Somewhere around 100%

We had a bulk underground thinners tank at Rheem, it was 100% toluene...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Adding toluene to petrol that already is maxed out with toluene is going to get you no advantage.
See that chart that I posted previously? Notice it only goes up to 40%? Any more and you get less gain. If the petrol in your tank already contains 40% (which I think it could) you are just wasting toluene.

The trick is to buy a share in a Cessna.

yeah I hear you Morris,, I can get 113 octane fuel fom Rocket Idustries (fast parts shop) in 44 gal drums.... I haven't personally asked for a quote, but a guy I know who was running it in a race boat says that he was paying around $1400 a drum,, thats around $6 a litre... and (i might be wrong, because I got this off the web) but apparently AVGAS is about $10 a litre (QLD price for nov 09)....

So I'm just dreaming and scheming... where there's a will, there's a dead person...

I have seen first hand how incredible volotile thinners is,, so I'm willing to give it a go in a test engine,, but I'm thinking about throwing in a pinch of 2 stroke oil or something so that it doesn't end up to dry..

I'd like to try that and Acetone too (before giving meth a go.. start with the cheap easy to get stuff)...

What are you trying to achieve?
What is your current compression ratio?
Is it pinging?
Are you retarding the ignition to reduce pinging?
What altitude do you drive at mostly? (sea level or in mountains?)

There is a million ways to make a car go better. Raising the octane level will do nothing unless the engine actually needs it.

My Holden was running 15 to 1 on Avgas. Do you think you need more octane than that?

Ok, its for a rally engine, I am aiming for 13:1. Thing is, I have never built anything with that kind of CR before, so I don't really know what to expect or how it will go on pump fuel (especially given all the inconsistancies I hear about and the way that Premium tends to drop in value pretty quickly)... As far as altitudes go a varied mix, from sea level to about 1300 meters above.

I already have one engine which came in a 11.4:1 and it I have already noticed how fussy it is on timing... if the fuel in it is a couple of weeks old I need to wind it back, so I'm already aware of that option.

You mentioned earlier that AVGAS is 100 octane fuel,,, so if you can safely and reliably run a car at 15:1 on 100 octane fuel then I guess that answers the other question I had on my mind.

I'm just trying to find out what works and what doesn't. Not so that I could home brew 130 octane fuel, I don't need anything that high and I know that. I just don't want to get caught out by crap quality fuel. I figure that even if it is a little higher than I need, it wont do any harm, but it just means that i can get better results with my timing,,, even if with the CR of the engine I could never fully make use of the higher rated fuel.. Know what I mean?

I could run my Holden on Avgas with 15:1 but that does not mean that your Mini like like it. The Holden was running a single stock Stromberg carby. It would be like running a Mini on a Victa carby. You needed to bump the compression up because it could not fill the cylinder properly with the restricted carby.

The best thing to do is build your motor to match the available fuel.
Don't try to do it the other way around.

The thing is, I know your right.. and what you are saying is both sensible and logical, and certainly the way I normally like to approach things.... ((but I just don't want to admit it))..

just run it on nitro-methane or get on the net and find out how to make your own nitro at home. Terroist websites are of some benifit

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Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

This works!
http://www.hi-flow.com/HPOP4.HTM

1) God does not even know that.

2) Yes, he is clearly retarded.

3) I'd say bad.

God doesn't know what I'm doing,.,,.,., its a secret

PK stop being a mad scientist and just use Elf BFK-07

" It contains No Benzene, No Lead, No Sulphur, and emits less than half the carbon monoxide of a standard pump fuel . Benzene is a natural enemy of rubber so using a fuel with no Benzene will mean that rubber components like carburetor diaphragms, fuel lines etc will last much longer . The other known fact is that Benzene is a cleaning agent so whilst you are in the case of a two stroke adding oil to your fuel for lubrication, the Benzene is trying to clean the lubricating oil off the moving parts. (i.e. big end, main bearings, piston etc.) "

Race Fuels Pty Ltd



If your Mini is properly built / tuned / prepared and has had $$$$$$ spent on it you would not use any other fuel !!!!!






.

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Thanks 74snail,

You always produce the goods.

I just looked up the web site,,,, very impressed from what I can gather,, still reading though... I'm gana try and track down some other opinions on it and other peoples experiences... but it looks like a winner

Cheers

Toluene is an excellent octane booster - but like most things moderation is best (unless you run a modern GP car).

Aus fuel is pretty much about half toluene. Among its other properties, Toluene softens rubber. So not enough and your rubber fuel hoses, diaphragms etc harden and fall off, too much and they soften and fall off. Goldilocks anyone?? The Government stipulates how much you get at the pump.

Octane is pretty much additive in mixtures... add 1 litre of fuel with an octane rating of 100 to 1 litre of toluene (which has an octane rating of 121) will produce 2 litres of fuel with an octane rating of 110 (ish).

Benzene (note toluene = methyl benzene) is a much better octane booster but is highly carcinogenic. Toluene is much more benign; misuse (the mind boggles) of toluene is alleged to cause "atrophied testicles" (see the Canadian Government chemical data sheets..

Octane rating is a measure of a fuels resistance to detonation. It is critical depending on the dynamic compression of your engine.... However, there are many other properties of a fuel to govern its suitability for your engine. Alcohol has a much higher octane rating - which is one reason they use it in turbocharged Indy Cars - but its a much less dense (energy wise) fuel so you need a LOT more of it. .. and it eats rubber...

So what was the question?

Cheers, Ian