964enthus

On paper ,it looks ideal fuel (irrespective of cost )
higher energy and reasonably low temperature .has that been tested in our 964(% mix,hp.temp.wear...)?
""...As an engine fuel
In a minor application, nitromethane is used as a fuel in racing, particularly drag racing, ". The oxygen content of nitromethane enables it to burn with much less atmospheric oxygen in comparison to hydrocarbons such as gasoline:
14.6 kg of air is required to burn one kilogram of gasoline, but only 1.7 kg of air for one kilogram of nitromethane. Since an engine’s cylinder can only contain a limited amount of air on each stroke, 8.7 times more nitromethane than gasoline can be burned in one stroke. Nitromethane, however, has a lower energy density: Gasoline provides about 42–44 MJ/kg whereas nitromethane provides only 11.3 MJ/kg. This analysis indicates that nitromethane generates about 2.3 times the power of gasoline
Nitromethane has a laminar combustion velocity of approx. 0.5 m/s, somewhat higher than gasoline, thus making it suitable for high speed engines. It also has a somewhat higher flame temperature of about 2400 °C. The high heat of vaporisation of 0.56 MJ/kg together with the high fuel flow provides significant cooling of the incoming charge (about twice that of methanol), resulting in reasonably low temperatures...."

Indycam

Do you wish to drag race your 964 ?

964enthus

Purely theoretical!!

Indycam

If we are doing "Purely theoretical!!" ...
Big stuff 3 has a system that can switch between two tanks of fuel as needed .
A low octane for normal and a high octane for when you want to go .
You could maybe set it up to switch from gas / gas to gas / nitro .
It uses two sets of injectors , switches between one set and the other to save from burning the good fuel when its not really needed .
One problem you might have with running the nitro is that it might blow up a normal cylinder . The pressure inside might go right past what porsche thought the cylinder might never see . The engine might be in pieces before you get anywhere .
I once saw a brand new Keith Black v8 for sale on ebay cheap .
If you wanna play with nitro ...
http://www.keithblack.com/

http://www.keithblack.com/movie.html

964enthus

not talking about 90% nitro,of course ,but maybe 5 or 10%,in fact what would increase performance wthout damaging the engine (if such a thing is possible !!)

Indycam

OK , then once again the Big stuff 3 system would be the way I would go .
Do two tanks , one with normal gas and one with 5-10% nitro .
Set it up to switch over to the "nitro" tank at full throttle above 4000 rpms ?
Or buy a turbo car that Porsche has done all the leg work / engineering on already ?
Running nitro on the street is illegal . Its not a DOT aproved motor fuel .
Where are you ?

964enthus

UK
as I said ,it is more a theoretical point of view
When I read all the modifications 964 owners are prepared to go for to increase power ,chips and so on ,i wonder if the addition of X% of nitromethane would not be an easier solution
and certainly it would be a reversible one
as for the legality of this ,i am not sure in the UK ,although the fact that this fuel would not have been taxed probably gives you a hint of the answer !!

Indycam

We are no longer talking "Purely theoretical!!" if we are talking about doing this vs "chips and so on".
Its not going to work in the real world . The cost to get it to work is going to be major . The cost to buy the fuel is going to make a turbo look cheap .
Legality in any place that gives a damn is going to be a problem when your tail pipe spits out poison .

Indycam

GEM Nitromethane, 5 Gallon (OUT OF STOCK) Price: $405.50
http://www.hiperfuels.com/catalog.as...06889&detail=1
http://www.competitionplus.com/index...6534&Itemid=24
http://www.dragracingonline.com/prin...n+whom+you+ask.

964enthus

thanks for the info and links
not cheap,but at 5 to 10 % still reasonable !!

964enthus

usuall;y ,nitromethane is mixed with ethanol
what happpens if mixed with petrol?
Please excuse my ignorance if this is a silly question !!

Indycam

http://en.wikipedia.org/wiki/Nitromethane
"Explosive properties
Nitromethane was not known to be a high explosive until the 1950s when a railroad tanker car loaded with it exploded[citation needed]. After much testing it was realized that nitromethane was a more energetic high explosive than TNT, although TNT has a higher velocity of detonation and brisance. Both of these explosives are oxygen poor and some benefits are gained from mixing with an oxidizer, such as ammonium nitrate. Pure nitromethane is an insensitive explosive with a VoD of approximately 6200 m/s, but even so inhibitors may be used to reduce the hazards. The tank car explosion was speculated to be due to adiabatic compression, a hazard common to all liquid explosives. This is when small entrained air bubbles compress and superheat with rapid rises in pressure. It was thought that an operator rapidly snapped shut a valve creating a 'hammer-lock' pressure surge. Nitromethane can be sensitized by adding a base to raise the pH.

Nitromethane can also be mixed with ammonium nitrate, which is used as an oxidizer, to form an explosive mixture known as ANNM. One graphic example of this was the use of nitromethane and ammonium nitrate on the Alfred P. Murrah Federal Building at Oklahoma City."

I think I would not want to try and mix anything with nitromethane .
I don't like surprises .

964enthus

we have the same source :wikipedia !!
this stuff has beeen used for so many years in model aircrafts
developping incredible hp to cc ratios with no major issue I know about
(btw :all aircooled as well !!)

Bull

Get a Basset Hound, as we have, and you will learn all about nitromethane!

Indycam

In the early days of nitro , the guy who could put the right amount of nito in his tank was the champ in drag racing . If he put to much in the motor would bust , to little and he would not make the fast et .
I will now sit back and watch as you trip the can into your tank . Good luck . Hope you have deep pockets and lots of spare motors .