Water injection on a 6CTA

[Mos68x]

Has anyone else ventured into the crazy and water injected their 6CTA yet? I know we have options for turning up the power in the IPs and other places, but I wanted something that would actually cool the intake charge since we don't have an intercooler on these engines. I would love to put one in, but I don't see any room to do that yet. If someone has please educate me.

http://www.thoroughbreddiesel.com/aem/water-methanol-injection.htm?gclid=CNyIv_Ls7tMCFQ9EfgodiGcKWQ

 

[Jericho]

I dreamt of turning the power up, figured all sorts of angles, BUT , after driving it for a while, It has all the power I need, just leaving it alone , maybe its old age creeping up, but find it still can go faster then prudent where its at sometimes. But Snow Engineering has some good h2o injection kits, Remember generally its used to "off set" increases in fuel and lower EGT while increasing charge density. Most of you will laugh , but I find my self just poking along at fifty, fifty five on the motorway , who would have thought !

 

[wreckerman893]

I recently flat towed a M818 while carrying another M818 on the back of my M927A2.

If it had pulled any better I couldn't have stood it. I was running 70 on flat ground.

Leave well enough alone.

 

[WillWagner]

Ever SEE what water does to the piston on a compression fired engine?

 

[98G]

When they fail, they fail *on*. This results in a cylinder full of water, which in turn results in catastrophic failure.

Too much risk, for too little benefit IMHO.

It amuses me to some extent - many people select these trucks based on their reliability, longevity, and durability. Then they immediately begin implementing mods that detract from these qualities.

Think about this - what does the truck fail to do now that even another 100hp and 300lbs of torque would allow it to do? (One possible answer - "destroy transmissions")

 

[98G]

Related thread -

http://www.steelsoldiers.com/showthread.php?150348-Water-Methanol-injection

 

[simp5782]

When they fail, they fail *on*. This results in a cylinder full of water, which in turn results in catastrophic failure.

Too much risk, for too little benefit IMHO.

It amuses me to some extent - many people select these trucks based on their reliability, longevity, and durability. Then they immediately begin implementing mods that detract from these qualities.

Think about this - what does the truck fail to do now that even another 100hp and 300lbs of torque would allow it to do? (One possible answer - "destroy transmissions")

Especially the people who already have problems with their trucks and know nothing about them immediately trying to get the "diesel power" out of it.

If you want more power out of your 5 ton truck simply put it in low range. If that torque isnt enough then you need an Abrams

Sent from my SM-G935P using Tapatalk

 

[Mos68x]

I dreamt of turning the power up, figured all sorts of angles, BUT , after driving it for a while, It has all the power I need, just leaving it alone , maybe its old age creeping up, but find it still can go faster then prudent where its at sometimes. But Snow Engineering has some good h2o injection kits, Remember generally its used to "off set" increases in fuel and lower EGT while increasing charge density. Most of you will laugh , but I find my self just poking along at fifty, fifty five on the motorway , who would have thought !

I agree, but I'm out in the mountains and climbing most of these at 35mph is getting really old, not to mention if I'm out on the dirt roads climbing around and have to stop, it is extra painful to try to get the truck into the turbo again while on grade. Besides, the extra fuel economy would be really nice since I'm at WOT nearly all the time.

I was running 70 on flat ground.

Must be nice, only time this truck has EVER seen 70 has been once, a long steep 8% grade. I can only get it to 55-58 on flat ground and that is at WOT.

 

[wreckerman893]

Must be nice, only time this truck has EVER seen 70 has been once, a long steep 8% grade. I can only get it to 55-58 on flat ground and that is at WOT.

What is your truck set at? The military often set the pump at 1900 RPM to keep speed down due to young soldiers with heavy feet.

Mine is turned up to 2300 and with the super singles often runs out of numbers on the speedometer.

You have to know how to drive a Cummins that is turned up. I usually back off the throttle a hair going uphill to keep from building too much heat.

There are times I'm still a "toad in the road", usually starting off uphill from a traffic light under load, but once I hit that flat land or downhill run I can stroll.

 

[red]

Water/methanol, propane, and NOS injection should be last resort installs. Start off with an EGT gauge then increase the fuel and adjust the turbo.

