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Time for Another Cummins Prototype (What should I do?)


Cummins Preference  

51 members have voted

  1. 1. Which Engine Do you Prefer

    • 12V 5.9L Cummins 6BT
    • 24V 5.9L Cummins 6BT
    • 6.7L Cummins ISB


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Well, I built one of these about 4 years back and sent it off to be resin cast by Alan of Ma's Resin. Unfortunately, last I heard, it was in the mail. That was 5 months ago and I haven't seen the engine or heard from him yet. So, I decided the easiest thing would be to build another. The only reason I haven't been real frustrated with the previous one is because I have been too busy with school to think about it. However, I was just talking to a classmate of mine, and it turns out that he builds models too. He got me excited about setting some time aside to build some more, and I decided that I would start with another cummins.

I have a couple of questions, though. There are three options. I was thinking I would build a 24V 5.9L Cummins 6BT. However, I could do a 12V or the new 6.7 if those are preferred.

Please let me know your preference.

Any help with dimensions from anyone who has a cummins would be great. That kind of info isn't real easy to find on the internet. Hopefully I will get this thing finished in a couple months and I can then look at getting another, more reliable resin caster.

Edited by stewart
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I have about three different vehicles I have planned on putting one into. I hope to get this one cast in a more timely fashion than the last one. I started drawing up the main block in SolidWorks today. Only took about 5 hours to get it mostly completed. One reason is because I'm still new to the program.

After I finish the block, I am going to try to get it 3D printed. The college I go to has a printer on hand and it is open to public use, so I can get it done for free. If it looks good, I will build a version myself, because the printers are pretty rough in texture. If I can, I might just clean up the printed version for casting.

I'll try to get some screen shots of the block and post them up later on.

STewart

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Well, I don't have any pics of the 3D model yet, but I put a little more work on it today and I should have it 3D printed by Friday. I have also made progress on my own styrene prototype and I do have pictures of that.

SAM_0824_zpsbc230ba9.jpg

SAM_0825_zpsa1fbffda.jpg

Using a razor saw and file to square up an engine block doesn't usually create a nice square block. I have a dremel router attachment, so I screwed it to a piece of 1/4" plexiglass and made a stand. It works very well.

STewart

SAM_0820_zps10e91821.jpg

467e5aa0-81d9-4d08-892b-8dea62335312_zps

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I tanked the 3D model because the printer only does tolerances of .020" and I need a tolerance of .005". I'm keeping the model in case I have opportunity to make it in 3D, but for now, I'm just working on the scratchbuilt styrene model.


STewart

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Working on it :) I posted what I have right now, minus oil pan, on shapeways.com. You can go here and get one printed for anywhere from $10, to $35. Be aware that the smallest tolerance on this is about 1.5mm, so even their best printing might not cut it.

I am planning on making and oil pain and then cutting the block apart and making a more printer-friendly version.

STewart

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Well, if you are really interested and willing to spend $40 to $50 on an engine, I have made 3D drawings of the whole thing that you can get printed from shapeways. The tolerances they advertise would be enough, based on which material you want to buy. The best detail is frosted Ultra-Detail and getting the engine printed in that is about $50 shipped.

I made the block in one piece and you can print that (doesn't have the oil pan) or you can use the halves and oil pan and valve cover. I decided to split the engine up that way because I thought it would be easier to get better detail from it. For some reason they uploaded in a vertical orientation, but they would print laying down.

As far as eta for completion and casting, it will be a few months. Alan told me he's almost done, and hopefully I can start getting him to make them. However, if I can finish this one in the next month, I will try to find someone who can do good castings quickly. If you have any suggestions, please let me know.

STewart

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  • 4 weeks later...

Well, I had a great Master pretty much complete and I was getting a mold ready to go when I somehow lost the mold and master :wacko:

Therefore, this project is on hold for a little while as I will have to make another master or find the old one.

STewart

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  • 4 months later...
  • 2 months later...

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