marine injectors

[Matt Bachand]

I've raed a gain of 30 hp for using marine injectors

Is this at the crank or at the wheels (where it matterS)

also, Do I need any more improvements to notice this power? (besides just seeing black smoke out my tailpipe?)

[94DieselPusher]

Everything I have read so far Matt is that marine injectors are not all they are cracked up to be and at 4 to 5 hundred dollars may not be your best bang for your buck

[rypie32]

I have just install marine injectors in my truck with no other 'performance mods', not a night and day difference but it seems to run really good-maybe a little more passing power. I haven't checked mileage yet, but seems to be getting more miles to the tank so far... (my first full tank) I think it is just like doing mods to a gas engine, if you take a stock 350 and put high lift valve springs in but have a stock cam, the springs aren't really doing anything beneficial, but once you put in a high lift cam, then they are doing their job. Kind of like marine injectors, if you are still giving it the same amount of fuel, you probably won't notice much of a diff. but open up the exhaust, more boost, give it some more fuel then the bigger nozzles of the injector can do it's job....sorry for rambling.

ryan

[Kevin B]

Hi I have been told to change my injectors only because the truck has 140,000 miles on it. They are the original ones, the truck is running well, no smoking, no power loss, no starting troubles. no night time bleed down that I guess worn injectors do, (no smell of diesel fuel in engine oil). The only thing I have noticed is a drop of in mileage by a mile or two/gallon. (this could even be from all the new stop signs, and extensive stops at traffic lights due to holiday traffic.

My question is has anyone who has done the injector change feel they got there 500 + dollar expense worth from doing them? I am being told to go with Marine injectors, for better mileage and more power, which does not make much sense how I can get more power using less fuel?

any thoughts would be greatly appreciated.

Thanks

Kevin

[Scrufdog]

your much better off getting a chip/PCM for the money. This should be one of the last things you do, and only if its time to change the injectors anyway

[DragNasty]

I havent done the marine injectors yet, but the better mileage may be coming from the fact that your replacing 100,000 mile+ injectors for new ones. May not be the "marine" part of it thats helping mileage. If I understand correctly, the marine injectors arent emissions rated, therefore they can spray more fuel than the stock ones. Maybe, thats where the more power comes in. Just my observation.

[TedReminder]

Mileage loss of 2 or so mpg can be attributed to winter fuel.
Ted

[snoddytn]

I have a 93 that has 200300 miles on it and I was wondering is there any use of getting marine injectors. If I get them and cranked up my injection pump would that be not good for it but I also have some exhaust work and intake work done so I don't know if it would level out any

[Garth J]

If you havent changed the stock air filter you will still have a restriction go to the ssdiesel intake that will make a huge difference.. Check out the fan upgrade too ...Garth

[jimirwin]

I have lots of experience rebuilding engines...all gas. NONE with any diesels...yet.

Walt told me I was on borrowed time with the original injectors at over 150K miles. So I bought the marine ones for the promise of better fuel economy and performance, both.

I need to know any/all tricks and tips for R&Ring the turbo (Seems the gaskets come with the injector kit ... thanks Walt, nice touch!).

Seems also that I'll be purging air from fuel lines upon starting after the change. Yes? Anything to watch out for? I'd feel a lot better with some good illustrated instructions.

Thanks!

Jim Irwin
Austin, TX

[rypie32]

I have lots of experience rebuilding engines...all gas. NONE with any diesels...yet.

Walt told me I was on borrowed time with the original injectors at over 150K miles. So I bought the marine ones for the promise of better fuel economy and performance, both.

I need to know any/all tricks and tips for R&Ring the turbo (Seems the gaskets come with the injector kit ... thanks Walt, nice touch!).

Seems also that I'll be purging air from fuel lines upon starting after the change. Yes? Anything to watch out for? I'd feel a lot better with some good illustrated instructions.

Thanks!

Jim Irwin
Austin, TX



yeah, I just did the same thing, not that bad of a job. As far as the turbo, take the four mounting bolts on the turbo off, and the two that hole the oil return line. I've heard of guys that take the oil line off the turbo, but I left it attached and just flipped the turbo onto the intake-sat there just fine. Leave the red caps on the new injectors until you are ready hook the lines back up. Torque injectors to 50 ft/lbs. When bleeding the lines, hand tighten and then give it a little more with the wrench, (go by feel, don't tighten it -I put a little tension just in case air was drawn back in to the line. If you think it is to tight back it off until you can feel the nut "loosening" if that makes sense) anyway then I rolled it over for about 20-30 sec. (I was by myself) then grab a flashlight and look at each injector if each one is wet, then fuel is being pushed out, thus most of the air should be gone. I didn't bleed the back three on the pass side, because they are a bugger, and because I forgot to do it before I put the turbo on :) it worked fine any way. Then I tightened the lines, and fired it up. I let it run for 20 mins or so, it will probably run rough for a couple minutes til all the air is purged. As far as what to watch for: Dont' bend the injector lines, just gently move aside. The back pass. injector is a pain, I took the pass. inner fender out not as bad as sounds, took maybe 10 mins it helped alot with removing turbo, injectors. Then I installed the pyro while it was torn apart, very easy this way! hope this helps and good luck

ryan

[Garth J]

the lift pump will supply fuel to the injector pump so make sure it is working properly. Just crank it over (dont heat up the starter) it will run after a few cranks probably rough but it will start and the fuel lines will self bleed.
It took mine about 5 minutes before it ran smoothe after replacing the injection pump..

[jimirwin]

Ryan,

Thanks! This is probably enough necessary encouragement to forge ahead weekend after this.

What's the pyro?

Jim