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#1 (permalink) Old 04-30-2009, 08:19 PM
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Jet fuel

Hey guys, last week I added a gallon of jet fuel mixed with 8 gallons of gas in my car and I can tell you, it makes a big difference. the thing is that I want to know if any of you have ever done that and if yes, will it affect my engine ?
Other thing, can I add a turbo without touching the engine, I was reading the other day that I can boost 7 to 8 pounds on my stock engine and still run safe. if yes, I'm interested in buying one.
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#2 (permalink) Old 04-30-2009, 08:36 PM
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You should be able to turbo with 6 - 8 psi on stock internals. Another option is to supercharge instead.

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#3 (permalink) Old 04-30-2009, 08:45 PM
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I'm not sure jet fuel is a good idea, since it's essentially kerosene. Did you mean aviation grade gas, as for piston engined aircraft? That would just be an octane boost.

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#4 (permalink) Old 04-30-2009, 09:10 PM
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yes, it's a friend who has a plane that gave me 10 gallons of fuel.
drz, you think it would be better if I superchage it
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#5 (permalink) Old 05-01-2009, 12:35 AM
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Most definately!
Putting airplane fuel into your car will cause you some damage. Cars aren't made to handle that sort of fuel. You're bound to blow some rings or something. Mixing fuel is also a definate no no.
Bimmers do love a higher octane but that's just going too far.
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#6 (permalink) Old 05-01-2009, 01:47 AM
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Quote:
Originally Posted by Shadetree View Post
Most definately!
Putting airplane fuel into your car will cause you some damage. Cars aren't made to handle that sort of fuel. You're bound to blow some rings or something. Mixing fuel is also a definate no no.
Bimmers do love a higher octane but that's just going too far.

Do not state things as fact when they are not. The worse case scenario from running excessively high octane is excessive carbon buildup because the flame front is too slow and leaves behind junk.

JP is kerosene and is the opposite of what you want (its rated in heptane and that is the ability of a fuel to detonate). AVG is good, and what you do want (rated in octane from 100-145).

But mostly its wasteful and will foul shit up unless you're running 13:1 C/R or F/I.

What color is the fuel?

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#7 (permalink) Old 05-01-2009, 07:58 AM
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if the fuel you have is a light bluish color, you are good, that is aviation fuel. and like nukeduster said, it won't harm your engine too much other than carbon deposits.

seriously people...i have run a full tank of pure 110 0ctane AVG through my e30 without a problem.

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#8 (permalink) Old 05-01-2009, 08:54 PM
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Quote:
Originally Posted by nukeduster View Post
Do not state things as fact when they are not. The worse case scenario from running excessively high octane is excessive carbon buildup because the flame front is too slow and leaves behind junk.
Ok, I may not be an authority on the subject but "worst case scenario...carbon buildup"? C'mon...do you really believe that?
I know that AVgas can be used in automobiles but only for short periods and sparingly. Like I said...cars aren't equiped to handle the stuff. The pre-ignition will kill your CAT and O2 sensors. Airplanes do not have cats! Your valves will burn and your rings won't appreciate it either.There are a number of components in the design of automobiles that using anything other than unleaded gasoline with will cause serious damage if not used sparingly.
Here's a little educating material that should help...

Aviation gasolines were all highly leaded and graded using two
numbers, with common grades being 80/87, 100/130, and 115/145
[109,110]. The first number is the Aviation rating ( aka Lean Mixture
rating ), and the second number is the Supercharge rating ( aka Rich
Mixture rating ). In the 1970s a new grade, 100LL ( low lead =
0.53mlTEL/L instead of 1.06mlTEL/L) was introduced to replace the
80/87 and 100/130. Soon after the introduction, there was a spate of
plug fouling, and high cylinder head temperatures resulting in cracked
cylinder heads [110]. The old 80/87 grade was reintroduced on a
limited scale. The Aviation Rating is determined using the automotive
Motor Octane test procedure, and then converted to an Aviation Number
using a table in the method. Aviation Numbers below 100 are Octane
numbers, while numbers above 100 are Performance numbers. There is
usually only 1 - 2 Octane units different to the Motor value up to
100, but Performance numbers varies significantly above that eg 110
MON = 128 Performance number.

The second Avgas number is the Rich Mixture method Performance Number
( PN - they are not commonly called octane numbers when they are above
100 ), and is determined on a supercharged version of the CFR engine
which has a fixed compression ratio. The method determines the
dependence of the highest permissible power ( in terms of indicated
mean effective pressure ) on mixture strength and boost for a specific
light knocking setting. The Performance Number indicates the maximum
knock-free power obtainable from a fuel compared to iso-octane =
100. Thus, a PN = 150 indicates that an engine designed to utilise the
fuel can obtain 150% of the knock-limited power of iso-octane at the
same mixture ratio. This is an arbitrary scale based on iso-octane +
varying amounts of TEL, derived from a survey of engines performed
decades ago. Aviation gasoline PNs are rated using variations of
mixture strength to obtain the maximum knock-limited power in a
supercharged engine. This can be extended to provide mixture response
curves which define the maximum boost ( rich - about 11:1
stoichiometry ) and minimum boost ( weak about 16:1 stoichiometry )
before knock [110].

The 115/145 grade is being phased out, but even the 100LL has more octane than any automotive gasoline.

It may be of interest for you to know to that it is illegal to run AVgas in your car...that's just a tax thing, though...AVG is not tax rated for road use. I don't know about the States but it is also illegal in Canada to run leaded fuel in your vehicle.

You're better off with turbo or air induction boosting.
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#9 (permalink) Old 05-03-2009, 01:54 PM
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Light bluish color, that's the exact color of the fuel. Anyways I'm going to listen to you advice shadetree, thanks a lot. It's the first time I put it in the car and I hope it won't have time to affect my engine.
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