I took my 99 Cummins to the track this weekend & used my H2O inj system for the first time & it was shooting ducks the entire time the systme was on. it sounded like it was poping in the exh, but it was hard to tell. I got out of it & just cruised through the lights (1/8th mile track).

what causes this?? too much fluid? not enough Meth??

thanks
Bob

 

Its something that I pieced together, so there is no "kit" something.

I flowed it in my Garage with 12V & it flowed about 650 cc/min with no pressure against it (just into the sink), I would guess that it goes down when you have boost pushing against the injector.

IIRC, it kicks in @ 24 Lbs & then back out again about 20. the truck runs @ 30 Lbs @ WOT, so it should be on the entire time Im laying into it.

It has the Edge Stage 1, 50 HP Injectors in it. a Blue Chip Diesel replacement VP44, no muffler but still has resonator, boost turned up to 30 Lbs via spring & turnbuckle.

thanks for the input.

Bob

 

either injecting too much or injecting too soon

 

water / meth can be tough on head gaskets because of pressure spikes in the cylinders. make sure youre not running too high a concentration of methanol and confirm the amount of fluid that an off the shelf kit puts out over time, just to be safe.

 

what kind of nozzle are you running? might not be atomizing enough, just dumping in the intake. im running over 2000cc through mine kicking on at 15psi. no problems at all...

 

Too much Meth or the nozzle is not atomizing are the too biggest reasons for the popping.

What ratio are you using?

What size nozzle(s) are you using?

What is the injection location?

 

I dont know what the % is. I guess I need to find a gallon of Meth & mix my own. I understand most folks are running 50%, is that what your running Andy??

I dont know what the "size" is, I flowed it & mesured how much it was flowing @ WOT, with no pressure, I would imagine with 30 Lbs of boost pushing againts it, its less than that. its a snow injector plumbed into the intake in the curved piece right ahead of the "manifold".


thanks again folks
Bob

 

Using Washer Fluid or what?
That stuff works well. Mixing your own at 50% is even better, if you have o-ring and head work.... as mentioned.
WHat kind of nozzle?.... worth trying it turned up to around 25 psi.
Do you have a 'controller' or is it full on, all at once?

I don't supscribe to the "reduced flow under heavy boost" theory. Not my experience... going from 40 psi single turbo to 65 psi twins.
I still go through a gallon of H2O/Meth every 8-10 1/4 mile passes.

RJ

 

The Members are giving you very good advice on what your problems might be on the "popping" or "shooting ducks" as you said.

I have been running water injection on my 1996 Dodge CTD 12 valve for over five years now. I had started with an early Snow System and now have a Scheid Water Injection System. As the Members said, you are either getting too much water in there, the location of the nozzle(s) is off, and/or the injection boost/timing is off. I would suggest backing down the size of your nozzle(s) and increasing the boost points when you have the water come on,
and when it is full on. Then when you get the system to a point where the popping stops, work your way up from there. With a homemade system, it will be a little harder to do, but it can be done.

Good luck Sir.

--------
John_P

 

how much pressure does your pump have? if its to low it will dribble in and load up on a few cylinders. take your pump psi - boost psi = spray pressure. i believe it should be at least 50psi over boost pressure...

 

thanks for all the suggestions guys.

Sorry for not answering, yes its washer fluid. @ my local Kragen I had 1 choice. it says "cleans and protects to +32F". Here in San Diego, Kalifornia, there is not much concern over it freezing so there are not many choices. If I cant find the Meth I will swing by NAPA & see if they have other choices for me.

Its pretty much a stock truck with the exceptions of what I have listed in the 2nd post. for the most part Im just goofing around with it. I have not done any crazy mods nor do I intend on it, its a tow truck for my racecar. I just wanted to see what kind of HP/EGT changes I would get with it.

When I flowed the system on my workbench, I neglected to hook a pressure gauge to it so I dont know what kind of pressure its putting out. it was coming out @ in a real nice spray & it had some velocity to it. it all looked reasonable.

as I mentioned I only have the one nozzle & have considered buying another one, but dont really want to spend a WHOLE lot of money on something Im probably going to rip out of the truck & put into the race car.

I bought one of these adjustable pressure switches from Cooling mist & am turning the pump on via a relay (mounted directly above the CL of the pump in the picture). IIRC it comes on @ 24 Lbs & clicks back off again @ about 20Lbs. I used my compressor & a presure regulator to configure it, pretty simple stuff really.


Here is the location of the nozzle. the fitting to the left of it, is where I get my boost pressure from for my Mech boost gauge.


Here is where I have my inj pump mounted. this is where the horns used to be. the horns are directly below the pump now.


Here is where the Horns are located now.


Here is where the water bottle is mounted. the aft bracket was easy, just a 90* bend & up it went. the forward bracket has all kinds of twists & bends in it so that it mounts to the front of the battery box to give it a little flex strength into the engine compartment. it works pretty well & is pretty solid. easy to fill & nice on the eyes.


thanks again for all the help guys.
Bob

 

PS, John, Please dont call me Sir. My dad is Sir. ROFLOL.

Bob

 

I think the grid heater is "collecting" the mist and turning it into droplets. and the meth is not helping any. try pure distilled water once and see if the popping goes away. I know John and myself can not run meth in our " little" systems due to popping out the exhaust.

 

--------------------------------------------------------------------------
Bob:

My apologies to you on that! It is "force of habit" for me after being in the military and then 25+ years in law enforcement.

---------
John_P

 

If you are running washer fluid bought here in SoCal it won't have any meth in it. The stuff you wrote about says right on it +32 degrees, this is above freezing so no methanol. If you care to try some methanol you can buy it from Dion and Sons in Santee on the south side of the 67. Eric