field ·
Im able to get hold of a bit of av gas once a month and was wondering if it would be all right to run in a 2l kombi....I'm worried it may make the engine run a bit hotter, or could i ron 50/50 with pulp?
Aussieveedubbers · Tech Talk
AV Gas
https://forums.aussieveedubbers.com/threads/42627/av-gas
barls ·
ive seen pistons melted by this stuff. if it was my car i wouldnt even try it not worth the risks
Alex Holzl ·
we used to run it in our 5hp brigs and stration powered go kart when we were 6 and 7 years old... 😀😀😀
Alex
Alex
tassupervee ·
Avgas is just that, Aviation gasoline. Its not suitable for road cars.
Its heavily leaded and designed for large displacement, low revving, low specific output engines run in a high alttitude. The fuel burns with a very even and slow flame front which makes controlling combustion in a very large displacement/low RPM engine a whole lot easier.
Its been used for years as a race fuel due to it past ready availability and the fact that the fuel will tolerate some fairly wild tuning stuffups and the engines manage to live. Great stuff for racers that dont know how to tune real well.
However, it is worth no power to you and will only offer a strong and distinctive smell. Ive heard plenty of stories about guys lunching engines but in a road car, Id be pretty dubious of this but usually, the fuel requires a slight re-jet (about5%) richer to keep EGT and EGO's in check
You also must consider the consequences of getting caught using it in a street car and the fines start at some horrendous sky high figure, not to mention the even greater fines for the supplier of the stuff. The EPA has NO sense of humour on running leaded fuels in street cars nowadays.
Due to its characteristic smell, its very obvious when running it and pretty difficult to disguise.
Apart from that, cutting it in with your usual fuel will have no effects. Just dont get caught M8!
L8tr
E
Its heavily leaded and designed for large displacement, low revving, low specific output engines run in a high alttitude. The fuel burns with a very even and slow flame front which makes controlling combustion in a very large displacement/low RPM engine a whole lot easier.
Its been used for years as a race fuel due to it past ready availability and the fact that the fuel will tolerate some fairly wild tuning stuffups and the engines manage to live. Great stuff for racers that dont know how to tune real well.
However, it is worth no power to you and will only offer a strong and distinctive smell. Ive heard plenty of stories about guys lunching engines but in a road car, Id be pretty dubious of this but usually, the fuel requires a slight re-jet (about5%) richer to keep EGT and EGO's in check
You also must consider the consequences of getting caught using it in a street car and the fines start at some horrendous sky high figure, not to mention the even greater fines for the supplier of the stuff. The EPA has NO sense of humour on running leaded fuels in street cars nowadays.
Due to its characteristic smell, its very obvious when running it and pretty difficult to disguise.
Apart from that, cutting it in with your usual fuel will have no effects. Just dont get caught M8!
L8tr
E
Wag67 ·
i used to run avgas in my class 6 offroader . It had a fairly basic 1600 bettle motor with compression around 10 to 1 and it ran fine and heaps of grunt. didn't seem to do much damage and the motor last all year before i rebuilt it.
Stanley ·
a mate used to run it in his boss mustang...is a fairly high octane
field ·
Thanks ,i think i might give it a miss and just use pulp
helbus ·
I don't think it is the fuel it'self that will melt the pistons. I know a guy who has an old Alfa in the country near an airstrip and one of his mates gets him avgas so he can run it with its 10.5:1 compression.
Tune for 98 octane and you will be right.
Tune for 98 octane and you will be right.
General_Failure ·
I may be a bit off, but isn't avgas about 150 octane?
1303Steve ·
Hi
People in the classic car movement were offered special log books to allow them to buy and use avgas in classic street cars in NSW. Better off with PULP.
Steve
People in the classic car movement were offered special log books to allow them to buy and use avgas in classic street cars in NSW. Better off with PULP.
Steve
amazer ·
Not sure what the exact octane is, but its something more like 110.
It wont give you any more power in the same engine, in fact more likely to give less power. To give you the most power you should un the lowest octane rating your engine can handle without pinging.
You can also get a CAMS logbook which allows you to buy the stuff, but you still cant use it on the road. Why would you want to? Must be damned expensive these days.
A better option is to use a pulp/toluene mix. I used 30% toloune from memory and ran 25psi boost in my kombi. You have to tune it pretty rich though because of the higher oxygen content and when you switch back to normal fuel for regualr petrol driving you will be blowing black rain clouds. It still works out expensive, but at least you dont need a permit to buy it and you wont get sent to hell by the EPA.
