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Old 02-03-2011, 10:23 PM   #1
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Question water/alcohol injection on 454 v8 carb

I have a 1989 chevy 454 in a Fleetwood Southwind. I just got it and am trying to improve engine power and economy. I've read a lot about water/alcohol injection, all positive. But a carp rebuild specialist (Cliff's performance shop; reccomended by some of you on 454 thread) says No.
Have any of you had any experience with it?

Thanks Folks!

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Old 02-04-2011, 05:37 AM   #2
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Injecting water into a running engine will not improve power or economy.
If the engine is prone to pinging (spark knock) it will get rid of that.

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Old 02-04-2011, 07:36 AM   #3
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Not sure what your trying to accomplish here- do you have some knocking or pinging you are trying to remediate?
GM makes a "Top Engine" cleaner that when used can help with this, also I have used "SeaFoam" which you can get at Autozone with good results. Both of these get administered thru the card or a vacuum line. Good luck.

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Old 02-04-2011, 08:21 AM   #4
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it will only help for pinging back in the late 70's i had a 1970 chalenger with a 440 the compression was high i added water injection it was vacuum operated. my southwind 454 gets 8 mpg pulling a 4 door chevy truck (thanks to Jim's distrubitor mod)
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Old 02-04-2011, 09:24 AM   #5
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Bill, start reading Jim E's post and do what he explains. these engines need to be hot rodded, that's what they like the best.

John & Colleen Weston & Cassie(our cat) -Olympia,WA
1978 GMC Midas Class A 30FT-454 Engine, 400 T
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Old 02-04-2011, 09:32 AM   #6
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Many years ago I purchased a Holly water injection unit for a Chevy 350. Tried to use it one time and removed it. Junk!
'98 Gulf Stream Sunsport 325, 7.5L Banks Power Pack, Koni FSD's, Air Bags, ReadyBrute Elite,
2000 Honda Accord

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Old 02-05-2011, 09:01 AM   #7
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Gentlemen, thanks for your advice. I'm convinced I don't want to do it. I had been told(by people who sell them) that they would increase power, and make your engine run cooler. Thanks again, you've saved a lot of money.
Bill Hardy
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Old 02-14-2011, 09:34 PM   #8
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Bill I have an '87 GMC Suburban with a 454. I am a believe in Marvel Mystery Oil. Been using it for years and get good mileage and good performance. 105k plus and no mechanical issues at all.
Klamath Falls, Oregon:The Right Side Of The Cascades!
1990 Rexhall Airex 29I,Ford 460cid,Gear Vendor,Granning Tag Axel
'87 GMC Suburban 2500 W/454 CID
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Old 02-16-2011, 02:45 AM   #9
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A water/alky mix is used mostly in aftermarket boost set ups to keep things from detonating at high boost and melting down.

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