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Old 02-26-2012, 02:12 AM   #1
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water injection on a gas engine

I am in the process of buying a older RV 1984 with 454 chevy

And i am looking for a cheap water injection kit (water only)

Yes i know many will claim they don't work
I have run home made water injection kits out here in the Calif desert and under certain conditions they do work.

Out here in the Calif desert during the summer when the temperatures reach 110 and the humidity in down below 50% they work. Most of the time in the desert during the summer the humidity is below 10% where water injection works the best.

Many that have tried them and found they don't work live in high humidity areas where of course they don't work.

My problem is finding a cheap kit that is RPM controlled and does not sell a tank with it. as i can use the RV water tank.

I also plan to convert from carburetor to TBI fuel injection but likely will have to wait till i move out of Calif to do that as i have not found a CARB approved conversion kit.

All i can find are kits for small cars with turbo chargers and water/methanol kits for diesels.

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Old 02-26-2012, 07:44 AM   #2
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I'm a engineer that has done many cost analysis. If the system to save gas/money is say over a $100 the payback is so far out that it usually is not cost effective unless you drive a lot more than the normal RV'er.
Even the $10 I spent my ram air has a 3000 mile breakeven. And a $360 "chip" will take 22K miles to breakeven before you start saving.
Drive slower, hold your foot steady, get rid of weight.
But then doing the project for fun maybe the point....

Full Timers.
2015 Fleetwood Discovery 40E on a Freightliner XCS chassis with a Cummins ISL9 pulling 1 and/or 2 motorcycles, '07 Honda Accord OR a 17' Runabout Boat.
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Old 02-27-2012, 07:26 AM   #3
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Sounds like to me hes trying to save the heads on that 80s model 454, cool them down with that water.

Back when we had the 460, was looking for systems to help those heads & seems like I remember somebody had made one out of a high pressure RV water pump & motor, but dont remember how they controled the spray into the engine.
Theres several kits on the market, & I think JC Whitney had the cheapest one.
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Old 02-27-2012, 11:11 AM   #4
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Back in the day, we used water injection to kill the pinging when we advanced the timing.

Course in the 70's, gas was barely gas....
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Old 02-27-2012, 11:41 AM   #5
Join Date: May 2010
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Originally Posted by JimM68 View Post
Back in the day, we used water injection to kill the pinging when we advanced the timing.

Course in the 70's, gas was barely gas....
But it was gas without ethanol!
1999 Dynasty 40'PBS
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Old 02-27-2012, 11:46 AM   #6
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Inexpensive is a relative term for water injection.

Information, sources, etc that may be of some use to you.

Water Injection Overview
Water Injection How-To
Water Injection Installation

Do It Yourself Water Alcohol Methanol Injection


Install the injection nozzle in a plastic carb spacer under the carb.


Dave in Virginia
1978 Winnebago Chieftain
Dodge M400 - 440-3
Classic Winnebago Site: http://www.classicwinnebagos.com/forum/index.php
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gas, water

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