Best delivery valves

[Sled Puller]

Originally posted by BPINE







I'm not sure how some people get to the HP levels they do with a 180 pump but I guess they do or so they say.

I have many, many witnesses, it is the 180 pump that came on the truck. It was tweaked a hair, but nothing exotic.



A lot of it has to do with engine cam and turbo selection, meaning, you have to BURN the fuel, brother, to make power!



I am very happy with with the stock 370s and the 180 pump making the power I have. I also run a little bit more timing than most, but the engine was put together properly to handle it, I don't recommend high timing to stock head gaskets.



I konw where I can be with an injector change, and a pump change.



It will make a lot of people:{

 

[Joseph Donnelly]

The gain on the 180 pump from 370 injectors should be in the 75-100 hp range. One truck I know of got around 85-90 hp on the 175 pump.

 

[BPINE]

. A lot of it has to do with engine cam and turbo selection, meaning, you have to BURN the fuel, brother, to make power!





I agree Gene there is more to it than just throwing fuel at it that is for sure. In your case I can see the power but others I am a little unsure.

 

[DHRA]

How did I miss this thread? This is my favorite subject.

Independent study on a Bosch approved test stand measuring the 1/2 stroke:



181 to 191 we saw a gain of 60 cc's delivered fuel

181 to cut DV's we saw a gain of 100 cc's



This was on a 911 pump. I can get the numbers for the 913. We also did a pump from a 96 automatic, using stock cam and stock B&P we were able to acheive ~500 cc's and ~6200 RPM's. We'll have those dyno numbers soon.

 

[83 crew cab]

there you go giving away all my info again George

 

[BPINE]

It's about time Eric, those are the #'s we wanted.

 

[Brandon]

cc told me to take out those pesky dv's... ... ... .....

I think I am gonna give that A try... ... but piers dv's are friggin rude... ... ... ... . rude is nice

 

[Sled Puller]

Shoot, I'm still wondering why we have injectors, all they do is stop up the flow from the pump.

 

[HoleshotHolset]

... good thread!



Now go out to your truck and take out your plate! Rack travel is your friend!



Matt

 

[Strick-9]

Brandon,



Not sure if you were joking or not. I tried removing my delivery valves about a year ago when I was looking for more fuel. That was a definate move in the wrong direction. Max power WAY down, idle dropped about 500 rpm.



They really need to be in there as a check valve to prevent fuel (in the lines) from flowing back out the pump once the helix uncovers the fill port.



But they need to be as free flowing as possible in the forward direction. That's why cutting them helps fueling.



-Chris

 

[HoleshotHolset]

Brainstorm or maybe brainfart... .



Don't the PSD guys remove some sort of check valves in their injection system? I know we're comparing common rail to pump-nozzle (lemons to apples... ), but maybe this is still kinda related... .



Matt

 

[J.R. Adkins]

Originally posted by Strick-9

I tried removing my delivery valves about a year ago when I was looking for more fuel. That was a definate move in the wrong direction. Max power WAY down, idle dropped about 500 rpm.



They really need to be in there as a check valve to prevent fuel (in the lines) from flowing back out the pump once the helix uncovers the fill port.



But they need to be as free flowing as possible in the forward direction. That's why cutting them helps fueling.



-Chris

Matt, Read this agian!

 

[HoleshotHolset]

Can of worms officially opened:



I did read it... .



But there's no explanation why the power is down... . there is only an explanation as to why having them is a good thing.

Why is this fuel coming back to the pump, and how is it hurting power?



Just trying to understand things here... .



Matt

 

[6shotz]

What size is a stock pump in a 1997 auto and what size are the delivery valves. What size delivery valves are the ones sold by BD. Had them installed in my truck yesterday and the power increace was noticable but EGT's went up also. I use to at WOT hit 1250* pre turbo and now @ WOT can hit 1550* smoke is more noticable. Should I have left well enough alone? Just thinking outloud





Steve

 

[Strick-9]

Matt,

It DOES explain why power is down.



Think about TIME and PRESSURE.



Remember that fuel does compress and the lines expand as well under pressure. Let's assume injection pressure of 20,000 psi and injector popoff pressure of 5,000 psi.



The plunger comes up and compresses the fuel up to 5,000 psi. Now fuel is being delivered through the injector, but the plunger is coming up much faster than the injector can deliver it. So the fuel is compressed and pressure rises up to 20,000 psi.



At the end of the injection cycle in the pump, the fill port is uncovered by the helix on the plunger. This means that the high pressure on the plunger is now vented down to lift pump pressure.



With NO checkvalve in the system, pressure in the injection lines would ALSO be vented down to lift pump pressure. (injection stops)



Now insert a check valve (delivery valve). The same events occur, but when the injection pump vents off pressure, the check valve will now slam shut holding the compressed fuel in the injection lines. The fuel will continue to expand as pressure drops down to 5,000 psi and the injector seats (closes). Thus more total fuel is delivered WITH the check valve.



Make sense?



-Chris

 

[HoleshotHolset]

Chris:



Thank you! Now THAT makes sense... . okay I'll refrain from removing any more parts from my P7100... . for now.



I gotta get me a P7100 manual/schematic/video..... To much stuff happening behind the scenes that I want to know about.



Matt

 

[bighammer]

I'm just guessing here, but the removal of the DVs would slightly retard timing because the pressure in the line needs to be built up again before injection can occur.

 

[J@NWC]

I could'nt leave this alone so I took a set of 191's and my laser cut delivery valves for a test drive to the local dyno (dyno jet) runs done 20min apart (alittle slow swapping). With the valet switch on (low power mode) gain of 79hp and 166ft-lbs and 13lbs of boost. EGT's around 1000deg pre turbo. In the power on mode gain of 23hp and 123ft-lbs a little hotter with the laser cut's but not a huge difference. I believe with a bigger turbo(s) the power on mode increase would be more substantial. Even though the increases were not huge their a little better than 0. 0

 

[DHRA]

That's fantastic Jason! Wow, that's quite a bit more hp than what I would have guessed. Thanks for doing that, great info! Lot better than reading a book and applying theories!

 

[Cooker]

Thanks for your efforts Jason. Great info.