Duramax/cummins conversions?

[Car'n'Guitars]

Originally Posted by 82ccshorty

That would be different but very wrong for a Chevy
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That's what I was thinking.

[82ccshorty]

I think I'm going to lean more towards the cummins but if a duramax comes up cheap I'll buy it
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[Car'n'Guitars]

Unlikely but do some junkyard hunting for an engine.

[Edahall]

Originally Posted by 82ccshorty

I think I'm going to lean more towards the cummins but if a duramax comes up cheap I'll buy it
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Might be easier to buy a whole Duramax truck that has been rolled and put your 82 body on it.

[82ccshorty]

Ive considered that too but I can't seem to find any rolled ones
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[Car'n'Guitars]

Like I said search junkyards, it might be a longshot but you never know.

[GW72C20]

Originally Posted by Edahall

Duramax Advantages:
Quieter
Lighter weight and not so tall
Allison automatic can be used behind it

Duramax Disadvantages:
Conversion is much more difficult
Initial cost will probably be more to buy a Duramax/Allison combo
Parts are more expensive
Expensive injectors are failure prone
Hard to get very good fuel economy

Cummins Advantages
12 valve has no electronics to deal with so conversion is much easier
Cheaper to make lots of power (P-Pump)
Better fuel economy
Parts are less expensive
No failure prone items
Can be used in front of a 6 speed NV5600 manual transmission

Cummins Disadvantages
Heavier and taller
Automatic transmissions that go behind them are failure prone
Hard on automatic transmissions
Noisier especially with the P-Pump (94-98)
VE pump (88-93) is only good for 450 hp vs 1000 hp for P-Pump

Injectors are only a concern in the lb7, 04.5 and up aren't prone to injector failure. The Lbz 06-07 classic dmax are solid motors and are favored by most who do swaps. But cost is an issue and deters most. Look up duraburb, quality swap jobs done right. But again....$$$$$.
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[Don SC]

4BT Swaps is a good site for a bunch of info-- and it's going to take a lot of info to do a diesel swap.
http://www.4btswaps.com/forum/forum.php

[Edahall]

Originally Posted by GW72C20

Injectors are only a concern in the lb7, 04.5 and up aren't prone to injector failure. The Lbz 06-07 classic dmax are solid motors and are favored by most who do swaps. But cost is an issue and deters most. Look up duraburb, quality swap jobs done right. But again....$$$$$.
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The LBZ's also don't get the fuel economy that the LB7's get.

[82ccshorty]

I would like a duramax but I'm not a master mechanic so when it came to making it work I would be at a total loss.
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[GW72C20]

Originally Posted by Edahall

The LBZ's also don't get the fuel economy that the LB7's get.

No they typically don't. But with good tuning they can get more mpgs out of an Lbz or any other dmax for that matter. I know firsthand as I've owned them all over the years and needed those extra mpgs.

If someone was deadset on doin an lb7 swap (def cheapest route for dmax) they could add an Airdog lift pump to help filtration and get the longest life possible out of the injectors. They're still gonna go at some point because of the faulty design but you might as well do what you can to extend that interval.

I'm not arguing the dmax is a better swap over cummins, just want to make sure people reading see the right info.
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[82ccshorty]

Originally Posted by GW72C20

No they typically don't. But with good tuning they can get more mpgs out of an Lbz or any other dmax for that matter. I know firsthand as I've owned them all over the years and needed those extra mpgs.

If someone was deadset on doin an lb7 swap (def cheapest route for dmax) they could add an Airdog lift pump to help filtration and get the longest life possible out of the injectors. They're still gonna go at some point because of the faulty design but you might as well do what you can to extend that interval.

I'm not arguing the dmax is a better swap over cummins, just want to make sure people reading see the right info.
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My lb7 has 140k miles and is about to be on its 4th set of injectors but my lb7 gets better mileage than my lbz. I'm saying that cause I have both and lb7 with nothing done to it runs circles around my lbz
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[Edahall]

Originally Posted by GW72C20

No they typically don't. But with good tuning they can get more mpgs out of an Lbz or any other dmax for that matter. I know firsthand as I've owned them all over the years and needed those extra mpgs.

If someone was deadset on doin an lb7 swap (def cheapest route for dmax) they could add an Airdog lift pump to help filtration and get the longest life possible out of the injectors. They're still gonna go at some point because of the faulty design but you might as well do what you can to extend that interval.

