Broncboy33

I don't know what happened I had a buddy make an account cause I couldn't log into mine but here we go again lol Hey everyone I'm having a hard time deciding if I want to do a complete overhaul on my early 2006 dodge cummins or just buy a new motor I have a misfire in cylinder #3 and #5 only holds 100 psi compression and injectors are all failing would it be easier to do a complete overhaul. Build it up for serious power?? I was thinking of boring the cylinders .20 over 12 valve hardened rods fly cut mahle pistons ARP head studs heavy springs mill intake port entire head fire ring with gorilla girdle and main studs with a little bit bigger cam around 188/220. Not sure about turbo upgrades yet. Then have fueling upgrades to match the engine build. Really need the help looking for some experienced engine build advice pretty familiar with the motor just not with building them. Any input is very appreciated thank you

dogger

I presume your truck is not running presently due to the problems you described. I would recommend rebuilding your motor for 2 reasons. First, you want to do some serious mods so why incur the cost twice, new motor and upgrades. Second your block and heads are probably in good shape so if you purchase an new motor what will you do with the old one? A Cummins engine would be a pretty serious paper weight.

The only consideration would be time as a new motor would probably be a relatively quick swap in comparison to removing, disassembling, having machining done, reassembly, and installation of the modified motor. In the long run it would probably be a push concerning costs.

One other consideration if your truck is drivable would be picking up a used motor from a salvage yard with a guarantee if there is a problem with the block, crank, or head after inspection you could return it for a replacement or refund. Perform the mods on the used engine then do the engine swap, but then again your old motor would be a really big paper weight. Good luck!!!

L8r,.............dogger

Broncboy33

The truck is running but it runs like crap it is still running. No where around my area do people sell used motors they are all reconditioned and want an arm and a leg for them. The cost I'm looking at now to rebuild the engine is around 3500 bucks the cost of a brand new engine is 6500-9500 bucks complete stock. I'm just struggling on decisions seeing that I do have kids but not a very big budget.

TxDiesel007

stock rebuild sounds like it be your best bet...

im in the same boat you are right now.. lost a ring, and lost a motor... it stinks...

cost efficiency would tell me go stock rebuild, and keep it stock for now...

Broncboy33

I like stock.... stock is good buuuuut there is that one diesel performance bug that keeps whispering in my ear.

Spooler

Don't waste your money on 12v rods. CR's tend to bend them easy up in the 800hp or higher range depending on how it is tuned. Just build it back with stock rods, upgraded cam and springs, stock MLS headgasket, and ARP 625 studs.

Broncboy33

What are the best rods you can get for a durable build?? Cause more than likely the truck will eventually have some serious power and from what I've heard CR rods are the worst. But like I said all the advice I can get for anything on these common rails will be great.

Spooler

Carrillo's rods. They are expensive to the tune of 2400 and up for a set.

pronstar

If rebuilt is $3,500...and brand new engine $6,500...that's an easy choice for me.

I'd spend a little extra to rebuild with top-shelf parts, and be money ahead with an engine that's better than stock.

soulezoo

It sounds like the personal life expenses are going to nullify any personal wants.

When you are in the area of needing upgraded rods and a girdle (you will also need a 12v crank at that point too) you are in the realm of mods that will be close to $20-25k in expenses to do this. Heck, you can make the tranny (auto) and turbos alone reach $15-18k quite quickly.

So think about what you really want/need.

You can get to a really strong 6-700 hp without the fancy rods/pistons/girdle and etc. and keep costs down dramatically.

You'll still need the turbos and tranny in the end. And you can get all the clutch in the world, I have my doubts on the G56 handling that much power.
Stuff to think about.

Broncboy33

My goal on this rebuild is to be eventually around the 800hp range. But I want durable internals on the motor so I know it's gonna be dependable under heavy hauling loads. I want a lot of power but also decent fuel mileage. I've already had work done to my transmission and transfer case at a local shop.

soulezoo

Ok, but just take some time to think about what you really want... lot of power/decent fuel mileage are mutually exclusive.

You don't need flycut mahle pistons with the cam you call out and your power goal. Do you really want the decompression that flycutting gives? What depth are the flycuts? Do you understand the effects (good and bad) that decompression entails?

CR rods are not the worst. They are actually pretty good rods. They are just not designed for the power you wish to put them through. 12v rods are an upgrade (forged vs the cracked cap) and the carillos (or cunningham even) are top of the heap.

Again, just things to think about other than throwing money at stuff. I'd rather see you make an informed decision based on actual needs and facts provided then just some internet advice. High performance advice usually doesn't correspond with "heavy towing" advice.

To get to 800 hp, you're probably going to want 120hp injectors... find out how many of those manufacturers recommend "heavy towing" with those stix. Usually, 90hp stix is the limit and even then not "heavy towing". (Quotation marks are because you didn't define what that meant to you)

TxDiesel007

just like a 12 valve...

you cannot have a toy truck, that will tow heavy as well... look at the diesel power challenge, they build trucks to try and do both, and usually someone always has some kind of carnage..

other than the above I said, I agree with soulezoo on this one..

stock is good, the bug is bad..

Broncboy33

Ok I definitely will think about what I want right now I'm still pretty unsure but I do know that I'm going to rebuild the engine I'm just not sure to what extremities I want to go to with it. But definitely keep giving me advice and give me any ideas on the build. I am having it bored .20 over.

Spooler

Best advice is to stay conservative if you tow heavy. It will cost you more in the reliability area if you go too far.