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Author Topic: Octane boost  (Read 4002 times)
Petes L48
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« Reply #15 on: July 05, 2012, 01:05:10 PM »

Here's the Sunoco site, just enter your zip
http://racegas.com/fuelfinder
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lcmc
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« Reply #16 on: July 05, 2012, 06:39:21 PM »

If you have a local airport nearby just go buy some aviation fuel. Our local airport has a pump open 24-7.
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Danny
1969 Z/28 X77
1970 Nova L78 9300 original miles
paceme
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« Reply #17 on: July 07, 2012, 08:58:08 AM »

My understanding is that aviation fuel will stop detonation because of its octane level, but doesn't have the same quick burn characteristics as race fuel. Aircraft engines run at a relatively constant speed at lower rpm, unlike race engines that run in a wide dynamic range.  The bottom line is I don't believe you will get the same performance out of AV fuel versus race fuels.
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Steve Shauger
Vintage Certification™ Program, Providing Recognition And Status To Unrestored Vehicles. Website www.vintagecertification.com
lcmc
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« Reply #18 on: July 08, 2012, 10:27:53 AM »

My understanding is that aviation fuel will stop detonation because of its octane level, but doesn't have the same quick burn characteristics as race fuel. Aircraft engines run at a relatively constant speed at lower rpm, unlike race engines that run in a wide dynamic range.  The bottom line is I don't believe you will get the same performance out of AV fuel versus race fuels.

All I know is that my engine builder uses it to dyno all high compression engines he builds including mine. He got 447HP out of my stock 70 L78.
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Danny
1969 Z/28 X77
1970 Nova L78 9300 original miles
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« Reply #19 on: July 08, 2012, 10:01:27 PM »

You have to be very careful with Av-Gas. There are properties that motor vehicles need that are not in that fuel. It is not recommended for regular use.
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lcmc
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« Reply #20 on: July 09, 2012, 01:16:29 PM »

You have to be very careful with Av-Gas. There are properties that motor vehicles need that are not in that fuel. It is not recommended for regular use.

Such as?
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Danny
1969 Z/28 X77
1970 Nova L78 9300 original miles
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« Reply #21 on: July 09, 2012, 11:58:47 PM »

Detergents, lower burn rate, lower lead level.
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BlackoutSteve
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« Reply #22 on: July 10, 2012, 01:03:01 AM »

AvGas is pretty much the same complex blend of hydrocarbons as race fuel but has it's octane calculated differently.
100/130 for example is a take-off and cruise octane number which doesn't compare side by side to Motor or Research octane numbers, but the lower is closer.
The Reid Vapor Pressures are different also because of the altitude (atmospheric pressure) that it needs to vaporize at. So, don't buy Avgas in winter for use in summer and vice-versa.

In most cases, you won't need to use AvGas or Race fuel at 100% anyway..
For years I easily got away with a mix of 66% 92(R+M)/2 with 33% 100/130 AvGas in my 12:1 BBC with no adverse effects what so ever and with ~40° total.. My engine cranks 225psi during compression tests and also has a knock sensor.
When it was dynoed (engine dyno) it made just slightly more power on the AvGas that I supplied as opposed to the VP fuel the dyno operator supplied. We made a few jet changes as well and the AVGas results were better. OK, splitting hairs, but still better. That has nothing to do with octane though or which fuel is "better". That's probably just a case of the particular blend of AvGas I supplied had a higher specific energy in a given volume compared to the VP and showed that the AvGas was still quite capable of producing power in a large bore automotive V8 engine, like the VP.

Basically, what I am saying is AvGas is fine, but don't go by it's octane numbers and use it in the same months that you buy it..

Anyway, a better option is water injection. I have a Snow N/A kit and with 92 octane I am still get detonation free with 38° total advance with 12:1 and the same ~260° solid roller. You can add 50% methanol to the water if you want for even more resistance and a couple of ponies.. I am yet to try it. Water is cheap and easy. Wink
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Restoring my RHD 69 Jane in Melbourne, Australia.
http://www.usmuscle.com.au/Forum/showthread.php?t=2840
Stingr69
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« Reply #23 on: July 16, 2012, 09:19:46 PM »

I have used Torco in my supercharged 2010 SS and it does the trick. There are times when I can not find 93 Octane gas and I MUST run additive or risk engine damage. No downside that I can tell. I keep a can in the trunk for road trips. You can buy it direct or from Amazon. I think buying direct is cheaper on the freight.

-Mark.
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mickeystoys69RSSS
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« Reply #24 on: July 17, 2012, 12:05:00 PM »

Thank you all for the replies. Lots of good ideas that I never would have thought of. I added a can of Lucas brand octante boost and filled the remainder of the tank with about 8 gal of 92 premium octane. That mix appears to solved the problem.  I drove the car to a local cruise in and had no problem with auto det. after turning off the ignition.
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