know, Isuzu has been building diesel engines longer than any other auto manufacturer. Are far as "tried and true," Chevy takes pride in the fact that they test out everything thoroughly before producing it for the public. This in turn reduces the number of problems in the long run. Am I saying that Chevy has no problems? No, but the chances of having a major problem with your new Chevy truck is very slim. How do you think Chevy can keep its slogan "Like A Rock" for as long as it has with no hassles. If you haven't driven a Chevy, just go test drive one. The ride quality in this Diesel truck will greatly impress you.
  • kg11kg11 Posts: 530
    Nice try Adam."My friend works right next door at a Dodge dealership and has replaced many transmissions in these trucks..."
    My Sierra 2500HD has it's THIRD Allison in it.

    "why in the next year or sois DaimlerChrysler going to give a choice between Cummins and Mercedes Diasel?"

    "Chevy takes pride in the fact that they test out everything thoroughly before producing it for the public"
    TWO transmissions were taken out of my ONE truck and returned to Allison "for research"because of an electronic programming problem.
    AND if you want to keep selling Chevys you can't say anything about why GM is STILL producing knocking engines after THREE YEARS.

  • 26psiboost26psiboost Posts: 15
    Judging by the literally thousands and thousands of posts in Town Hall regarding Silverado, Engine Knock, Allison, and Duramax problems I would say GM needs to work a little harder at the proving grounds before releasing a new vehicle. GM has had some better ideas lately than the competition, but it hasn't launched anything new in the last 5 years that hasn't been a POS in its first two years of infancy ranging from the vette to the Tahoe's and the Town Hall and Consumer Reports confirms it.

    Just because GM outsourced a motor and trans from reputable manufacturers (finally) doesn't prove any long term quality or re-sale issues for it's new HD. Neither this motor nor this trans are identical to anything that has been on the road for years as they were specifically made for GM.

    If these trucks are so good and somebody really would like one I suggest contacting dealers in Georgia where there are huge rebates on new 2001 Duramax's that dealers still have in inventory. Good luck finding an ad for a new '01 Ford or Dodge diesel.

    As far as re-sale goes my recently traded '99.5 F-250 SC SD PSD with 90K miles depreciated only $8000 from what I paid for it new on trade and that was with X-plan on the new '02 PSD CC truck so they couldn't make up for the difference on the new vehicle as its price was out of their control. What else seats six, will pull virtually anything and only depreciates roughly 8 cents per mile with very high mileage in a relatively short period of time?

    I'm also curious to see what the thick head gasket between iron block and aluminum head on the Duramax is going to do around 100-125K, but only time will tell.

    As a matter of fact go back to you little cubicle and post again when the 1 millionth Duramax is placed in a HD. Ford placed its 1 millionth Powerstroke in the Turtle V Expedition F-550 on August 30, 1999 and they most likely will reach the second million mark by the end of this model ('02) year.
  • quadrunner500quadrunner500 Posts: 2,728
    I don't think you can find 30 complaints in Town Hall about the Duramax diesel, but I digress.

    What I really wanted to interject, was the subject of torque and horsepower. In the simplest terms, torque is work, but horsepower is the time rate of doing work.

    If you followed that, torque is Force times Radius, Horsepower is Torque times Rpm.
  • mullins87mullins87 Posts: 959
    The reason everything is rating in HP is because that is the number most of us understand. If HP were king, we would have 10k rpm screemers turning out 500 hp in our trucks and tractors, but they would only be producing 263ftlbs of torque. We all know that would never get the job done. Your example of the tractor producing 235hp @ 2k rpm; Do you have any idea how much torque that engine is producing @ 2k rpm???? Try 618ftlbs!!!! Couple that with the overall gearing, a huge amount of torque is being put to the ground.

    Being on the farm and working on equipment all the time, I assume you are familiar with a torque wrench and how it works. What does a torque wrench measure? How much force (work) is being applied to the nut/bolt. A dyno, the device used to measure an engines HP, works in much the same way as a torque wrench, only it uses a viscous fluid to measure forces applied. The engine attempts to turn the shaft of the dyno while the dyno attempts to shut the engine down by not letting the shaft be turned. This is where the torque of the engine is measured. Horsepower alone could never turn that shaft. Of course, you cannot have horsepower without some torque.

    Torque measures how much work can be done and horsepower measures how quickly it can be done. I apologize for ever responding to Rick, I'm afraid I may have started another discussion on a long since worn out subject.
  • hunter98hunter98 Posts: 273
    First off, the Duramax is great, have 13,000 miles on farm with mine without a lick of problems. I also know of quite a few others that have had no problems. "Although I know a guy whose neighbor works at a Chevy Dealership and they have replaced DOZENS of sets of heads and head gaskets" I WAS LAUGHING AS HE SAID THIS TO ME, HE DRIVES A POWERSTROKE, WHAT CAN I SAY.

    Anyways, on the torque, horsepower debate. Our tractors have 12, 16, 18, or say 24 gears to allow us to go the proper speed in the field. One tractor for example makes 220 Horsepower at 1900 RPMs, and another tractor makes the same horsepower at 2600 RPMs. They both will pull the same load, but have different torque curves and numbers. It is the producing of a given amount of horsepower at different RPMs, and using gearing to provide equal ground speed that allows the same amount of work to be done.

    Two engines of the same horsepower, one produces 600 ft lbs at 1500 RPMs, and the other produces 400 ft lbs at 1500 RPMs, the one with the 600 ft lbs, will pull 50% more than the other one at that given RPM, but both at peak HP, will pull equally.


