Contour Enthusiasts Group Archives Forums Modifications Duratec Performance for those that ran 100 shot;will water injection benifit nitrous?

for those that use or used a 100 shot was there any precautions that needed to be taken or can I just change jets also I have a zex kit so were would I get these jets?

basically the topic sums it all up. if I understand correctly water injection eliminates detination which would allow for use of a bigger shot. maybe?

Water injection works best when used with hot compressed air... I don't think you would benifit from water injection as much as a forced induction (SC/TC) car would.
-Mark

didn't think so terry just said somthing about it working on jigh compression engines and extreme timing advances a while back.

anyway how bout those that ran a 100 shot could 125 be posible without dropping the compression timing retard only

I'd think that if you ran water injection and Nitrous you'd be shooting itty-bitty ice cubes down your intake

The perfect compression ratio for nitrous is 14:1. For high HP nitrous uses you are going to need a direct port system and better/stronger pistons possibly rods. Also you will need to inject nitrous AND fuel separately from your injectors (wet system). Large doses of nitrous are safe if you prepare for them.

Now water injection and nitrous ... Back in the day I had a 2.3 turbo merkur xr4ti. I ran water injection with that (no intercooler on the xr) and a large shot of nitrous. I accidentally left the water injection turned on WITH use of nitrous. CERTAIN DEATH was the first thing that entered into my mind, but suprizingly it worked nicely together. Now nitrous and water injection without boost? I have NO personal experience so I can't give any advice. Just remember water freezes and EXPANDS. Nitrous gets VERY cold when it goes from liquid to gas.

maybe i am having some sort of brain fart... but i thougt in order for something to go from a liquid to a gas it had to be heated, not cooled. just thought that was CHEM 101, like i said, i could be having a brain fart.

You missed the principle upon which air conditioning is based. When refrigerant is suddenly expanded when it goes from a liquid to a gas in the evaporator core, the core gets very cold. The air rushing past the core is then cooled.

Jim Johnson
98 SVT

Water injection by itself can create additional horsepower. The expansion of the water as it suddenly becomes steam generates a lot of pressure. Aircraft jet engines with water injection (called "water wagons") have a tremendous boost as long as the water lasts. One pilot told me that the drop in power is so dramatic that you think that the engine has stalled. Such systems help with high load take offs from high altitude airports.

Water injection in a car engine is very hard to regulate and difficult to meter in enough to make very big power gains. Often it does more to cool the intake mixture (making the mixture denser similar to the effect of an intercooler) as well as cutting engine ping.

The 62 Oldsmobile F-85 with optional turbo had water/alcohol injection to prevent the engine from pinging when it was under boost. The waste gate would open and not allow boost unless there was fluid in the bottle.

Several years ago there was some study about eliminating EGR valves by using water injection to keep the combustion temperatures below the level that generates NOX. It worked, but it just was not practical.

Overall, there has really never been enough gain from water injection to warrant the developmental costs to optimize it. Nitrous injection is much more controlable and provides so much more power because of the additional oxygen that it provides.

Water injection can also cause accelerated cylinder and ring wear when used in heavy doses as well as problems with engine oil if it doesn't have special additives to deal with the additional water that can end up in the crankcase.

Like a lot of things, a little may be a good thing, but a lot may be more trouble than it is worth.

It pulls all the heat from the engine. Relative to liquid N2O, it's pretty damn hot in the intake/engine.

Jason's right about the direct port injection. The other reason that would be much better for our cars, is because our intake is not meant to have fuel running around in it. I would imagine pools of fuel that sit in the runners that evaporate later on. The best way I think N2O should be run on the Duratec is to either have straight-through jets shot down through the upper intake, or side-shot (90 degree spray nozzle) in the lower intake. This would make it more expensive since 6 nozzles are needed, and more complex to make.

Remember Puff? That had a single dry nozzle, and they ran a 100 shot. Kept popping stuff if I remember. Halfshafts?