Delivery Valve Questions
 

Hey guys,
was wanting some information on DV's. What do the numbers mean (181, 191, etc) and whats the best ones/ biggest ones to get? I've asked a couple of diesel performance shops before and they don't even seem to know the answer to my questions. I like to upgrade stuff to the point that i really won't need to upgrade the upgrade at any point in time (the only exception being my turbo due to budget and driveability). At this point i have a 215 P-pump with stock DV's, no plate, AFC full forward, 4k rpm GSK, Bosch marine 370 injectors, AFE cold air intake feeding a Schwitzer S300G turbo making 52 lbs, 4" downpipe & exhaust going through 6" stacks, and a Haisley Street/Drag dual disc button clutch powering an NV4500 via a 1 3/8" billet input shaft, with all the upgrades possible in the tranny, Dana 60 front/Dana 80 rear with 4.10's, rolling on 39.5" Super Swamper Iroks. I recently swapped the factory 3.55's for the 4.10's and that really helped it out alot but I still want more power and the delivery valves are next on my list I just wanted to know what to use. After that I'm thinking Snow Performance water/meth kit and then some fire rings and studs before upgrading the turbo department again. I went with the Schwitzer S300 because of price and availability when my Holset factory reman'd HX35 took a dump after 30k miles of 50# of boost. I always let my engine warm up fully before making over 10-15# boost and always cool exhaust to 300 degrees before shutdown.

Thought it would be good to describe my setup so good recomendations can be made on the DV's. I basically want to get the biggest ones i can without going custom. That can be done later i just don't want to get mid range off-the-shelf stuff. The truck was dyno'd at 428hp and 1,081 lb/ft. at rear wheels on this set-up...

A buddy has some brand new Scheid Laser Cut 181's he wants 250 for a set of 6 of 'em. Is that what i need or is there something better out there?

Thanks for any help!!
Eric

Delivery valves?
 

You should already have 181's in the truck (that would be stock with a five speed)
I went to City Diesel and got their delivery valves. If you keep on doing 50 + lbs of boost you will blow the head gasket. From what I know 50 is asking for trouble. Your next thing should be the head gasket and fire rings. Before anything else

hey bud ive been holding 55psi on a stock headgaskat with 260,000 miles for quite some time, also my budie has been holding 62psi on his stock hedgasgat for atleast a year with over 200,000. its not exaxty hg failer its the head lifting off the block thats why you should hed aftermarket headstuds

While some people are lucky. Most people say don’t push it past 50psi. Iwould say 191s i hear LCs push too much fuel for daily driving.

Ummm yea i know alot of people say no more than 45 psi... I was talking to Mark Chapple, owner of TST (located here in my town) today and he said his 95 (i think) 12V they have been running 55 or 60 psi through it and he's owned it since new, and its had no problems with stock head gasket. I do realize it maybe playing russian roulette, but i've been running it this way for over a year now (25k miles or so) and no problems. I don't run the piss out of it all the time, nor do i hold it to the floor for any time at all when i do, because it will either skyrocket the EGT or turn more RPM than i care for it to... And I don't get too great of fuel mileage anyway (13-14 mpg) so if LC's are heavy on fuel, big deal... I mean don't get me wrong for my setup i'm content with that fuel mileage but i know a lot of diesel owners would be disappointed with that.

So basically Laser Cut 191's is probably what i would want? Any idea how much power (roughly) i could expect to gain from that? and where's a good place to get 'em? I prefer dealing with Scheid Diesel as i've been pleased with them before, as well as TST (they only sell the 181's though) but Scheid's website only lists one DV and they don't even say what size they are or anything, no details at all. I wish they would rebuild their website, but thats another issue lol...

Thanks
Eric

After 191s there are 022s and 024s then custom laser cuts. I know DDP has their own 024s that are supposed to be real nice.

i ended up with the 191's and love them boosted my fuel milage almost 4mpg

are the fully cut ones the 191's

Thanks for the pic and info. I spoke with JP at Scheid's and he said for $200 they will full cut my 181's i have now. He said there's no use in just doing half cut because everyone ends up going full cut anyway and i totally agree with that! no sense doing it twice!!!!

So when i scrape up the cash thats whats going to happen. Then we may upgrade injectors too lol....