) that you would need to run the same since that's as high as it gets at normal pumps.
ocatane level
Thread Starter
Intermediate
Joined: Mar 2005
Posts: 41
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ocatane level
I have a 1969 with the high performance 350 with 11:1 compression. I live in iowa so i am able to get the ethanol that has 89 octane. I was wondering if i can get away with using the ethanol gas with 104+ octane boost additive. I have run the engine on just straight 89 octane ethanol and it ran fine. no noises. Will the octane booster help me?
Ben
Ben
Melting Slicks
Joined: Oct 2000
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From: TEXASTEXASTEXASTEXAS TEXASTEXASTEXASTEXAS
St. Jude Contributor
Octane boost is crap. Real tetraethyl lead will help, though. If you're actually running 11:1 (I doubt it), I sure wouldn't put 89 octane, ethanol or no, in it.
JB
JB
Safety Car
Joined: Jun 2002
Posts: 4,135
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http://www.radford.edu/%7Ewkovarik/p...-----------imm running it in my car, i use 1 oz per gallon to make 101 octane...its $30.00 a gallon but since im not at my home computer i dont have the web site-if your interested e mail me at carlclub@comcast.net and when i get home i'll foward you his web site........remember its banned,,, so i would advise running a few tankfuls of plain premium unleaded before going thru emissions testing
Melting Slicks
Joined: May 2002
Posts: 2,716
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From: Sulphur LA
St. Jude Donor '05-'06,'11,'13-'14,'16,'18,'19,'24, '25
If your car runs fine with low octane gas than stay with it. The lower the octane the more HP you will make as long as you can run the correct timing advance curve and not induce detonation.
Neal
Neal
Pro
Joined: Jan 2003
Posts: 642
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From: Baton Rouge LA
I have a '69 L46 car as well. I run 93 octane gas mixed with MaxLead2000. It runs great with the lead additive and no pinging. You can get it at www.maxlead2000.com.
.
.
Race Director
Joined: Dec 2000
Posts: 10,896
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From: CO
When I was a kid (26 now) my dad had a 70 with a built 400ci motor with 11:1 compression. Thing would knock on premium fuel. I would think with 11:1 you would have to run race fuel or av gas. It depends on your altitude too. At higher elevation you can use lower octane.
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Burning Brakes
Joined: Feb 2005
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Comp. Ratio
If you're engine runs on 89 octane (assuming you have iron heads) you don't have anywhere in the neighborhood of 11:1. In N.Y. we can't have over 9.8 and run properly with iron heads. Thanks, Gary
Safety Car
Joined: Jun 2002
Posts: 4,135
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Originally Posted by Paul @ Thunder
I have a '69 L46 car as well. I run 93 octane gas mixed with MaxLead2000. It runs great with the lead additive and no pinging. You can get it at www.maxlead2000.com.
.
.
Team Owner
Joined: Jul 2004
Posts: 40,338
Likes: 786
From: Redondo Beach, California
On Corvettefaq.com there's a posting that tells you how to make your own gasoline additive. The "octane boosters' in auto part stores that sell for $4 to $5 for a few ounces are really almost fraudulent. They are basically just tolulene or zylene. You can buy a gallon of tolulene or xylene for just a dollar or so more than the few ounces these additives sell for, (Don't know if I spelled tolulene or xylene correctly but i came close).
If you can get some tetraethyl lead to add to your gas that's great, but once you add the lead, I think you should also add tolulene or xylene to l really boost octane. You can buy the tolulene and xylene at hardware stores.
I used to buy Av Gas for my L88. It had 12.5:1 compression ratio stock. I milled the pistons down 0.1 inches to lower the compression ratio to 11.5:1. I mixed 5 gallons of AvGas to 15 gallons of premium pump gas.
If you can get some tetraethyl lead to add to your gas that's great, but once you add the lead, I think you should also add tolulene or xylene to l really boost octane. You can buy the tolulene and xylene at hardware stores.
I used to buy Av Gas for my L88. It had 12.5:1 compression ratio stock. I milled the pistons down 0.1 inches to lower the compression ratio to 11.5:1. I mixed 5 gallons of AvGas to 15 gallons of premium pump gas.