It wont give you any more power in the same engine, in fact more likely to give less power. To give you the most power you should un the lowest octane rating your engine can handle without pinging.
You can also get a CAMS logbook which allows you to buy the stuff, but you still cant use it on the road. Why would you want to? Must be damned expensive these days.
A better option is to use a pulp/toluene mix. I used 30% toloune from memory and ran 25psi boost in my kombi. You have to tune it pretty rich though because of the higher oxygen content and when you switch back to normal fuel for regualr petrol driving you will be blowing black rain clouds. It still works out expensive, but at least you dont need a permit to buy it and you wont get sent to hell by the EPA.
tassupervee ·
Hehehehehehehe Toluene eh?
Old drag racers trick!
You could always tell the boys running paint thinners in their old Toranas and Fords!
Smells like a bloody spray painters!
Avgas is rated at 100/130.
100 being the octane number and 130 being the performance number.
However, during my superkarting days, after subjective testing of various samples of avgas from various suppliers some years ago, both from the pump and from freshly opened tins, we got back octane figures ranging from 96 as the average minimum and 108 (somewhere around there) as the average maximum.
From memory the mean figure was around 98 or so.
Hellbus is quite correct as far as running it is concerned.
I use avgas, pulp or a mixture of the two in my F-Vee and it makes no appreciable difference to EGO readings. (Altho the EGO sensor get pretty sluggish after being "poisoned" with lead).
Again, bear in mind, Avgas is not rocket fuel. It is designed to control combustion in aircraft piston engines at high altitude and lean mixture settings.
It is NOT a good performance fuel. It WILL allow you to run ridiculous compression ratios and wildly advanced ignition with minimal detonation but it is no magical jungle juice.
You want horsepower in a can? Well try some other stuff like VP, Sunoco, Elf among others.
Expect to pay around 7 to 8 dollars per litre.
Jet her up nice and fat to take advantage of the increased oxygen available and make a few extra HP!
Wahooo!
Plain old low octane ULP is just fine for my 1200cc race engines.
L8tr
E
Old drag racers trick!
You could always tell the boys running paint thinners in their old Toranas and Fords!
Smells like a bloody spray painters!
Avgas is rated at 100/130.
100 being the octane number and 130 being the performance number.
However, during my superkarting days, after subjective testing of various samples of avgas from various suppliers some years ago, both from the pump and from freshly opened tins, we got back octane figures ranging from 96 as the average minimum and 108 (somewhere around there) as the average maximum.
From memory the mean figure was around 98 or so.
Hellbus is quite correct as far as running it is concerned.
I use avgas, pulp or a mixture of the two in my F-Vee and it makes no appreciable difference to EGO readings. (Altho the EGO sensor get pretty sluggish after being "poisoned" with lead).
Again, bear in mind, Avgas is not rocket fuel. It is designed to control combustion in aircraft piston engines at high altitude and lean mixture settings.
It is NOT a good performance fuel. It WILL allow you to run ridiculous compression ratios and wildly advanced ignition with minimal detonation but it is no magical jungle juice.
You want horsepower in a can? Well try some other stuff like VP, Sunoco, Elf among others.
Expect to pay around 7 to 8 dollars per litre.
Jet her up nice and fat to take advantage of the increased oxygen available and make a few extra HP!
Wahooo!
Plain old low octane ULP is just fine for my 1200cc race engines.
L8tr
E
56astro ·
Just use JET-A1 and be done with it
🙅
🙅
bugboymatt ·
good in diesel engines with a bit of extra additive !!!56astro wrote:Just use JET-A1 and be done with it
🙅
tassupervee ·
Bah!56astro wrote:Just use JET-A1 and be done with it
🙅
Just a slightly narrower "cut" (distillation process" kerosine with no blue dye added!
Pffft, No value in that unless you want good degreaser!!! Its about All its worth!!
Yer adding kero into diesel was another old timers trick.
Helps the old lower compression diseasels to run up in the real cold.
They used to add a percentage of petrol as well for some extra bang!
And that was often the result!!!!!
LMAO
L8tr
E
2443TT ·
A mate ran an avgas and di-methal-benzene (tolurine I think) blend in his 12:1 holden v8 that was running 12.5:1 cr. It went very well for a while, at least till he cooked the engine doing 3rd gear burnouts with 4 guys in the car...