Normac

Can I use this fuel ??
Does anyone know the make up, octane rating ect?

richrussell

LL avgas (what Cessnas use) is leaded, so will kill your lambda sensor and cat. It is however 112RON or so

Good stuff for older carb'd turbo cars though!

Rich

Normac

That was Quick....

Thanks for the rep Rich I thought it may have been unleaded should have given it a bit of power hey....
Never mind the pistons

dela

where can you get AVGAS from in the UK - I fancy trying some in my little racecar.....

richrussell

erm, Airports?

Rich.

dela

Fair Point Rich.....

Heathrow is good and local to me

Gary C

I seem to remember reading a book on tuning that did not recommend using AVGAS. Not totally sure of the details, but I think the octane may be higher so you can run more boost/compression without pre-ignition, but the flame propagation rate was much slower ? even to not getting full combustion at high revs ?
so you did not get the gains you might expect.

Can't remember the full details, anyone ?

Scooby mart

i was at a nissan pulsar gtir rolling road day and a guy had just run in his 400bhp gtir and was supposed to be proving it on these rollers.

basically he filled up with aviation fuel and put it on the rollers. IT didnt run very well(as in it didnt make 400bhp) and the tuning company said this is not the fuel that the car was set up on. He ran it out of the system and put his normal pump fuel in and it ran a higher power figure (just off 400bhp after a few runs)

I guess it will be differant for a scooby and it will depend on how the car is set up - But I got the impression from seeing this cars run a lower figure than it did on normal petrol, that higher octane does not neccesarily mean more power. I think on av gas he ran less than 300bhp.

Spoon

Toluene(Methylbenzene)will sort you out.


Interesting read

[Edited by Spoon - 8/20/2003 8:29:11 PM]

Leslie

Avgas gets its high octane rating with a high level of leaded additives. It tends to leave heavy deposits in the combustion chambers, on the valves and on the plug electrodes. The RAF decided to use it for convenience in the Gipsy Major engines in the Chipmunks instead of the low octane fuel they were designed to use. We were continuously having problems with rough running engines in flight and mag drops in pre flight checks because of the deposits on the plugs. Hope this helps your decision.

Les

harvey

iTrader: (48)

Avgas is 100 octane "low lead" This is low lead in aviation terms and has no bearing to what we associate as low lead motor fuel.
Using avgas in a Scoob would be a bad thing.
Typically it is used in flat four, five litre engines with low compression that produce 180bhp at 90% power at 2,700 rpm. It also has additives to prevent carb icing etc and is not what a Subaru engine needs to perform even half decently.

Normac

Thanks for the interesting replys boys looks like it is not a good idea.
The problem we have here is we can only run 94 to 95 octane as that is all that is available, what problems could i face while running about 1,1 bar turbo boost with this fuel

dela

Spoon, a very interesting read about toluene.

Any clues where you can get hold of that?

Edit - read around the site a little more, it sounds like paint shops would stock it. I'll ring my local one and see...

[Edited by dela - 8/21/2003 10:13:19 AM]

harvey

iTrader: (48)

It all depends on what car and model you have and the ECU.
A UK or European Impreza turbo will run quite happily on 95 Ron. A Jap Import requires higher octane fuel. I ran a WRX Import on SUL (97) or Optimax(98.3) for a while but from time to time noticed pinking so now I run on Optimax plus 1ml/litre N.F. in it all the time for safety and it has run at 18psi max (1.25 bar)for 25kmls with no problems.
Providing your ECU is UK/European spec then no problem, I would think and for peace of mind you could run NF octane booster. If not available locally a case could be shipped to you.
For belt and braces consider fitting a Knock Link which is easy to fit and will detect any detonation.
Look on the BR Developments web site or fax Branco for Knock Link info and price delivered. +44 20 8948 4250. If you need NF e-mail me per profile.

Spoon

Dela- We used to buy it from a plc called Ellis and Everard, they were local to us.

We bought it in 25 litre drums so can't say whether or not you can buy it in 1 litre tins.

Normac

Thanks for the info Harvey

The car is a Jap import and not even running a standard CPU it has a Japenese unit caled a Mine's with a very nice gold plaque on it stating waranty and serial no.
From reading the replys I think it would make sense to get some sort of oct boost for this car although the car seems to run very well and there would seem to be no det problem pinking ect..

What do u think of that read on toluene and how safe??
Byron