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  • cummins diesel conversion on chevy truck

    I'm looking for information on a cummins 5.9 swap on a 90 chevy truck C2500 8 lug 8600 gross weight.
    1997 Chevy K1500 4x4 truck. 350Vortec

  • #2
    Re: cummins diesel conversion on chevy truck

    I got some pretty valuable information for you.... DONT DO IT! Its a waste of time and money. Cummins are not the reliable engine they are made out to be. you wil be frustrated daily with all the problems you will have. The only perks about them are relatively cheap power and fuel economy (assuming its a 12 valve your talking about getting) but if you dont treat it just right and i mean just right, you will have a have a huge paper weight of an engine on your hands.
    sigpic2004 chevy 1/2 ton crew cab z71. Rough Country 6 inch with 35 inch Dick Cepek Mud Countrys on 17 inch helos.

    77' k5 Blazer 4 inch rancho lift 4.10 gears 33 inch mud kings.

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    • #3
      Re: cummins diesel conversion on chevy truck

      I think I'm gonna stick with 454 vortec conversion and rebuild it with high torque parts.
      1997 Chevy K1500 4x4 truck. 350Vortec

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      • #4
        Re: cummins diesel conversion on chevy truck

        Originally posted by camvk91 View Post
        I got some pretty valuable information for you.... DONT DO IT! Its a waste of time and money. Cummins are not the reliable engine they are made out to be. you wil be frustrated daily with all the problems you will have. The only perks about them are relatively cheap power and fuel economy (assuming its a 12 valve your talking about getting) but if you dont treat it just right and i mean just right, you will have a have a huge paper weight of an engine on your hands.
        I don't know where you are getting your information from, but the Cummins engine is pretty much the most reliable Diesel engine available in light duty pickup trucks.

        Also, you can find some Cummins conversion information over on competitiondiesel.com, I'm not sure how much info they have about it, but there should be some.

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        • #5
          Re: cummins diesel conversion on chevy truck

          Yea a built up vortec 454 would be your best bet. Your gonna get suck mileage but you'll save in the long run since you won't be buying expensive parts monthly for the cummins
          sigpic2004 chevy 1/2 ton crew cab z71. Rough Country 6 inch with 35 inch Dick Cepek Mud Countrys on 17 inch helos.

          77' k5 Blazer 4 inch rancho lift 4.10 gears 33 inch mud kings.

          Comment


          • #6
            Re: cummins diesel conversion on chevy truck

            Originally posted by camvk91 View Post
            I got some pretty valuable information for you.... DONT DO IT! Its a waste of time and money. Cummins are not the reliable engine they are made out to be. you wil be frustrated daily with all the problems you will have. The only perks about them are relatively cheap power and fuel economy (assuming its a 12 valve your talking about getting) but if you dont treat it just right and i mean just right, you will have a have a huge paper weight of an engine on your hands.
            Originally posted by camvk91 View Post
            Yea a built up vortec 454 would be your best bet. Your gonna get suck mileage but you'll save in the long run since you won't be buying expensive parts monthly for the cummins



            I'm not sure where your getting your information, but it's very wrong. The older 12v cummins are what started the diesel revolution where people realized that they arn't slow, noisy, and just good for pure work. Also they are very durable and unpicky about maintenance in stock power form. It's hard to get a much better motor then a 12v in a pickup when it comes down to the basics. Sure the new CR motors with all the electronics are easier to get power out of, but they don't come any simpler and more durable then a 12v while still being able to make stupid power if you want.

            As far as swapping a cummins into a Chevy, a 12v is a good fit. It only needs fuel and air to run and power to the starter if your running a mechanical fuel shutoff. Search this site and others like competition diesel and you'll find all the information you'll ever need.
            Last edited by Mark13; 02-18-2010, 03:50 PM.

            2006 Chevy 2500HD
            Boss 9.2 Poly V plow

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            • #7
              Re: cummins diesel conversion on chevy truck

              Originally posted by camvk91 View Post
              Yea a built up vortec 454 would be your best bet. Your gonna get suck mileage but you'll save in the long run since you won't be buying expensive parts monthly for the cummins
              The 454 swap may be cheaper upfront cost (but doubt it, all depends on what you do to each of the engines or transmissions), but the Cummins will get greater mileage (which saves a lot of money compared to the 454) and the Cummins has less maintenance costs then a 454. Under normal circumstances all you need to do with a Cummins is change the oil and put fuel in it. Camvk91, I think you need to get your "facts" straight, because like I said earlier, the Cummins engine is pretty much the most reliable Diesel engine available in the light duty pickup trucks.
              Last edited by `Green Machine; 02-18-2010, 03:55 PM.

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              • #8
                Re: cummins diesel conversion on chevy truck

                Originally posted by Mark13 View Post



                I'm not sure where your getting your information, but it's very wrong. The older 12v cummins are what started the diesel revolution where people realized that they arn't slow, noisy, and just good for pure work. Also they are very durable and unpicky about maintenance in stock power form. It's hard to get a much better motor then a 12v in a pickup when it comes down to the basics. Sure the new CR motors with all the electronics are easier to get power out of, but they don't come any simpler and more durable then a 12v while still being able to make stupid power if you want.

