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MG Midget and Sprite Technical - water injection

Just been reading some stuff on water injection for car engines. Does anyone know if this has been tried with the A series?

Steve
Steve Church

Steve, I was 'playing about' with water injection nearly 30 years ago. It does add some benifits, but unless there have been some massive advances since then, I would say it's not worth the effort....

You will notice that weather conditions, especially Fog, improve the running of a car engine, it is the same effect for water injection.

Mark.
Mark Boldry

Years ago, when Mum first had her midget in the early eighties I remember mg spares and Services at Beech Hill near Reading used to sell a generic system for fitting to MGs.

I know my cars runs beautifully on cool damp mornings.
Jeremy Cogman

....I believe such a system was fitted to Spitfires [planes not cars...!]
dave c

Cant say I've noticed so much in the Midget -but my impreza is very noticably more eager in fog or drizzle.
Dean Smith ('73 RWA)

Perhaps I should fit a shower under the bonnet!
Steve Church

A guy I know tried it a time or two at Castle Cpmbe test days on his sprite and he said it pulled better, his system was a washer pump and nozzle spraying into the carb IIRC.
David Billington

it's more often used on turbocharged cars, it allows very high boost as it provides additional charge cooling as a side benefit.
David Smith

Yep my FTO likes the damp fog too. One foggy winter morning I put optimax in and drove off. the two combined felt like they were worth another 40hp!
Nick

Didn't Arnold put water injection on his blown Sprite?
Mark

I have beeen going down the hydrogen road myself, have a system on the boards i have been kicking around for over a year, I think water injection would be better as a tuner for EFI engines useing hydrogen to do a hybrid.

the thing you have to watch when using water injection (more so then hydrogen) is (oil delusion???) over time the oil is broken down in the top of the clyinder and it will change the chimistry of the metal making it harder with a cast effect....so the top of the clyinder gets more brittle and will eventully spider wed....but this takes alot of time from the reading I have done

to get the full effect from water injection, I think you have to get it into an extremely fine mist....I think thats why on EFI engines where its just droped in the back of the intake as small water drops it will atomize much easier and faster getting finer as it mix's with the fuel/air mixture

to get the best effect IMHO on a A-series would be to make some Maniflow intakes manifold that are longer and narrower to increase the atomization better of the water andsome way to meter the water to add more during higher engine revs.


prop
Prop

Yes I did have WI on my supercharged Sprite. It works, but I must say I put it on because my air inlet temps were as high as 95C! This resulted in pinging and even worse resulted in a erratic fuel injector (I run EFI).... Water injection was turned on with a pressure switch, switching on a washer pump via a relay. One could see the airtemp drop 20-30C within a second. But in order to lower the inlet temps on a continous base I finally chose the intercooler. Don't aske how much work this is (still working on it)


http://www.kmnet.demon.co.uk/arnold/

PSPS the nozzle s the most important part, Mc Master
Arnold

This thread was discussed between 03/06/2008 and 04/06/2008

MG Midget and Sprite Technical index

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