gasoline

I have the opportunity to purchase aircrafts gasoline. I was told they are 100 octaine and very pure. Its blueish colour.
Is this a good Idea, or will it cause damage for my motor ( 2.7l cis)?

Mercelo, we can't go on meeting like this. Our better halves might get suspicious!!

But, higher octane is necessary for a gasoline engine only when you are experiencing "pinging" or stumbling, and other diveability problems. Higher octane just avoids pre-detonation, and does not, in itself, create more power. However, that said, be aware that you can increase compression, increase timing, etc. and other things to increase power, and then you might need high octane fuel.

But high octane does not have more "energy" in the fuel, and therefore you will not go faster. Your car might like it better when you go up hills, pull a heavy load (in a Porsche? I doubt you would want to pull heavy loads), and while at full throttle, but for normal driving, higher octane than is required by your engine is both unnecessary and just spends your money quicker.

Use the octane recommended by Porshce, and save your money for other fun things.....Andras

Mercelo, we can't go on meeting like this. Our better halves might get suspicious!!

But, higher octane is necessary for a gasoline engine only when you are experiencing "pinging" or stumbling, and other diveability problems. Higher octane just avoids pre-detonation, and does not, in itself, create more power. However, that said, be aware that you can increase compression, increase timing, etc. and other things to increase power, and then you might need high octane fuel.

But high octane does not have more "energy" in the fuel, and therefore you will not go faster. Your car might like it better when you go up hills, pull a heavy load (in a Porsche? I doubt you would want to pull heavy loads), and while at full throttle, but for normal driving, higher octane than is required by your engine is both unnecessary and just spends your money quicker.

Use the octane recommended by Porshce, and save your money for other fun things.....Andras

Mercelo, we can't go on meeting like this. Our better halves might get suspicious!!

But, higher octane is necessary for a gasoline engine only when you are experiencing "pinging" or stumbling, and other diveability problems. Higher octane just avoids pre-detonation, and does not, in itself, create more power. However, that said, be aware that you can increase compression, increase timing, etc. and other things to increase power, and then you might need high octane fuel.

But high octane does not have more "energy" in the fuel, and therefore you will not go faster. Your car might like it better when you go up hills, pull a heavy load (in a Porsche? I doubt you would want to pull heavy loads), and while at full throttle, but for normal driving, higher octane than is required by your engine is both unnecessary and just spends your money quicker.

Use the octane recommended by Porshce, and save your money for other fun things.....Andras

Mercelo, we can't go on meeting like this. Our better halves might get suspicious!!

But, higher octane is necessary for a gasoline engine only when you are experiencing "pinging" or stumbling, and other diveability problems. Higher octane just avoids pre-detonation, and does not, in itself, create more power. However, that said, be aware that you can increase compression, increase timing, etc. and other things to increase power, and then you might need high octane fuel.

But high octane does not have more "energy" in the fuel, and therefore you will not go faster. Your car might like it better when you go up hills, pull a heavy load (in a Porsche? I doubt you would want to pull heavy loads), and while at full throttle, but for normal driving, higher octane than is required by your engine is both unnecessary and just spends your money quicker.

Use the octane recommended by Porshce, and save your money for other fun things.....Andras

Since your engine has no particular need for high octane, there is no real danger, but I think I would try it in another vehicle FIRST, just to be sure it really is gasoline, and that it isn't some odd mixture. The 100 octane aviation gas here was green back in the '70s as our super premium leaded gas was being phased out. The AvGas was good for 10.5:1 high performance engines back then, but the price got out of hand in the '80s, and it was not practical for everyday use.

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Warren Hall
1973 911S Targa

hey andras,
what is the ideal octane recommended for the 2.7l?
Are u in hungary?

Marcelo:

Sorry, I don't have my 1974 911 2.7l any more, though I could research that for you and get back to you. Do you have your Owner's Manual? It should say. Also, look on the inside of your gas filler flap - usually Porsche puts that information on a decal.

No, I live in Columbus Ohio, though I was born in Szombathley, Hungary. I've also lived in Boston, Washington, Zurich, Paris, California, and now circumstances find me in Columbus - not a bad litttle town, but not the same as Paris or Zurich ....Andras

IŽll check in my manuals.....tks.
I had a friend here in Brazil called Andras, hungarian, very nice guy.

Macelo:

There are so few Hungarians in the world, that we all have to be nice guys......Andras

As far as the recommended octane, not exactly sure, but 92 is definitely enough. I had an engine rebuilt with compression pistons and a different cam running triple barrel Webers on it and it is very happy with premium.

I would say that the recommended would be around 90, but not sure.

Hope this helps you out,
Paul

And as far as the AvGas is concerned, the color is a very light blue now. Race gas, which is about 103 octane...at least the kind that my friend buys is also blue, but a little darker.

Paul

Tks, andras and paul.
I think I'll stick to the Premium.

Marcelo:

Hello again!

You can't go wrong with 90 or 92 Octane, but do you really need it? I use 87-88 RON Octane for most of my driving, and switch to 92 for track events, when I do get pinging at full throttle.

Once again, the higher octanes are not for more power (there is only so much energy in gasoline, and a higher octane does not "extract" more energy), but rather for avoiding the effects of pre-detonation. I have never had any pinging using 88 RON, though I do perhaps when going up hills and an added load is put on the engine. But then just slowing down or shifting down a gear will decrease the load, and the pinging goes away.

Some say this slight inconvenience is not worth the trouble; I say the additional "trouble" is what makes our cars extensions of ourselves, and not just appliances. Each to his own, I suppose.

But all kidding aside, have you experienced any trouble using 88 or 90 RON gasoline? Why fix something that isn't broken?.....Andras

unfortunately here in Brazil our gasoline is not that good and pure. For anti polution purpose, our gasoline have 22% of alcohol fuel in it. So I quess that 50% misture of the avgas would neutralize some of this alcohol fuel.
what do u think?

Hello fellow Hungarians.

I'm a private pilot so I had to learn all about avgas in my training. It's also referred to as "110LL" - 110 octane, low lead.

So, avgas (the bluish colored stuff) is actually 110 octane, and contains lead. I pretty unilaterally recommend against putting it in your car unless you've removed the catalytic converter, which will eventually go south using leaded gasoline.

That stuff sure makes airplanes happy, though!

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Mark Szabo
1986 911 Targa 3.2

Mark:

Nice to see you back on the Board.

Szervusz, to you too, and you really ought to learn a few more phrases. Any Hungarian you meet will be dazzled by your erudition - as will any person to whom you speak in their language.

I guess we all like to be loved.....Andras

Marcelo:

Have you noticed that there is a Marco on a number of other posts?

Talk about a small world!!!.....Andras

no, I havenŽt seen it. but what is he, brazilian?

Hmm,

that is kind of funny, in TN the gas is 100LL, and then there is jet fuel...which is completely different. at least i am almost positive that it is 100LL...i haven't been flying in a couple months, so am not totally positive.

anyways,

Paul

Marcelo:

I did a search using the search feature, and found out that marco lives in Alabama, USA. Sorry, he's apparently not a Brazilian, though he couold be, living in AL....Andras