                As far as swapping a cummins into a Chevy, a 12v is a good fit. It only needs fuel and air to run and power to the starter if your running a mechanical fuel shutoff. Search this site and others like competition diesel and you'll find all the information you'll ever need.
                Originally posted by `Green Machine View Post
                The 454 swap may be cheaper upfront cost (but doubt it, all depends on what you do to each of the engines or transmissions), but the Cummins will get greater mileage (which saves a lot of money compared to the 454) and the Cummins has less maintenance costs then a 454. Under normal circumstances all you need to do with a Cummins is change the oil and put fuel in it. Camvk91, I think you need to get your "facts" straight, because like I said earlier, the Cummins engine is pretty much the most reliable Diesel engine available in the light duty pickup trucks.

                Pretty much sums it up. Not many other engines in pickups will make it a million miles with only maintenance, fuel, and occasional minor repairs.
                1994 K1500 ECSB 6.5/4L80-E
                1987 V20 Suburban DRW 6.2/TH400. WIP.

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                • #9
                  Re: cummins diesel conversion on chevy truck

                  Whatever engine I go with will be one the steps to convert my to a 2wd truck pull contest.
                  1997 Chevy K1500 4x4 truck. 350Vortec

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                  • #10
                    Re: cummins diesel conversion on chevy truck

                    Umm I'm actually getting my information from real world experience not by reading what magazines say and what people claim on websites. Yea the cummins 12 valve is a pretty good light duty diesel engine but it is overrated due to lots of people jumping on the cummins bandwagon. As far as power, fuel economy, and design simplicity, you can't get any better but for reliability your better of getting a fuel injected big block.
                    sigpic2004 chevy 1/2 ton crew cab z71. Rough Country 6 inch with 35 inch Dick Cepek Mud Countrys on 17 inch helos.

                    77' k5 Blazer 4 inch rancho lift 4.10 gears 33 inch mud kings.

                    Comment


                    • #11
                      Re: cummins diesel conversion on chevy truck

                      You must have had real world experience with a bad truck(s). I know quite a few people with cummins powered trucks, all the way from higher milage 12v's to the new 6.7s and the motor is the best part of the whole dodge truck. Sure the 98.5-02 trucks with the VP44 IJ and possible 53 blocks were looked down upon but with an aftermarket lift pump and a fuel pressure guage your doing pretty good, and very few of the 53 blocks actually cracked, you only hear about the ones that broke, not the thousands of others that are perfectly fine. Even the 12v's had the KDP that was a downfall but its not to bad to fix. The 6.7 is an animal with good tuning and the emissions crap gone, and the CR 5.9 is very happy to see power mods. I won't go into dodge transmissions since that isn't what this is about.

                      And I still fail to see how a fuel injected big block is more reliable then a motor that takes only fuel and air to run. No computers, no wiring, no sensors, no spark, nothing. There's a reason that pump stations, generators, heavy equipment, light and medium duty trucks, etc were outfitted with a cummins (or other mechanically injected small diesel from proven companies). Its a very simple motor that takes abuse well and requires very little maintenance. How many pump stations, generators, heavy equipment, have you seen with a fuel injected big block in it? Sure you can get pickups and medium duty trucks with big block's in them all day long.

                      2006 Chevy 2500HD
                      Boss 9.2 Poly V plow

                      Comment


                      • #12
                        Re: cummins diesel conversion on chevy truck

                        Originally posted by camvk91 View Post
                        Umm I'm actually getting my information from real world experience not by reading what magazines say and what people claim on websites. Yea the cummins 12 valve is a pretty good light duty diesel engine but it is overrated due to lots of people jumping on the cummins bandwagon. As far as power, fuel economy, and design simplicity, you can't get any better but for reliability your better of getting a fuel injected big block.
                        There is a reason why people "jump on the Cummins bandwagon", people like simplicity and power. Those two usually do not go together well. But when you find it. People follow the trend.
                        Originally posted by Xander Berkeley
                        I'd better make hay while the sun shines.

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                        • #13
                          Re: cummins diesel conversion on chevy truck

                          i cant believe no one has said this yet but the 5.9 and 6.7 are MEDIUM DUTY motors in a LIGHT DUTY truck. it is a 500,000 mile motor, the only issue with them is being in a 50,000 mile truck from the factory

                          look here - http://www.dieselplace.com/forum/sho...d.php?t=279711
                          Last edited by 2005_Sierra; 02-19-2010, 01:34 PM. Reason: added link
                          2005 GMC Sierra 1500 RCLB 4WD

                          4.8L/auto

                          sigpic

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                          • #14
                            Re: cummins diesel conversion on chevy truck

                            Does anybody know anything on the hydro assist brake conversion? Someone recommended it with using the cummins engine.
                            1997 Chevy K1500 4x4 truck. 350Vortec

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                            • #15
                              Re: cummins diesel conversion on chevy truck

                              Start searching and reading man. I think your best bet would be to look at the diesel forums posted above.
                              Originally posted by Xander Berkeley
                              I'd better make hay while the sun shines.

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