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Discussion Starter #1 (Edited)
Need some help in getting the right injectors for me. I just came back from the Diesel Nationals and after talking to BD Diesel - may switch some things up. Bear with me -- I am not the diesel guru that I wish I was.

96 12V 3500 4x4 w/NV4500. I will most likely NEVER race this truck or sled pull, but want to make the MOST power possible while still maintaining a daily driver. I need to pull 20000 pounds uphill all day long and not blow another head gasket or break into extremely high EGT's.


Here is what I have so far. BD twins going into a COMPLETE rebuild. The only stock components left are the block, crank, pushrods, and piston rods (possibly the came -- see below). DPS is doing the block and head work. Block is being bored 40 over and using Mahle pistons. 12mm ARP studs going in. Fuel plate done by Haisley. Minor pump work done. New cylinder head with 60 pound valve springs and titanium retainers and keepers going in. ATS 3 piece manifold. All the necessary gauges already in. 4GSK in. Brand new NV4500 installed less than 5000 miles ago with a Southbend Con OFE clutch.


1.) After talking to BD, they told me that buying a new cam is a waste of money -- they mentioned a better set of injectors would do more than any cam would for my needs. What do you guys think?

2.) I have a chance to buy a set of 435 injectors by mdavlee, but they have had more work done to them by Wicked. Do you think a set of honed 435's will be too much for what I want? Should I run my delivery valves with them? Should I be looking at a smaller injector (370's) and run dvs with those? Should I follow BD's advice and buy the best injector possible and skip the cam -- more along the lines of DDP4's?

3.) We are fire-ringing the new head, but BD insisted that a good o-ring job would be much better for me, esp since I will never be breaking past the high 70 pounds of boost mark. They said o-rings generally last longer. Thoughts?



Any other constructive thoughts would be helpful. Most importantly right now -- thoughts or advice on injectors so I can give mdavlee an answer by tomorrow. Sorry for the novel -- just lots of questions. Thanks
 

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The beauty of BDs twins are that they are really small so they work with stock components or a 600hp build. What That means is you don't have to decide on injectors right now.

A nice set of stock replacement pistons or even some 155* marine ones would work good, but you probably won't be running enought timing to warrant them (if you wanted to run 370 injectors they would work). I think marine version rods or thought to be slightly stronger, but again, no big deal.

1) A cam is a great idea IMO. Yeah for the dollar you make more power with injectors, but since your taring down to rebuild anyways, your gonna save the $1000 on the install. I vote get an aftermarket cam. They spool better, run cooler (as in lower EGTS), and get better MPG.

2) 435s are nice but they are kinda big, and will be a little smokey. DDP 4s are the same orifice size but are AFM'd and will flow more, and be much cleaner. They are better all the way around if you have the $. If I were to run 435s on a tow rig, I'd bump the pop-off pressure up a little bit, but that will cost you some flow.

3) Fire-rings tend to need to be replaced every, oh say 30,000 miles. O-rings will be more than enough.


Oh and don't run titanium keepers and holders. Titanuim will crack after a while. If your staying under 4000rpm stock replacement will be enough.

South bend doesn't make an OE. They make a con O, an OFE, and an FE. I 'd guess you meant an OFE but 450hp will be to small for what your planning (stepping down to New Era 370s or DDP2 or 3s would keep you there, but why not go big). Look into a 3200lb Double disk if you want more than 500hp.

An you didn't really mention what head work you were having done. You'd really like having the head ported and polished if you have the money.

191s and laser cuts are different things. You won't want laser cuts (laser cuts = full cuts) for towing all day. Go with anything else with a shoulder.
 

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Im wondering the same question, only Ill make it simpler. I am going with BD towing twins as well. Will ddp 90's be enough fuel, or should I step it up and go bigger? Basically what is the biggest injector I can run with the BD twins that isnt overkill but is also ok for daily driving?
 

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bump bump..anybody?
 

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bump. would the 90's be enough or should I go with the stage 4?
 

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90's are fine.
 
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