Some of these trucks had the fuel turned up a bit in the military, others did not. Prime example. A company near where I live has a m936 wrecker sitting on 11x20"s, and I have a m816 wrecker sitting on 395's. There is a hill on the interstate nearby where their m936 is maxed out at 30mph going up it. My m816 goes up it at 40mph if I keep the EGT's at 1150F, or 45-48mph if I don't watch the EGT's.

 

[Jericho]

I know AZ and Seligman well , love AZ but although you can gain some considerable ALTITUDE, In AZ your mountains your roads are well laid out and in much better condition than the 1523 (year ) goat tracks we use in the north country and don't seem as steep as the mountian roads here. I admit underload I can be less then top end on some climbs , but the roads are narrow and twisty , your roads are wide and straight for the most part unless your in a canyon. The beauty of the my 931 A2 is the trans modulation is spot on, it shifts up and down WELL within the power band, Its not a fire breathing loviathan ,but it runs well, Sounds like the guys may be on to something, Mine , unloaded, shifts into high between 50 and 55, and even on a slight up grade will continue to accelerate , far faster than I care to go, seems to feel a little LIGHT n the steering above sixty . Drive it for a while and get used to it, its a well proportioned drivetrain.

 

[98G]

I drove mos68x's truck today and formed some opinions. Here they are -

After having sat for an hour or so it fired right up and idled smooth. No indication of losing prime or of air in the lines.

It shifted well through all gears. Both when shifted to 1-5 and also when shifting manually. In fact, it shifted as well or better than any of the 8.3 trucks I've driven. It had no tendency to hesitate on upshifting.

It shifted at exactly 2000rpm at full pedal.

The thing is, once in 5th gear it stopped brisk acceleration. On level ground it stopped pulling at about 55mph and 1700rpm. This is atypical for the 8.3. Usually they run all the way up to 65-70mph and 2000-2100rpm.

Yes, I know his 20' bed is heavier, but that isn't the cause. I've towed 20,000lbs behind the 8.3s and not had them just stop acceleration like this.

I don't have an opinion of the cause. I throw my detailed description out here in hopes that someone else can explain it.

 

[74M35A2]

Check neutral max RPM, air, and fuel systems.

 

[silverstate55]

Install the custom replacement air filter from Those Military Guys; there will be a noticeable improvement.

 

[WillWagner]

KISS. Check easy things first, check full throttle, LOOK at the lever tab and make sure it is touching the stop. Make sure the modulator cable isn't adjusted with a throttle arm NOT getting full travel. Check FSOV pull in distance. Check low side fuel pressure, possible overflow valve problem.

 

[winfred]

my 5.9 6bt likes the overflow valve tweaked to mid 30# of fuel pressure running down the interstate which at idle is upper 20s, seemed to be the sweet spot, assuming the 8.3 and its little bit differently configured version of the bosch p series pump this may be useful info, the spring can be stretched a little, mine was missing the spring and ball bearing completely when i got the truck, scavenged a ball and spring out of a old mercedes pump from the core pile at the old shop and tweaked it

 

[Mos68x]

Thanks 98G, didn't notice till now that there was activity, I was busy fixing the spare tire and trying to get it mounted.

KISS. Check easy things first, check full throttle, LOOK at the lever tab and make sure it is touching the stop. Make sure the modulator cable isn't adjusted with a throttle arm NOT getting full travel. Check FSOV pull in distance. Check low side fuel pressure, possible overflow valve problem.

Ok, first...are you talking about the accelerator cam lever on the IP? If so I'll try to remember to take a look tomorrow when I'm trying to disassemble the next tire. Where is the modulator cable?

FSOV? Fuel supply overflow valve?? If so, where is that?

TM references would be greatly appreciated.

thanks guys.

my 5.9 6bt likes the overflow valve tweaked to mid 30# of fuel pressure running down the interstate which at idle is upper 20s, seemed to be the sweet spot, assuming the 8.3 and its little bit differently configured version of the bosch p series pump this may be useful info, the spring can be stretched a little, mine was missing the spring and ball bearing completely when i got the truck, scavenged a ball and spring out of a old mercedes pump from the core pile at the old shop and tweaked it

I have the MW pump on mine.

 

[Mos68x]

????