Water Injection Wizardry

A water injection system can improve your gas mileage 20 to 50 percent.


| September/October 1979


During the second World War, fighter pilots could push a button and inject a stream of water into the turbochargers of their monstrous powerplants to get extra thrust on takeoff. Some time later, Chrysler (among other auto manufacturers) installed water injection on a number of its large displacement engines, again for a performance increase. Indeed, water injection—used to produce power increases—is nothing new.

But using "Adam's ale" to save gasoline sure is a change of pace! You see, until recently there just hasn't been any way to effectively control the volume and atomization of the tiny amount of fluid needed to adapt H20 injection to a small, economical engine. And typically enough, while big technology has failed to figure out how such regulation could be handled, a small back-lot entrepreneur (with a wealth of experience and ingenuity, but a paucity of dollars and degrees) has succeeded.

Pat Goodman installed his first water injection system (on a Porsche racing car) in 1964, and the racing organization responded by banning his device—it made the vehicle too fast! Undaunted, Pat decided that even if the racing establishment wasn't interested in "improving the breed," he was.

Today, several near-bankruptcies later, the innovative mechanic owns a vehicle that only the government could argue with: a 1978 Ford Fiesta that gets 50 MPG in normal around-town driving. (This impressive figure has been verified by a MOTHER EARTH NEWS staffer, who accompanied Goodman on a 48-mile jaunt around Winchester, Virginia. During the drive—which Pat accomplished with, if anything, more speed than normal—the small four-cylinder sipped only 0.95 gallon of unleaded gas.)

Back to Basics

Like most good ideas, the Goodman water injection design is an amazingly simple approach to a frighteningly complex problem. In fact, the production system is much less complicated than the prototype model. It consists only of an atomization nozzle, plus two one-way valves from squirt guns, some hose (to supply water to the "sprayer" and draw pressure from the emission system), and a one-gallon water tank.

The nozzle is screwed into the top of the air cleaner housing and sprays minute droplets of water into the carburetor throat in response to orders from the engine's stock smog-control devices.

race'intom
12/24/2010 10:11:41 AM

http://en.wikipedia.org/wiki/Water_injection_(engines) -----and links gives the good low down on h20 inject---funny they dont make much of the fuel savings that could be possible though around 25% looks obvious from the reading and the h20 inject dosent need(you dont want it to) to start til around 3 or 4k rpm or so which should help with metering//// generally speaking lean the carby and bump up the timing a few degrees----will try to give a more specific example later-- am going to experiment with a 86 350 chev engine in a 1 ton van getting around 10 mpg now i have already unrestricted the carby cover(stock was bad restricted and caused the motor to run alot hotter) and that added about 50-75% more power i didnt measure fuel use before but i'm sure it added 2-3 mpg( I forget the % but quite a bit of fuel on pre computer controlled ignition autos goes for knock prevention ---combustion cooling...thats why you get the big improvement in mpg on the newer setup--it runs leaner--- but when you get the newer repair bill that doesn't/ may not mean money saved --funny how that works--or is it----hmmmm sez da hillbilly


race'intom
12/20/2010 4:14:53 AM

What happens if you add more h2o than the 95% gasoline to 5% h2o ratio??? Seems adding light oil or diesel to the gas tank might be a good idea----which i do anyway If i recall correctly i read somewhere it is good to have the h2o close to boiling when it is injected---any thoughts there?..Also cause of the h2o cooling effect i should be able to lean the carby some. What would happen if you did this on a diesel motor---blow it up maybe??? Truckers add 4-5% gasoline to race'in diesels fuel..Got a gas guzzler 350 stock chey engine on a 1986 motor home - anybody know the compression ratio off hand? any mileage or tips appreciated. Tks---I plan to add a trailer w a couple of wood gasifiers also and have a duel fuel sos i can actually travel some. Tks Race'inTom


Brian Rich
12/8/2010 6:05:32 PM

I have a 1977 ford thunderbird with a 351w. 11:1 compression ratio. I run a holly 600 and my own water injection kit. My kit I purchased from the aquarium section at my local dept store. useing clear tubing, air stone, airline regulator. I was able to increase my mileage with 93 octane fuel @19 mpg.. With h20 I down graded to 87 octane and increased my mileage to 26 mpg. Thats great for a 4400 lb car.






mother earth news fair 2018 schedule

MOTHER EARTH NEWS FAIR

Next: April 28-29, 2018
Asheville, NC

Whether you want to learn how to grow and raise your own food, build your own root cellar, or create a green dream home, come out and learn everything you need to know — and then some!

LEARN MORE



Subscribe Today - Pay Now & Save 64% Off the Cover Price

Money-Saving Tips in Every Issue!

Mother Earth NewsAt MOTHER EARTH NEWS, we are dedicated to conserving our planet's natural resources while helping you conserve your financial resources. You'll find tips for slashing heating bills, growing fresh, natural produce at home, and more. That's why we want you to save money and trees by subscribing through our earth-friendly automatic renewal savings plan. By paying with a credit card, you save an additional $5 and get 6 issues of MOTHER EARTH NEWS for only $12.95 (USA only).

You may also use the Bill Me option and pay $17.95 for 6 issues.

Canadian Subscribers - Click Here
International Subscribers - Click Here
Canadian subscriptions: 1 year (includes postage & GST).


Facebook Pinterest Instagram YouTube Twitter flipboard


Copyright 2018, All Rights Reserved
Ogden Publications, Inc., 1503 SW 42nd St., Topeka, Kansas 66609-1265