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Home > General Chat > coolingmist / aquamist water injection?????????

stevieturbo

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Northern Ireland

16th Jun, 2007 at 12:47:27am




On 15th of Jun, 2007 at 11:10pm TurboDave said:
Whenever i've had 'heat soak', by the time I've done my burnout, the temps are back to civility once again - do you not find this the case with your setup Steve?

If i had done absolutely everything else possible, then maybe I'd consider using mapped water injection...

However; in this particular case where a roots blower is being asked to make high boost (something it doesn't do at all efficiently), a re-think on the supercharger type, or at the very least intercooling is by far the best option before waterinjection. I think this is what BenRoss was trying to get across), and hence the 'band-aid' designation is quite apt (IMO).





I think highest intake temp ive seen, ( temp probe about 6" in front of the TB, mounted in stainless pipework ) is around 70degC.
This was at the end of a pass.

During a hard blast, my intake temps do generally rise, perhaps some 10degC or so, depending on conditions. During normal road driving, they rarely go much above 30degC though.

When racing its a different matter. Just not enough airflow to keep things in check.
Water/methanol injection is hard to beat at this point. Although Im using nearly 100% methanol.

But very true, if you are using this method, to try and reduce temps etc due to using a very innefficient compressor, well beyond where it wants to be used, then it is not the correct way to do things.

If using it as a further tuning tool, the is is very good IMO.

Always opt for an efficient compressor, good intercooling, then if you want to push further, WI or Meth is an option.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


slinkey inc

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Adelaide Australia.

16th Jun, 2007 at 03:14:05pm

Lots of people use it here is Aus (water/methanol, usally in 50/50 amounts, from what I've read) on older supercharger designs, eg. Carby, then charger, then motor. Which is what I run. There are much more effiecients ways of doing things these days, but people like me work with this older ideas as it's the only way they can afford to get into boosted motors.

I for one don't run W/M injection, don't need to, I only make around 7psi, with 98octane fuel, in approx 9 to 1 compression, not a problem.

But I know some poeple running smaller motors, giving a boost of around 12-15psi some more, and one of those (the designer of the charger kit I use) runs water/meth injection in his 1071cc (I think) race car.

Supercharged 1964 Morris 850 - Now 1330cc with 7psi.


Bat

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Bermingum

17th Jun, 2007 at 10:00:43am

Hi,
As with most things, there's a lot of different parameters to take into account.
1 What the vehicle is used for.
2 How much time / money you've got.
3 Space to fit everything into.
4 Ambient temps.
5 Engine specs.
and so on ...

As said above it should ideally be considered as a last resort, but if the points above are restricting you from the ideal, then your better of with it than without.
Cheers,
Gavin :)

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robert

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uranus

17th Jun, 2007 at 11:01:00am

looks like pros are ,

cheap
easy to fit ,
allows more boost ,
if injected b4 supercharger will increase the eff of the charger due to closing down tolerances
compact
simple if used single shot

cons
forget to fill bottle and check system works =detonation
not as much power as a good intercooler
you have to buy methanol if using a mix .

to add my 10 pence worth
i have designed engines to use water deliberately including it in the design ,for example , the v8 in the tvr was built using a high cr and lots of boost at some points ,and worked well giving a good economy and power per lb of boost ,but on the downside
when racing at the pod i used an adjustable valve contolling the flow of water ,and thought it was one turn out and 2 notches ,so turned it down at mid track by 2 notches ,not realizing it was really only 2 notches open ,and the engine immediately locked up and bent 2 conrods , so get it right and its great ,really stress the engine and have it stop worknig and it can be so quick to melt the engine you cant catch it .
incedentaly ,the ww2 fighters ,rally cars use it ,and so did f1. its simply a way to use a lower octane and get away with it .
and DONT get me started on corky bell !!lol

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM
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