Water Injection Kit

[arnott1t]

Well Its been some time since I have posted on here. The turbo I installed on my 81 BJ42 is still functioning great. No problems so far. We have probably put 30-40000 km on it since the install. Now as a fourth year project I plan on building a water/methanol injection system for it. As it sits now I expect to have all the parts ordered in the next week or so and we will be installing it later next month.

I have sourced a 24V pump through a local aag store and have bought some of the required other doodads such as a shut off solenoid. Still need to find a 1-25 psi pressure switch and mock up a tank. The pump we soucred is a 1.6GPM 45psi internal bypass unit. The pressure seems a little low but I think we will be able to adjust the bypass to get the pressure up some and the flow down. If not I still believe the 45 psi will be enough injection pressure. I will of course included pics as we move along and also try and provide some results.

We are currently looking for a chasis Dyno so that we can put numbers to both the turbo and water injeciton system gains. If not a friend has a G force meter that is supposed to be accurate to within 2hp. He has said that it is really accurate when there is minimal wheel slippage. This shouldn't be a problem.

We expect the price of the set up to be around the 200$ range but might nickel and dime our selves a little higher. We hope to see about a 200f drop in EGTs at a set fuel level. this will allow even more fuel to be added.

Thought some of you might be interested......

Tyler,

 

[brownbear]

Sounds very interesting and very different.

How come you decided on water meth rather than Propane injection?

Any fear of screwing up and causing severe damage?? I dunno.

 

[arnott1t]

My understanding of propane is that it is simply another source of fuel and provides power that way. I'm not sure how it affects EGT's or anything else.

In the research that I have done my understanding is that this is difficult to harm anything with. The water acts as a chemical heat sink. It absorbs massive ammounts of heat by changing from a liquid, in tiny droplets, to a gas. This change of phase suck up alot of energy. Adding to much water will restrict your flame front and reduce power. In this case there is still no risk for damage but you will notice a lack in power.

We plan on starting with lower injection rate and slowly raising them to see what gains or losses we make. It should be noted that we are injecting post turbo. Injecting pre turbo may appear to be easier but can and will cause serious damage to your compressor blades in the form of erosion.

The methanol added acts as a catalyst of the combustion by allowing the diesel fuel to be burnt more efficiently.

I will be taking my time and I think I have covered most of the angles. I too am suspicious of the results. This is one of the to good to be true things. We'll just have to see how it does.

Tyler,

 

[cody c]

sounds cool, definately get dyno or g force results with this build, if the #'s really are good then i might jump on the boat as well.