Water injection??

[Anonymous]

Why isnt this more popular. Does anyone know if it has any bad side effects like rusting the exhaust system inside?. If the claims are true it must be good (for running higher comp etc). They give no idea what compression can be run. Has anyone tried it with a Ford six? Would anyone like to take an educated guess at what comp could be run?
Does increasing comp ratio from 9:1 to 10.1 increase power 10 percent, how do you work out the increase?
I was thinking about the option of running the higher comp ACL pistons for the 200 rods. I know the dished ones were 10:1 comp and the flat tops 11.0 something. Might be worth doing if I could run the higher compression with the water.

 

[xctasy]

AICH TOO GO.

A vast amount of info on it Tim, but it only workes when an engine has been built with a static and dynamic compression incompatable with pump 'petroleum'.

It will reduce top end power in a wide open throttle, but allows part throttle economy and torque to increase, and extra advance to be dialled in without detonation setting in. So your 95 Super only 250 could run 91 octane with just a small set of twin 15 thou jets spraying water with a electric motor. David Vizard speaks of 12.5:1 compression on regular gas with water injection, and excellent part throttle economy.

The exhast valves cop a hammering from H2O. The steam raises the exhast guide and valve temperature, as well as the peak cylinder pressures. So water is not a cure-all, but very good if you are trying to make a hi-compression engine work on the street.

The trick is to spike it with something that makes power as well as stopping detonation, like 50% ethanol or methonal.

Just make sure you go to your local police station and declare it. With the rampant onset of meth and P being made at home in illegal bootleg laboratories, straight water lookes like a good option.

 

[Anonymous]

I have run it.
Back in the '70's during the Arab oil embargo.
Mine was an Edelbrock unit that I had on a Dodge 440 Magnum. It allowed me to keep the car on the road when the supply of Sunoco 260 dried up.

I got 17mpg in a '68 Charger with an automatic and 3.91 to 1 gears. Not bad at all. I ran it like that for about 40,000 miles before I sold the car.

John

 

[Anonymous]

I like to run water in the summertime, when I don't have to worry about the frozen water bottle..

I just stick a large-diameter syringe (16-20 gauge) into a vacuum line that goes to manifold vacuum, then hook up a clear hose from the Pepsi bottle (1 liter size) to the syringe. It starts better in hot weather, probably because the leftover water in the intake helps lower the heat soak issues. It also runs smoother and gets better MPG. I didn't notice any loss in power, but with EGR running, it's often hard to tell.

I usually run the EGR in the summertime because it lowers combustion temperatures and reduces underhood heat. In the wintertime it can make the engine run too cool, and my tootsies shiver on the way to work.

 

[FastRonald]

8) First...........use windshield washer fluid. It rarely freezes and it has alcohol. I set ours up using vaccuum and it works very well. No pumps, no motors and simple.

 

[61Futura]

Manifold vacuum would be a poor choice since you need the water when the vacuum is low & don't need it when the vacuum is high.

 

[Anonymous]

one thing to keep in mind, due to the bottom end design of the 250's (not sure on the 221's and 200's)

having a static compression ratio greater then 12.1 to one you will actually loose power,

going to 12.5 to 1 will see you drop 15% in power!!
it comes down to the mechanical advantage of the bottom end not being able to force the piston up the bore well enuf, so in theory you are effectivly decreasing ur stroke available to you.

dont take the c/r above 11.5 and you will be sweet.

cheers.joe.

 

[Anonymous]

Well, the reason I use manifold vacuum instead of port vacuum for the water is to also help cool it down in the long traffic lines Denver has grown. We're now honored to be the 3rd worst traffic in the country...

When I head for the mountains, I sometimes switch it over to port vacuum just to experiment. It doesn't seem to decrease the extra power, but it saves a little water over running it to manifold during the long downhill descents, which do tend to use the water up for no good reason. It definitely cools it down during the long, WOT hill pulls at 55-60MPH. Those same hill pulls are 50-55MPH when the bottle runs dry, so it's always easy to tell.

 

[61Futura]

I was considering water injection and how to do it for a short time, but then something has gone wrong with my engine that I haven't been able to fix yet. I believe my ported vacuum is much lower than manifold vacuum. If you are using the same size injection nozzle between the manifold & ported vacuum, maybe you need to increase the nozzle size or raise the water bottle so you get more water into the ported vacuum line.

I had started making a plan that would use a pump that would wait for the engine to warm up first, and then start injecting water when the manifold vacuum dropped below a level to be determined, and increase the injection rate according to the loss of manifold vacuum. I also wonder if the water needs to be atomized or if the temperature of the intake manifold is high enough to make that not necessary. It would be a shorter path to the inside cylinders and may require a fogger type injector to get the full benefit of water injection. The idea of water injection sounds good, but how to get it done right is still a mystery to me. Buying a manufactured unit would be simpler, but that would be admitting defeat. And then if it didn't seem to do much except use water, I'd feel cheated. Being a cheap skate has its drawbacks.

 

[Anonymous]

Okay I've heard of this before and I now know some of you use it but how? I mean, do you guys have any pictures. Sounds interesting.

 

[FastRonald]

8) Our six shooter runs fine at top end.........it's the low end to mid range we want to water injection to function. Smoother idle, quicker low end response was our goal by using vaccuum.

 

[FastRonald]

8) I'll clearly need to increase the vent inside diameter. The vaccuum draws very well. but could benefit from a larger opening than the current size. The car seems to love this arrangement.

 

[FastRonald]

8) We may do the battery to the trunk thing soon. That would give us the chance to weld up a tank and take the vapro injection using vacuum to the next level.