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Old 03-02-2009, 11:09 PM
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Water alcohol injection questions

Hey everyone,

Well the blower project is going pretty good but it looks like I wont be using E85 as I planned. The gas stations around here that where selling it went out of business.

I'm leaning to water injection. My question is tuning with carburetors. I'm using 2 predators and was wondering how the water/alcohol would affect the tune? The Predators are set at about 13:1 but when the water/alcohol is injected i would guess it would bring the A/F ratio in the range of 12:1???? I was hoping to use one of the cheaper on/off kits and set it around 6-7psi.

I plan on running about 30% alcohol to 70% water (washer fluid) and about 10-12 lbs of boost with a compression ratio of 9.3-1 Its a 383 Chevy, vortec heads .037 quench XE 274H Cam with 1.6 roller rockers.

Lets here what you think.

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Old 03-03-2009, 11:15 PM
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You would be better off lowering your compression than running water injection. If you want to fool with water injection later thats fine but running high compression with a blower is never a good idea and you can always up the drive ratio later.

What you are proposing is a band aid fix for a problem you can easily fix before you have the problem.

Didn't we have this discussion about gasoline and alchohol in an E85 thread before? In case it wasn't you, here's a synopsis.

They are two different fuels, they mix...but under heat and compression react differently in the chamber. They burn at different rates and no matter what you do its impossible to tune for both at the same time. Adding water to the mix is just another variable you don't need.

To make a long story short you don't want the hassle, build it for one fuel properly to begin with. If you need some water injection later to cure some high boost condition on the track thats fine. The alchohol is there only to keep the water from freezing, its not there to add octane.

Don't make a simple situation complicated, lower your compression. $300 worth of pistons and rings is way less than the hassle of getting some Frankenstein injection system dialed to work everyday in different temps, humidity etc.

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Old 03-04-2009, 11:26 AM
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I agree. water/meth injection (or for that matter, any injection; propane, nitrous, octane booster, etc) is great for race, but when you're out on the road and you run out of water while climbing a hill, you are done. It doesn't sound like a hassle, but it is. Then there will be that one time when it stops injecting because the pump failed, or the hose got that white bacteria in it, and you're beyond just stopping at the mini mart; you're done until you repair it.

Anything you have to add to compensate is a band-aid fix.
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