1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

1st gen upgrade help!!!

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Old Oct 1, 2014 | 09:50 PM
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Ve
 
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Old Oct 1, 2014 | 09:58 PM
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Power screw
 
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Old Oct 1, 2014 | 09:59 PM
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Old Oct 1, 2014 | 10:00 PM
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Under the top
 
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Old Oct 2, 2014 | 12:21 AM
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Everything looks fine to me have you gotten a fuel pin or you running stock and are you Manuel or auto just wondering
 
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Old Oct 2, 2014 | 05:17 AM
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Stock fuel pin but I have rotated it to the steepest point. Defiantly saw an increase in power when I did this. Auto transmission.
 
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Old Oct 2, 2014 | 04:24 PM
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While you're at it, I have heard that advancing the timing can make quite a difference (in EGT's too)... Again those 13mm nuts are a misery to get to, I cut and welded an old box end wrench and was able to do it OK, I was told to rotate the top of the pump toward the engine as far as it'll let you, don't know what that works out to in degrees, but it sounds happy there. I'll keep an eye on this as my dad's truck is a 93 with an auto and he wants a little better response.
 
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Old Oct 2, 2014 | 04:39 PM
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so i got the spring all installed little power increase +5 pounds of boost at 24psi. egt are up to 1050 max it hard to get over 1000. still no extra fuel with the power screw maxed out. NO SMOKE... I did the timing bump, and yes those bolt are a pain i took a wrench and heated it up and put curve on it seemed to make it easier. But as for adding fuel i am stumped i have no idea what is different in my pump compared to other pumps.
 
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Old Oct 2, 2014 | 05:19 PM
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I don't think those pumps are as fussy as the P pumps, but have you checked to make sure your lift pump is keeping up?

Good EGT's at least..
 
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Old Oct 2, 2014 | 06:50 PM
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Im stumped with my 93 I dam near maxed my pump turned in my smoke screw to the point it was flat with the nut turned my fuel pin and had timing bump and lastly 3200gsk and I hazed at ideal then black when I stabbed it then cleared right up pushing 36 psi now I have dam near all the smoke gone with some special tunning and thats with my fuel pin and my 5x14 injectors I wish I would of gone 7x12 injectors to kill off all the smoke
 
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