  • lariat1lariat1 Posts: 461
    Basically if you had 1 gear Torque would be #1 and on the other side if you had an unlimited number of gears and RPM was not a consern HP would be #1. Last nigh I thought about it and I remembered something that helps explain torque vs Hp. Torque is Rotational force and Hp is straight line.
  • adunkeradunker Posts: 32
    KG11- Seems you got a problem truck. These types of trucks or cars aren't limited to the GM brand. All manufacturers of any type of product have a few that get out and have problems. Unfortunatly, people, like you, that end up with these products usually don't buy another one and spread around that they have a bad product.
    Oh, and Chrysler doesn't own Mercedes. Mercedes bailed Chrysler out when there business was down in the dumps. I worked for them when that merger took affect. I a sense, it hurt Mercedes more than it helped Chrysler because now Mercedes has to take care of all the problems.
    26PSIBOOST- Good luck finding huge sales on '01 Dodge Diesels? Our Ford and Dodge dealerships have their diesels marked down to close to $21,000 just to try to get rid of them. The problem with Dodge is that the new body style is hurting the heavy duty trucks. People would rather wait another year to get a new body style than get a new '01 and have the resale value drop after they redesign them.
    Your trade-in value is easy to make seem higher or lower than what it should be, even if you have a fixed price. Check out the real trade-in values through Edmund's or Kelley Blue Book. Don't be fooled by your obvious inexperience. Trust me, I was fooled once when I was younger. It won't happen again to me. But I also know the car business better now.
  • trucktrickstrucktricks Posts: 45
    Quadrunner500, you are close to being right on the money. But….

    Torque is really not work, it is rotational force. Or to say it another way, it is force acting at a distance (radius).

    Work is force acting through a distance (pushing on an object with 5 lbs. of force for a distance of 5 feet is 25 ft-lbs. of work).

    And Power is the rate of doing work (pushing that same object 5 feet in 1 sec is 25 ft-lbs/sec or .04545455 horsepower).

    And for those of you out there that are wondering why this is so important, it is because this does have relevance to owning and enjoying trucks. Trucks are about pulling, hauling, acceleration, torque, horsepower, work and cool stuff like that.

    On the Duramax, GM grossly underestimated the demand for this marvelous engine so they are capacity limited. This is the reason for the long waits. They could have sold 50% more if they had the production capacity. You can be assured that they are addressing this as we speak.
  • kg11kg11 Posts: 530
    My point was not that I got a problem truck ,rather that GM DID NOT "test thoroughly" before releasing this product.My truck WAS THE TEST VEHICLE.Two mechanically sound transmissions were removed from my truck because GM didn't know anything about them,and THAT'S WHAT PISSES ME OFF.
    I didn't say my truck is a P.O.S. but you must admit it wasn't ready for market when it was released 3 or 4 months late.

  • quadrunner500quadrunner500 Posts: 2,728
    Hold on!

    Force equals mass times acceleration.

    Work equals force times distance.

    Oops! That makes you right and me wrong. Thanks for correcting!
  • bigfurbigfur Posts: 649
    Im looking to buy a diesel with a six speed in it. I curently have a 97 Ram 2500 4X4 diesel, love the truck, hate the tranny (auto). Had it rebuilt at 69K and had a shift kit installed havent had any problems since, but i like the freedom of a manual. And please limit the responces between Dodge and Ford for two reasons. #1 GM is way to expensive. #2 Of all the looking i have done here in minnesota, i have yet to find a six speed in a GM.
  • mullins87mullins87 Posts: 959
    I have a '99 F-350 PSD with the 6-speed. I don't think I would like the auto with the diesel either. You won't win any drag races between stop lights, but then again, if that is what you are after, you wouldn't be looking at a big truck. I like not having to worry too much about tranny failures. I know things can and do break on manuals, but they don't seem to be as frequent. I, like yourself, like the total control a manual gives me.
  • catamcatam Posts: 331
    A couple of things to consider. First, Dodge's current manual tranny is a 5 speed, made by Mopar. They will offer a 6 speed in the new 03 trucks. Both chevy and Ford use the same 6 speed manual in their trucks, I can't remember who makes it for them right now.
    However, if you are ruling out the Chevy, and you want a 6 speed, I would go with the Ford over the new Dodge.
    This will be a new truck with many new parts. Historically this proves to provide some unreliable vehicles while the manufacturers work all the bugs out.
    Personally I believe the new Cummins will be a great reliable engine, but I would be concerned about the electronics controlling it and the rest of the truck.
    The PSD has proven itself, and with the manual tranny it is a great package.
    I agree wholeheartedly about the problems with autos.
  • mullins87mullins87 Posts: 959
    both use the ZF 6-speed tranny. It is a great unit, however I do have one complaint with it. It will growl rather loudly at off-idle engine speeds. This is normal and characteristic of a heavy-duty tranny. Upgrading to synthetic ATF such as Mobil One, Redline Oil, or Amsoil will help.

    So far I have 106+ on mine with no problems.
  • textruckrtextruckr Posts: 22
    Transmissions are made by the New Venture gear company. A joint venture between GM and (the then) Chrysler Corp. It is an NV-4500, which is still used in the base model heavy duty GM pickups too. It is an excellent unit and has proven itself over many miles. New Venture has been offering the NV-5600 six speed for almost two years now, and I thought it was a special order option available on the Dodge trucks from 2001 (but I could have heard wrong). The NV-4500 has been great in my '94 C-3500 Chevy Crewcab Dually. Seen a lot of miles under heavy hauling and other than the synchros starting to wear, it has been flawless. The light duty five speed (NV-3500) is also shared between GM and Daimler-Chrysler 1/2 ton trucks.
    The ZF is a good transmission too. My only complaint on the one in our '94 Ford F-350 Crewcab, SRW is that it just won't synchro-shift like the NV-4500. Of course the clutch is a lot lighter in the Ford so it evens out.

    Texas Truck - r
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