Delivery valve body question - PeachParts Mercedes-Benz Forum

Olivier · #1 11-14-2010, 09:06 AM

Hello,
Inside the DV body there is a little restrictor that make the hole teeny.
What is the purpose of this?
Would removing it increase the flow?
Or should be "Do not Remove" at all...
Thank you.
Olivier

04 Diesel · #2 11-14-2010, 09:39 AM

I would not take anything out, there is a reason that is there.

Olivier · #3 11-14-2010, 09:49 AM

cheers. just wondering as its teeny. Really restricting the flow.
Olivier

Diesel911 · #4 11-14-2010, 11:23 AM

Everthing on the Car is supposed to work as is.
If you want to modify stuff you do so at your own risk and expense.

Also are the items pictured part of the Delivery Valves or are they the Delivery Valve Holders (called Pipes in the Manual on the older models)?

Olivier · #5 11-14-2010, 11:31 AM

They are the part that screw on the IP and hold the valves inside.
Cheers.
I know everything as a purpose but I still wonder why is it so small.

W124 E300D · #6 11-14-2010, 11:49 AM

Quote:

Originally Posted by Olivier

Hello,
Inside the DV body there is a little restrictor that make the hole teeny.
What is the purpose of this?
Would removing it increase the flow?
Or should be "Do not Remove" at all...
Thank you.
Olivier

It really depends, fortunately the answer lies in a separate question.

Do you know more about diesel injection pumps than Bosch?

Olivier · #7 11-14-2010, 12:14 PM

Gosh, can you stop lecturing me on:
everything is there for a reason (I know)
do you know better then bosch ( I never said so and this is why I am asking) and all the tralala.
Why do people put bigger elements, to gain more power, there is always some tweaking possible.
And what I am asking is Why is that hole so small, the purpose of it been so small, can it be enlarge or there is no need etc...
I am not asking to be looked down, I am curious and want the car to be at his best and I find there is a lot of flow restriction on the fuel system, even the L/P has 2 non return valves and they are teeny as well.
I am thinking of putting an electric pump to get a better flow instead of the L/P as it was also once suggested to me.
But back on topic, those holes are really small, even hard to blow into them, never mind cold diesel or Veg passing through (Please, do not jump on the veg thingy, this is not the question).
Cheers.
Olivier

scottmcphee · #8 11-14-2010, 12:19 PM

Once your car is running well, it would be a really neat experiment if you bored those holes out a bit larger and see what the effects are on performance, idle, etc.

Olivier · #9 11-14-2010, 12:44 PM

This would be an idea, cheers, but I would like to get a bit more info at the moment before I start to bore the holes and need to revert to the smaller ones, just in case anyone did see this before, done it or had a thought of it.
All the best.
Olivier

shoe · #10 11-14-2010, 12:47 PM

The reason those holes are so small is to create pressure so that the injectors have the proper spray pattern. it is my understanding that anything in the injection pump should not be modified. The injection pumps including the delivery valves are extremly precise and do not tolerate modifications at all. Doing so will most likely result in a non-running vehicle.

Olivier · #11 11-14-2010, 12:51 PM

Hi Shoe,
thank you for this.
But those are far away from the injectors, the hard lines are long ish..?
Would those small holes make the fuel "spit" harder? Is that your thought?
Cheers.

W124 E300D · #12 11-14-2010, 12:58 PM

Quote:

Originally Posted by Olivier

Gosh, can you stop lecturing me on:
everything is there for a reason (I know)
do you know better then bosch ( I never said so and this is why I am asking) and all the tralala.
Why do people put bigger elements, to gain more power, there is always some tweaking possible.
And what I am asking is Why is that hole so small, the purpose of it been so small, can it be enlarge or there is no need etc...
I am not asking to be looked down, I am curious and want the car to be at his best and I find there is a lot of flow restriction on the fuel system, even the L/P has 2 non return valves and they are teeny as well.
I am thinking of putting an electric pump to get a better flow instead of the L/P as it was also once suggested to me.
But back on topic, those holes are really small, even hard to blow into them, never mind cold diesel or Veg passing through (Please, do not jump on the veg thingy, this is not the question).
Cheers.
Olivier

See, despite everything you still apparently believe that you know more than Bosch... you still apparently believe that you can mess around with components of a complex integrated system that you clearly do not even begin to understand, and that any changes you wish to make will be utterly predictable and beneficial.

When you don't get the answers you want to hear, you simply start complaining that people are being condescending or you are just trying to educate yourself or some such nonsense.

You are that most dangerous thing, the person who flatly refuses to learn, who is only interested in "answers" that support your nonsensical beliefs.

"The most dangerous component in a motor vehicle is the nut behind the steering wheel."

shoe · #13 11-14-2010, 01:07 PM

Well it is really a function of flow which is technically all the injector pump is doing; moving a certain amount of diesel over a given amount of time. pressure is just the reaction to resistance to that flow of diesel. So yes your theory of the size of the hole being part of how much diesel the IP moves is correct. The point I was trying to make is that when you change the amount of diesel the IP moves at a particular throttle position you may not achieve an increase in power. I may be wrong, it just has been my experience that when you mess with the parts inside the IP you are asking for trouble. And given the cost of a replacement it does not make sense to me. Just my $.02

Olivier · #14 11-14-2010, 01:16 PM

Quote:

Originally Posted by W124 E300D

It really depends, fortunately the answer lies in a separate question.

Do you know more about diesel injection pumps than Bosch?

Quote:

Originally Posted by W124 E300D

See, despite everything you still apparently believe that you know more than Bosch... you still apparently believe that you can mess around with components of a complex integrated system that you clearly do not even begin to understand, and that any changes you wish to make will be utterly predictable and beneficial.

When you don't get the answers you want to hear, you simply start complaining that people are being condescending or you are just trying to educate yourself or some such nonsense.

You are that most dangerous thing, the person who flatly refuses to learn, who is only interested in "answers" that support your nonsensical beliefs.

"The most dangerous component in a motor vehicle is the nut behind the steering wheel."

No, YOU are assuming that I think I know more then I think I do, which I don't.
Your replies are just so blindfolded that this is not funny.
YOU are in your own petty little world.
YOU do not read my post properlly as YOU are so blinded by YOUR thinking of: " I know what this guy is like, think he knows it all" as if you read it propperly you'll see that I am asking question and I do not make assumptions, do I? I am enquiering. Is that clear , probably not to you I guess.
This is all wrong. I am asking questions and YOU are not answering anything beside poking me with your little childish quote. Tut tut...
Do you have a grudge? Something against my questions/ wondering?
Olivier

Olivier · #15 11-14-2010, 01:19 PM

Cheers Shoe,
It does make sense what you are saying, as if the holes are to big the IP might just push the fuel up but not "spit it at pressure", like a hose that you squeeze at the end and the velocity of the water is incresed perhaps?
Thanks.
Olivier