Deep Singh

Learnt recently that people are using a 50/50 mix of methanol and water for WI.Is this applicable for the IC spray aswell?

nom

Can't see there being any point? Other than possibly eventually corroding the ic?

Deep Singh

Hi Nom,then why put it in the WI? I can only assume that methanol has a higher latent heat of vaporisation and hence absorbs more heat per gramme vaporised.Alternatively I could be talking cack which I often do!

Andy W

Wouldn't methanol also lower the freezing temp of the water, stopping it freezing?
Both sound like good reasons to me.
A

StanS

iTrader: (3)

Been using <10% methanol in WI to stop freezing.
Apparantly too much affects flame front (?)during combustion - or is this fluent billox ?
Wasn't there a big thread on this before Xmas ??
Stan

Deep Singh

Actually that does ring a bell.Problem is I'm always about 6 months behind any major topic! Anybody got a link to that thread?

nom

OK, no link, getting info from ye olde booke instead...
Water injection:
"The OH group precipitates corrosion of the piston ring lands, the piston rings & the bore wall by removing lubricant." That is, apparently, for anything much over the amount needed to stop the water from freezing. Which is preumably around 10%?
No mention about sticking it in water spray, though - and I'd have thought if it was beneficial, it would be mentioned! Good nozzles, that's what you want

Meths is good with roots type blowers. If you were thinking of adding one of those

nom

Oo, Stan - just read your bit . Methanol burns more slowly than petrol, so is good for anti-det (and can presumably therefore increase power if you map to take the slower flame-front into account).
But too much promotes det.
And does other nasty things.
So, good in moderation, then.
A bit like beer.

Katana

My only qualms with methanol is that its expensive and the effects are marginal for the water spray. Water is free.

scoobyslut

would it not be far cheaper to simply run the supply water hose to the cooler spray jets around the air con cooler hose a few turns "en route" up to the bonnet jets, thereby cooling the water when it needs it most, as once the air temp lowers, you dont need it, as even then, you have switched the air con off anyway.
Call me logical, butwhy keep spending money on addatives when there are oppertunities on the car to gain supplies of anything you need.

bigdavegtt

You are talking about two different systems here, Water injection , i.e water being sprayed into the intake and so lowing charge temp and combating dettenation. And then an IC spray, which is external, again to lower intake temps but does not enter the engine in anyway.

Methanol has been seen to give good results when used with Water injection.

Dave

StanS

iTrader: (3)

Nom - not yet tried beer as antifreeze
Also me and moderation not often compatable - but considering the amount "invested" in engine, followed 10% vol advice this time !!!!
Stan

Leslie

Deep

A good few years ago I built a turbocharged 1300cc BDA engine for my Sports Racer. It was set at 20 psi and was producing 265 BHP at 11500 RPM. It suffered from detonation initially-turbo's were very new in those days, so I set up a water/methanol WI system. This cured the detonation problem but the scrutineers threw it out as being outside the regs. I then used water/methanol sprayed onto the intercooler and the cooling was sufficient to stop the detonation successfully. As you rightly said, the latent heat of evaporation of the methanol is high and helped the cooling in either case.

Hope this helps

Les

Deep Singh

Thanks leslie.What concentration did you use and what do you think about this flame front issue? Many thanks,Deep