I have a 1999 DR 4x4 with the Cummins diesel,, has 224,xxx miles on it and still going strong,, but I think I've got an injector or two going bad.
If I was going to change injectors anyway, I figured I might as well get a little more power, I've been looking at the Bosch 275's as a possible set since they are just a little over stock.

My question is this, will larger injectors decrease the overall life span of my motor? With that many miles on it, will the extra fuel going in be too hard on my motor?

I am more worried about this truck lasting a long time than high performance, but would love some performance too. The truck is pretty much stock as far as I know, bought it with 210,xxx miles. I've put a 4" Magneflow exhaust system on it from the turbo back is the only performance modification. otherwise I just keep up with the maintenance. I believe that the previous owner may have changed the head gasket because the freeze plugs in the head look really new.

Thanks for any replies!
Matt

 

Personally I think there are better low power(+60HP) then the 275's. There are a couple of options. There are a lot of opions. There are MACHs and Jammers both smoke less then 275. The MACH is more money. Jammer (full injectors) can be had for the same or less then 275's. It just depends on how much you want to spend.

Randy

 

I may have some Diesel Dynamics Stage 3 (100hp) injectors for sale soon.

 

Who makes the O.E. or O.E. replacement injectors? Bosch?

You're right, there are lots of options.. I should research this more before I buy a set. This is my first diesel powered anything,, so I'm new to this and still figureing it out.

My main concern with going to larger injectors of any brand are the long term effects on my motor overall. I know that more fuel going in = more heat and that has to be a little harder on the motor,, but these cummins engines are pretty tough so I'm not sure if it'll be an issue down the road or not, espicially if I dont go much larger on the injectors.

I was hoping to hear some replies from people who have swapped in larger injectors and what kind of luck they have had. ANybody out there got a high-mileage rig with bigger injectors? Also,, what kind of effect does this do to your gas mileage?

Thanks for the offer on the 100 hp injectors u might have for sale soon. I might be interested but wasn't really planning on jumping up to quite that big of injectors.

Thanks
Matt

 

I think the 275RV injectors are hard to beat. For the money, you will not go wrong.

 

Where have you seen them cheaper then 275's?
You can get 275's on ebay for $280 and there is also a sponser here claiming he can even beat that price.

I put mine in at around 162K miles, I'm sure you'll be fine

 

You are right......you are not going to find brand new custom sticks cheaper than 275's....replacement nozzles, yes, but not a full injector. I agree with Preston, for the $$ they are hard to beat....if you are considering spending more money and want more power than the 275's offer, don't bother with anything less than a 90-100 hp injector......it just isn't worth it.....the latest tech Mach 1.6's burn far too clean and cool to bother with anything less, IMO. And no, running an injector like a 275 will, in no way, compromise the life of the engine.....there are many medium duty trucks, buses and RV's with the 275 hp ISB running around with huge miles that work a lot harder than our CTD's do without longevity issues.

 

Well said! I would go as far as saying you won't shorten the live of your Cummins 5.9 by going to 400 hp. Even higher....depending on how you drive it.

Matt - Yes, Stock is Bosch. Getting 200,000+ miles out of stock injectors without noticable problems....is exceptional, IMO. Many injector experts say they notice deminished performance/output, and leakage, at under 100,000. My guess is your way overdue.

RJ

 

I have had bigger injectors in since 60000, now I have 158000 and going strong. Never an issue, it is truly how you drive it, I am fairly easy going on my truck, well not always, lets see drag racing, sled pulling......some burnouts. Still keeps on, oh ya I do tow with mine also, a 28 foot enclosed hauler. So the truck does get its fair share of work.

 

Somewhat controversial statement, maybe- -but I'd still agree. It's not how much HP you *have* it's how much you *use*.

