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Wanna see a running SubCummins conversion?

Discussion in '1982-Present GM Diesel' started by BurbinOR, Jan 31, 2005.

  1. BurbinOR

    BurbinOR 3/4 ton status

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  2. eclipse

    eclipse 1/2 ton status

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    Awesome!!! inspiration for all of us. I have an 84 c20 (first project to make it a K20) and it has a dead 6.2 diesel which I was planning on putting in a 454, but I'm really leaning toward a cummins 12v! :D
     
  3. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    Kutos to him for going with a 24v motor. :D He did a great job under the hood...

    his...
    [​IMG]

    Mine...
    [​IMG]
     
  4. eclipse

    eclipse 1/2 ton status

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    Whats the biggest difference in doing a 24v swap instead of a 12v swap? I know you have computer controllers. And what would you do with them on a 24v swap?
     
  5. AgDieseler

    AgDieseler Certified Scrap Producer Premium Member GMOTM Winner

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    A 24v comes with an electronic VP44 Bosch IP, so if one were sticking with that, he would plan on an ECM install, too. A P pump conversion allows for the use of a mechanical Bosch P7100 IP which simplifies electrical stuff. Also, 24v heads already come with the much sought-after 60 lb valve springs to which many 12v owners convert. Flow isn't clearly superior as a 12v head flows very close to a 24v - ported or not.
     
  6. eclipse

    eclipse 1/2 ton status

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    Haha still learning diesels here, so I"m a little confused. So your saying that you can switch to a mechanical pump on a 24v and that will eliminate some computers? So would this a conversion to a chevy easier?


    "Also, 24v heads already come with the much sought-after 60 lb valve springs to which many 12v owners convert. Flow isn't clearly superior as a 12v head flows very close to a 24v - ported or not."

    So the 24v heads have more flow with the 60 pound springs?


    Sorry I'm such a newb on diesels :p:
     
  7. AgDieseler

    AgDieseler Certified Scrap Producer Premium Member GMOTM Winner

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    Any conversion that doesn't involve adapting 'puters to the truck is always simpler.

    The 60 lb valve springs allow for the use of a more aggresive cam profile. By themselves, they don't improve air flow to the cylinder.

    A 24v head is capable of flowing a greater volume of air than a 12v, but not by such a large amount that it offsets the extra effort required to adapt a P7100 to the motor package. Porting a 12v head, which is already setup for the mechanical pump, is a better hp/$ value than converting a 24v.
     
  8. BlueBlazer

    BlueBlazer 1/2 ton status

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    Actually the 60 lb springs are to keep the valves from floating when a governor spring change is done which results in higher engine speeds before defueling. They should be used with a stock cam as well.
     
  9. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    Oh wow. Marking for perusal/fantasy..... :D:D:D
     

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