Delivery Valve Holder Breakdown - Dodge Cummins Diesel Forum

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post #1 of 4 (permalink) Old 05-03-2010, 10:29 PM Thread Starter
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Delivery Valve Holder Breakdown

This is to show how a delivery valve holder operates.

All measurments are + or - .002"

Unmodified holder, looks like the opening is too small to push fuel through untill you separate the parts.



Holder on left split horizontally and parts pulled out. Holder on right everything is cut in half (missing spring on right).



Sorry, but I dont know all the "officail" names of these parts, so I just used 1-4.

Parts assembled.
The fuel is first pushed up through #4 which has an opening of .120". It then is pushed up onto #3. #3 has a small .025" hole that goes straight through. This is the hole that most look at and think all the fuel is pushed through this small opening. That is a false assumption. The fuel pushes up on #3 and lifts it up off its seat on #4. #3 then has three holes for the fuel to pass through that are each .075" in diameter. The fuel then passes through the rest of #3 including through the spring. #3 moves up and down in #2 which is essentially just a sleeve. Next the fuel is pushed throught #1 which has a .100" diameter. Lastly the fuel is pushed through the rest of the holder which also has a .100" diameter.

As you can see the biggest resriction is the .100" passage. This design provides plenty of flow and thus does not need to be drilled out or have larger holders machined out.



another angle



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post #2 of 4 (permalink) Old 05-04-2010, 09:52 AM
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Nice info, took me a minute to figure out how the extra holes of #3 helped, but I was looking at the assemble pictures wrong. But I agree no point in honing out the holder when the lines would be the restriction until you go to .120, which are useless in 99.99% of the Ppump trucks.

On edit...

I wonder though, if the flow is hampered (IDK if thats the word Im looking for though) by having to go up and around the "nozzle" on #3 and if opening that small .025 hole would help, so the fuel wouldnt be "hampered" or restricted have to go around that nozzle? Now I guess on that note, does "#3" always lift high enough were the fuel can always get to the .075 holes, Im guessing it does, due to nothing is really rpm related, and the cam opens it up all the way everytime.

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Last edited by bh10; 05-04-2010 at 09:59 AM. Reason: new thoughts
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post #3 of 4 (permalink) Old 05-04-2010, 03:30 PM
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Great pics. Where does the delivery valve go in relation to these other parts?

bh10----the area of the .100 hole is-.00785 sq in

the combined area of the 3 .075 holes is-.013246875 sq in

so the 3 holes combined are .005396875 sq in bigger than the .100 hole

hope this makes sense, doesn't seem like much but i'm sure it makes a difference

Jordan

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post #4 of 4 (permalink) Old 05-04-2010, 04:55 PM Thread Starter
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Quote:
Originally Posted by mopar or no car View Post
Great pics. Where does the delivery valve go in relation to these other parts?

bh10----the area of the .100 hole is-.00785 sq in

the combined area of the 3 .075 holes is-.013246875 sq in

so the 3 holes combined are .005396875 sq in bigger than the .100 hole

hope this makes sense, doesn't seem like much but i'm sure it makes a difference

Jordan
DV goes below the bottom spring in this pic.



Brandon is talking about pushing up on #3 could be a restriction.

It probably is a restriction but not enough to make much of a difference.
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