It may be best to think of it in terms of HP-hrs built into the engine. If it will last 750K miles while asked to put out 120hp constantly, then it might last half that when asked to put out 240 constantly. Obviously this isn't linear, or we could expect an engine to last over 100K while putting out over 750hp constantly--- that isn't likely to happen.

I think to a point that increasing HP actually HELPS longevity. This, because the engine will reach operating temps sooner and the engine will run hotter in general. I think there's a reason that the longest lasting CTDs have been used to tow-- the extra load is what they are DESIGNED for, and has beneficial effects on temp stability, piston stablity, etc.



Heck, if you have a truck with 150hp injectors and a big box but still drive it like stock and don't exceed 21psi of boost, then I can't imagine the engine being taxed any more than stock.

I think enhancing the lubricity of the fuel you use (additive, biodiesel, whatever) has a beneficial effect on injector longevity. I try to run Bio and/or some Fuel Power when I can.

jh

 

Thanks a lot for all the good info/advice!! This is a great website!!

rjohnson,, I dont know if they are the stock injectors or not since I bought the truck with 210,xxx miles on it.. I would guess it may be a second set.

While there's a thread going, let me ask another question though.. How do you know, really, when you have an injector going bad? My gas mileage isn't too bad, and the truck seems to have power(first diesel though, so not much to guage against). It wont burn the tires off but seems to pull a 20' trailer without a problem

My problem is a sputter or cough at idle when warm, does not do this until engine is warmed up. Say you go down the highway at 60 mph+ for awhile,, and then come to a stop, , it had what I would call a "miss" if it was a gas motor. Never feels like it's going to die or stall,, just a cough.. bad enough to make the truck shake enuff while sitting that my wife even notices!! hahaha
Not too much smoke,, just about as much as I'd expect from a high mileage diesel.

I've been given advice from somebody on here that they had a similar probvlem and put in the 275 injectors and it went away.. The reasoning behind it was that one or more of the injectors was going south and couldn't handle the "pop" pressure once warm. Does this sound like a reasonable explanation to anybodyhere??

Thanks again for all the replies!!!

Matt

 

City Diesel. Their complete 60HP injector is less then $300. I doubt you'll find 275's for SUBSTANTIALLY less and even IF Jammers aren't the best they are better the Bosch and they will give more power and less smoke. On a TDR thread Mr.Locklier (sp) was plain that these were nozzles installed on bodies and not FULL DD Jammer injectors. I haven't seen anything showing that there would be a change in the bodies. So far I have been very happy with my Jammer 4's.

As said in another post it is how much you use, not how much you have. The heat (egt in cruise) will actually drop relitive to stock or 275 injectors.

Randy

 

Not to hijack this thread, but I was about to do the same as mattn124. I, too, was going to go with the RV275's, but if I can get added performance for the same money, why the heck not! I noticed City Diesel sell the nozzles and the full injectors. Is the nozzle swap a DIY project? I know they have to be pop-off tested; where would you get that done? Is there much of a difference between the Jammer 1's and 2's?

 

I didnt even know you could just buy nozzles. I'm assuming that the nozzle is the tip of the injector where the fuel squirts out?? I've changed injectors on gas motors a few times but they all seemed to be just one piece,, but the dont have to handle the higher pressures our engines run on.

I plan on doing this job myself,, consider myself to be good with a wrench,, just new to diesels.. I've been looking into the injector swap and from what I can tell it doesn't look to be too bad of a job and could be done in an afternoon.

What is the advantage of getting the nozzles, and do you install them onto the stock injector? Is that a job that a guy in his garage at home can do and do right?

With my luck, I'll put the new injectors in and still have the truck do the same miss at idle,, hahaha
Thanks again for the help and for humoring a newbie like myself!
Matt

 

I would say probably not...if your not familiar with what your doing.
Yes...Tip go on your injector body. Main advantage is price. Many have had good short term results doing this...but I think longevity has yet to be tested. JMO.

Also need to have them tested/matched for pop off pressures at a good diesel/injector shop.

RJ