I'm not arguing the dmax is a better swap over cummins, just want to make sure people reading see the right info.
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The biggest issue with these injectors are not that they fail, but that they are expensive and difficult to change out. $5000 is the typical price that is quoted by the dealer to change them out.

[82ccshorty]

Originally Posted by Edahall

The biggest issue with these injectors are not that they fail, but that they are expensive and difficult to change out. $5000 is the typical price that is quoted by the dealer to change them out.

i had mine quoted the other day cause i have one going bad in my lb7 again (4th time) and they told me $3500 and the injectors was 2/3s of the cost

[GW72C20]

Originally Posted by Edahall

The biggest issue with these injectors are not that they fail, but that they are expensive and difficult to change out. $5000 is the typical price that is quoted by the dealer to change them out.

I would say the fact that they fail is def the biggest issue. It's not acceptable to eat the cost of the repair when it's Bosch's faulty design and not the consumer's. Which was one reason GM extended the warranty on them to 200k miles or 7 years I believe. They're not horrible to replace either if you're mechanically inclined. And again, we're talking lb7 motors only here.

Originally Posted by 82ccshorty

i had mine quoted the other day cause i have one going bad in my lb7 again (4th time) and they told me $3500 and the injectors was 2/3s of the cost

Exactly, this is the typical price quoted by most dealers. You can just replace the injectors on that one side instead of them all if you choose to. That's another option.
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[82ccshorty]

Exactly, this is the typical price quoted by most dealers. You can just replace the injectors on that one side instead of them all if you choose to. That's another option.
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i have thought about that but then another one could go bad not to long after your better off to change them all. GM has replaced mine under warranty 3 times and this time they wont because it was 200,000 miles or 7 years and my truck is 10 years old.

[GW72C20]

Originally Posted by 82ccshorty

i have thought about that but then another one could go bad not to long after your better off to change them all. GM has replaced mine under warranty 3 times and this time they wont because it was 200,000 miles or 7 years and my truck is 10 years old.

I edited my original post to 7 years, thanks!

It's just an option to do the ones on the same side and not touch the other side. You can always go back in later on the other side if you have one goin out. It just sucks there's no permanent fix for the issue in the lb7.
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[82ccshorty]

as that is an option i would rather do them all and not have to go back in anytime soon, i have heard that industrial injections makes a 50hp injector that last longer then the stock ones but they are like 330$ each

[GW72C20]

Originally Posted by 82ccshorty

as that is an option i would rather do them all and not have to go back in anytime soon, i have heard that industrial injections makes a 50hp injector that last longer then the stock ones but they are like 330$ each

Do you have any mods on your lb7?

[82ccshorty]

4inch exhuast and thats it, it has a chip in it but never used.

[GW72C20]

Gotcha, I still think it's a crapchute as to whether they'll last longer or not. Plus, I don't see the point in the extra coin for bigger sticks when you have no other supporting mods. Save the $ for the next injector job, lol.

edit: using additives can help too if you don't already.

[82ccshorty]

Originally Posted by GW72C20

Gotcha, I still think it's a crapchute as to whether they'll last longer or not. Plus, I don't see the point in the extra coin for bigger sticks when you have no other supporting mods. Save the $ for the next injector job, lol.

i dont see the point in putting them in it unless they will last longer, ive read about people thats used and they say they have gotten twice the life out of them compared to stock ones? but whats there stock life spand? my first set was changed at 31k miles and my second at 50k then my 3rd at 90k. What i dont understand is why some of them outlast each other when they are the same thing? this will be my 4th set at 140k

[GW72C20]

Originally Posted by 82ccshorty

i dont see the point in putting them in it unless they will last longer, ive read about people thats used and they say they have gotten twice the life out of them compared to stock ones? but whats there stock life spand? my first set was changed at 31k miles and my second at 50k then my 3rd at 90k. What i dont understand is why some of them outlast each other when they are the same thing? this will be my 4th set at 140k

Agreed, exactly why it's a crapchute. My lb7 went 73k before injectors went. Then at 165k they went again. Who knows when they'll need to be replaced a 3rd time as you can't time them and I don't DD it anymore.

[82ccshorty]

Originally Posted by GW72C20

Agreed, exactly why it's a crapchute. My lb7 went 73k before injectors went. Then at 165k they went again. Who knows when they'll need to be replaced a 3rd time as you can't time them and I don't DD it anymore.

mine is really not a DD but more of a Tow Rig for my business. it tows a 40ft gooseneck weighing in at probably 20k pounds

[82ccshorty]

What Kind of cummins would be in a 90 ram? Would it be a non p-pump?
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