Engine/Transmission (1994 - 1998) Delivery Valves

[nfox]

What del valves do i have, my pump is a 913, 215 hp? What would i gain buy going with a bigger delivery valve? How much do they cost?

 

[M Barnett]

I would guess you have 151 delivery valves. The 191 valves give about 40 HP and a lot of smoke. Seems like they cost about $225.

Michael

 

[Lightman]

if you have a 215 pump then you have 181 d/v the 191s will give you extra power. joe d made 633 hp with 181 d/v on a 215 pump i think he tried the 191s and made no more.

 

[SlyBones]

May not give much extra peak HP, but can fill in the bottom end and help turbo spoolup. With 370's and a #10 plate, thats probably not a problem. I would check with the experts first.



1-604-888-0143

www.piersdiesel.com

 

[Cooker]

191's will have a very noticable increase in EGT's over the 181's.



They will also produce quite a bit more smoke (obviously adjustable, but that's why we added them to start with, MORE FUEL )



As Sly said, they may not increase peak HP, but they will fill in the bottom end and midrange quite a bit.

 

[Jim Fulmer]

N Fox, your pump will have 181's in it just like mine did, the 191's will give you 40cc's more fuel than the 181's. I really don't know were the(they won't make more power) come from, Piers and I were talking about this the other day and he asked me (do you think they made more power) So here is some raw data. I ran my truck on the dyno with my plate in the stock position and 3k's with the 16cm housing, timing at 13. 5 and made 292/680, I just got back from the D/FW dyno and since have added 4k's( helped a little) 370's, 191's and timing is 15. 5 and had to slide the plate back, repeat back . 050 to control EGT's and made 378/832. I really doubt that the 4k's, timing and 370's made 86 HP(wonder what that . 050 worth of plate was good for).



My truck is on it's face at 3300, all the 4k's did was never let it de-fuel prior to the 2900 RPM shift.



Jim

 

[Cooker]

Jim,



What injecotrs did you have before?



I agree they definitely add power, very noticable on the bottom end and midrange, but I don't feel it much on the top end (maybe it's becasue I haven't added a GSK yet? )



Don M (before he had to leave) dynoed the exact same truck on the same day changing only the D-Valves between runs. Didn't get any noticable gain in peak HP (I think it was 1 maybe 2), but he said the low end and midrange was much fatter. From what I understand Joe D. has also proved that the 191's do not add peak HP. These are my observations from what I have read and learned here on the TDR. I don't know what Piers opinion is, but I would like to know if he feels that 191's add peak HP.



With that said, I really like how the 191's fatten up the low end of the truck, and that 40cc's of fuel really adds to EGT's



-Ryan

 

[nfox]

Can my stock delivery valves be modified, or would it be cheaper to buy modified del valves? Bigger del valves will richen up bottom end, so it will help my PDR HX40-16 spool up faster, when i get it put on. How much egt do the del valves add?

 

[Jim Fulmer]

Ryan, My first injectors were stock 180 Hp ones, as for Don and Joe not gaining power I don't understand it mine had 181 DV's in it just like there's, Don and I were talking about that very subject yesterday. It would be interesting to know if it was a 215 HP pump thing or not.



Jim

 

[drice]

increase hp

ok here is a question what about us 175 pumps would 191 help us??? don't know much/ anything about d valves except I need some and a 4k GSK oh and of course more power

 

[HoleshotHolset]

I went from 131s to 181s and noticed the better bottom end and midrange that everyone is talking about. The truck also smoked a lot more... .



FWIW, every 180hp auto transmission 12-valve truck I have worked on has had the 181s in it... .



Matt

 

[Dave Fleming]

HoleshotHolset,

I have this dinky 3500 that came with the 160 HP injectors and I had a set of 180's installed along with a Piers turbo and 3 piece manifold. Now since my eye sight is too poor to read that CPL thing without a gazillion power search light.

And idea of what may be in my 'project truck'?

I do thank you for your time.



dave

 

[Cooker]

I know the question wasn't directed at me, but I can answer that question for Matt and save him the typing.



The 160 pumps have 131 delivery valves.



Take care,

Ryan

 

[Dave Fleming]

Ryan, thanks for the reply.



Now the question is should I or should I not change delivery valves or is some other modification higher in priority?



I am not a 'smoker nor more power fan' just want the most efficient engine ( within reason ) and can have.



So far the 180 injectors and turbo have made a world of difference in the truck.



I can actually pass someone now!

 

[98rammer]

low end and mid range right? well what about the guy who blew his hx-35 at 47 pounds of boost? he only has the #11 plate and 191 DV's...

 

[Extreme1]

My Input:

The DV's will help cover up the uneven running at lower (off idle to as high 1,500) RPM. This is what happens when you put 370's in a truck with a 160 pump. It can also happen with 215's in a 160 but not as bad. Pump balance (cylinder to cylinder variation) makes this roughness worse and is common on higher milage engines.



In my case, I added 215 injectors to my 160 horse engine. The power increase was very significant but there was a slight bucking or roughness from 1,000-1,200 RPM. A set of 181's (thanks Joe!) made this a very smooth and well balanced combination. The only other addition I would make at that level would be a PDR HX-35. Also, the pump needs to be pulled and adjusted (rebalanced).



My next move was to add 370 injectors, the stumble is back and it's worse. My next move is to move up to a 180 pump (adjusted for more than stock delivery) and switch my GSK and plate over.



As for the comparisons Jim did, I really think the injectors and GSK did most of that. Comparing the difference on my truck with only an injector change, the EGT's did go up quite a bit, especially at high (2700+) RPM. High RPM makes more heat on a long run as well which I saw when I installed a GSK earlier this year.



I hope this helps answer some questions. I learn a lot every time I talk to Al at PDR (Great folks!). Making mods to the truck and carefully evaluating the results helps to increase my understanding of how the pump parts work together to make it all happen too.



Wait till you see it in it's next configuration.

 

[SlyBones]

It is true that curing the stumble when moving to large injectors is one use of the 191 delivery valves. Another use is to perk up the bottom end, decrease turbo lag, as people here have mentioned. They does work quite nice for that.



The question at hand is about how much peak HP is gained. I am interested in those with the laser cut delivery valves. What is the common use for them? Do people add laser cut delivery valves for more peak power?

 

[nfox]

Del Valves

Can my stock del valves be modified or is it cheaper to buy new ones? How much do they cost?

 

[Extreme1]

I noticed a small increase on top end going from 131's to 181's but, like mentioned above, most improvement is down low.



Stockers can be laser cut, it may not be the most cost effective method. It is usually reserved for very high fueling rates with very large injectors.

 

[nfox]

191 Delivery Valves

How much do 191 delivery valves cost, roughly?