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Tool Talk Discussion Forum

Cummins diesel pump

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KX

07-12-2004 19:55:12




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Does anyone know what type and model number the diesel pump would be on a 99 Dodge 3500 Cummins Turbo? It is the one that is short, has the six lines to inj out the back in a circle (not the inline 6 lines).

Also....advice on turning it up? do it? dont do it? how to do it? THANKS IN ADVANCE.




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Tom (OH)

07-16-2004 05:52:13




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 Re: Cummins diesel pump in reply to KX, 07-12-2004 19:55:12  
A couple of sites with all the info you want about turning up the electronic VP44, and what to watch out for.

Link
http://www.dieseltruckresource.com/



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kydavid

07-14-2004 13:58:08




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 Re: Cummins diesel pump in reply to KX, 07-12-2004 19:55:12  
Should be a VP44 Bosch, chip driven. 'IF' you decide to chip it up be sure to include an exhaust pyrometer. These engines are turned pretty hot already, not a lot of room without melting the guts of them. It should pull anything within 130% of GVWR at highway speed without any chip up. If it wont, check your waste gate on the turbo. If you need more power than that, get a bigger truck.



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KX

07-14-2004 14:23:23




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 Re: Re: Cummins diesel pump in reply to kydavid, 07-14-2004 13:58:08  
David,
How to check the wastegate? Also, I was looking at the lowest chip you can put in them, 65 hp gain and gutting the exhaust of catalytic conv and gutting the muffler. Would gutting the stock exhaust allow enough air flow to run cool with the 65 hp chip? You are right, I don't want to melt it down, but the exhaust systems they try to sell you are straight through 4" or 5" but they come out of the turbo at 3 1/2 then go to 4 after 2 feet. I dont see why my gutted stock ehaust wouldnt breathe enough. THANKS

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kydavid

07-15-2004 09:37:32




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 Re: Re: Re: Cummins diesel pump in reply to KX, 07-14-2004 14:23:23  
In theory, what I think you are saying is that opening up the exhaust would speed exhaust gas flow and reduce heat buildup from the engine? That's not the heat I'd worry about. While a pyrometer does measure exhaust temperature that is not why we use them. Exhaust temp is the best measure of piston temp. Remember the piston faces are only cooled by the movement of heat through the oil spray/splash on the bottom of the piston and then out through the oil cooler and the radiator and through the oil film on the walls to the block and then to the radiator. Where you get problems is heat buildup on the piston faces themselves. Increasing exhaust gas flow would help if exhaust build up/back pressure was the problem, it isnt. The problem is burning more fuel than the physical properties of heat transfer provide for within the engine allow. A pyrometer on the exhaust simply warns you this is happening. The new Cat engines use a steel face insert (2 piece piston) because it was physically impossible to dissipate the heat off the face before aluminum started to break down.

As far as checking the waste gate. I normally 'get' that done at a shop that does diesels. On the truck I normally drive mine sticks a little with some fuels. Pickup drops, lots more exhaust smoke on acceleration, lower fuel economy (acts just like a dirty air filter). Change to a different source and nothing happens different for a 1/2 tank or so the I'll be taking off and the whole back end of the truck disappears in a big cloud of black smoke. Then runs like new, cant hardly make it smoke. Change back and after about 5 tanks got to do it again. This is on an '01-24v with 145,000 miles. I've been down this road. Had a 96 Ford that was chipped at 30K. Only 110,000 on the chip and the top end was toast. Got twin to it and a 444e (same basic engine) {that are stock} that have over a million miles between the two and neither one's been opened.

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Davis In SC

07-12-2004 21:02:46




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 Re: Cummins diesel pump in reply to KX, 07-12-2004 19:55:12  
Most Likely a Bosch VP44..... Electronic



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Shane

07-12-2004 19:57:22




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 Re: Cummins diesel pump in reply to KX, 07-12-2004 19:55:12  
Most likely it is a Bosch pump and a '99 is most likely an electronic pump and you can't just turn it up like the older ones. Have to get a chip to reprogram the computer which controls the fuel delivery.



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