Author Topic: Octane boost  (Read 23682 times)

Petes L48

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Re: Octane boost
« Reply #15 on: July 05, 2012, 06:05:10 PM »
Here's the Sunoco site, just enter your zip
http://racegas.com/fuelfinder

lcmc

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Re: Octane boost
« Reply #16 on: July 05, 2012, 11:39:21 PM »
If you have a local airport nearby just go buy some aviation fuel. Our local airport has a pump open 24-7.
Danny
1969 Z/28 X77
1970 Nova L78 9300 original miles

Steve Shauger

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Re: Octane boost
« Reply #17 on: July 07, 2012, 01:58:08 PM »
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.
Steve Shauger
Vintage Certification™ Program, Providing Recognition And Status To Unrestored Vehicles.  The Supercar Registry-www.yenko.net-

lcmc

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Re: Octane boost
« Reply #18 on: July 08, 2012, 03:27:53 PM »
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.
Danny
1969 Z/28 X77
1970 Nova L78 9300 original miles

MO

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Re: Octane boost
« Reply #19 on: July 09, 2012, 03:01:27 AM »
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.

lcmc

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Re: Octane boost
« Reply #20 on: July 09, 2012, 06:16:29 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?
Danny
1969 Z/28 X77
1970 Nova L78 9300 original miles

MO

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Re: Octane boost
« Reply #21 on: July 10, 2012, 04:58:47 AM »
Detergents, lower burn rate, lower lead level.

BlackoutSteve

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Re: Octane boost
« Reply #22 on: July 10, 2012, 06:03:01 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. ;)
Restoring my RHD 69 Jane in Melbourne, Australia.
http://www.usmuscle.com.au/Forum/showthread.php?t=2840

Stingr69

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Re: Octane boost
« Reply #23 on: July 17, 2012, 02:19:46 AM »
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.

mickeystoys69RSSS

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Re: Octane boost
« Reply #24 on: July 17, 2012, 05:05:00 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.

COPOZ/28

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Re: Octane boost
« Reply #25 on: February 18, 2020, 09:06:20 PM »
I realize I'm adding a remark to a very old posting topic but, for continuity's sake, I'll go ahead with it.

I've had very good luck with a product called ACES IV from BND Automotive.  They've been in business now (as of 2020) for about 20 years.  Brian Schubert, the "B" in "BND" can be contacted on ph.: 440-821-9040.  Their ACES IV product has been thoroughly dyno tested and vetted by none other than David Vizard.  Fuel treatment is 1 oz. per 6 gallons.  A quart/liter jug treats ~200 gallons and is currently $90 +shipping from Ohio.  Comes in gallon and larger sizes as well.
Chuck B.
Ice cream run in our '69 Z/28 on Woodward Ave. in Royal Oak.
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firstgenaddict

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Re: Octane boost
« Reply #26 on: February 19, 2020, 02:19:00 PM »
I have been running Sunoco 110 @ $9.89 a gallon but switched to 100LL aviation  - which is $4.59 a gal. I have found 55 gal drums for as low as $175 which is just over $3.00 per gal.
The reid VP of sunoco 110 is LOW around 5. most other race fuels are around 7 and street fuels around 8-10 from what I have read.
James
Collectin' Camaro's since "Only Rednecks drove them"
Current caretaker of 1971 LT1's - 11130 and 21783 Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
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firstgenaddict

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Re: Octane boost
« Reply #27 on: March 13, 2020, 04:30:53 AM »
As a follow up I was looking for the Reid vapor Pressure of 100LL (5.5 up to 7) same range as any 110 and ran across a 1986 EPA paper on autogas and avgas along with a table of avgas auto gas mixtures and the corresponding reid vapor pressure numbers - along with octane numbers etc.

PAGE 28 SPECIFICALLY has the table with the figures.
https://www.fire.tc.faa.gov/pdf/ct86-21.pdf
James
Collectin' Camaro's since "Only Rednecks drove them"
Current caretaker of 1971 LT1's - 11130 and 21783 Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
https://plus.google.com/photos/112392262205377424364/albums?banner=pwa

cook_dw

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Re: Octane boost
« Reply #28 on: March 13, 2020, 02:55:06 PM »
Do you run any oil additive (Marvel Mystery Oil) to your avgas?  I personally use Renegade Racing Fuel - Pro 110, 112, 114 & 116 and they are leaded.

firstgenaddict

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Re: Octane boost
« Reply #29 on: March 16, 2020, 03:02:31 PM »
No but 100LL has lead, about half as much as SUNOCO 110.
James
Collectin' Camaro's since "Only Rednecks drove them"
Current caretaker of 1971 LT1's - 11130 and 21783 Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
https://plus.google.com/photos/112392262205377424364/albums?banner=pwa

 

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