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Old 06-28-2013, 02:25 PM   #1
TINK OP
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Question Octane Booster, CA gas not cutting it...

Anyone using octane booster in there airhead?

I'm in California and the piss poor excuse for gasoline in this state is causing PROJECT-S (1979 R100RT) to ping on heavy acceleration and at cruise (5th gear)... when I'm too lazy to downshift.

I use only Chevron 91 pump octane exclusively.

Anyone? Anyone? Bueller?

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Old 06-28-2013, 03:39 PM   #2
Airhead Wrangler
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This might sound a little counter-intuitive, but come buy some Mexican gas. Pemex is still 100% dino-derived. You can also retard the ignition a hair or richen up your mixture (or both), but that'll cost you gas mileage. Dual plug it if it's not already.
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Airhead Wrangler screwed with this post 06-28-2013 at 04:59 PM
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Old 06-28-2013, 04:33 PM   #3
disston
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Put a shim under each cylinder. Really the best solution. Pinging or pre-detonation can cause damage. Until then run Octane Booster, but you'll get tired of that.
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Old 06-28-2013, 06:07 PM   #4
ozmoses
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I recall leaded still available during my daze in CA.

Can you purchase racing fuel & use it as an "additive"?
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Old 06-28-2013, 06:15 PM   #5
robtg
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Just change the ignition advance curve or dual plug it.

Your bike is 34 years old, you have to adapt or scrap it.
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Old 06-28-2013, 06:34 PM   #6
villageidiot
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i just put a little leaded race gas in from work.

northwest corner of magnolia and adams is an auto parts store (name is eluding me) that used to sell race gas in the 5 gallon drum. i like to add a half gallon or so to a tank. the lead really helps out.
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Old 06-28-2013, 06:44 PM   #7
robtg
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They banned lead in gasoline for a really good reason. If I have to explain why, you probably won't be able to understand it.
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Old 06-28-2013, 06:49 PM   #8
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Quote:
Originally Posted by robtg View Post
They banned lead in gasoline for a really good reason. If I have to explain why, you probably won't be able to understand it.
Nice attitude there man.
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Old 06-28-2013, 06:54 PM   #9
robtg
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Nice attitude there man.
Thank you.
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Old 06-28-2013, 07:10 PM   #10
pdxmotorhead
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Quote:
Originally Posted by robtg View Post
They banned lead in gasoline for a really good reason. If I have to explain why, you probably won't be able to understand it.
Yea,, because the fuel companies wanted to increase profits and TEL is freaking expensive, if they dropped it themselves they would have been sued to mars so the Lobbied the Government to do it for them? Why be the enemy of you can get someone else to jump in..



LOL Dave
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Old 06-28-2013, 07:27 PM   #11
Beezer Josh
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When was the last time you scraped the carbon out of the heads and off the piston crowns? If there's any there, the hotspots will cause pre-detination.
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Old 06-28-2013, 07:29 PM   #12
robtg
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Originally Posted by pdxmotorhead View Post
Yea,, because the fuel companies wanted to increase profits and TEL is freaking expensive, if they dropped it themselves they would have been sued to mars so the Lobbied the Government to do it for them? Why be the enemy of you can get someone else to jump in..



LOL Dave
Like I said, if I have to explain, you probably wouldn't understand.
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Old 06-28-2013, 07:33 PM   #13
TINK OP
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Don't forget to brush, boys and girls

I have not had the heads off myself, but I believe PO did a valve job 3K miles ago so I should be good there. Looking in through the spark plug hole I can see some carbon, but I can also still see some piston head.

Quote:
Originally Posted by Beezer Josh View Post
When was the last time you scraped the carbon out of the heads and off the piston crowns? If there's any there, the hotspots will cause pre-detination.
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Old 06-28-2013, 07:35 PM   #14
BeardThrone
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Ethanol free gas in California.

http://pure-gas.org/index.jsp?stateprov=CA

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Old 06-28-2013, 07:43 PM   #15
Stan_R80/7
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Fuel additives to boost octane and even TEL are readily available for off road use. Adding fuel additives is not such an ordeal. I have added a lead substitute to the fuel for my airhead since 1990.

Here is one example: http://www.motocrossgiant.com/Produc...FUbhQgod2yUAaw

Another option is to add toluene as an octane booster or aviation fuel - but that may be more expensive. You have to decide if an additive is an acceptable long term solution or not. Dual plugging, adding a spacer, decarbonizing the head, adjusting timing, enriching the air/fuel ratio are all options. You can probably figure out what I would do, but each owner needs to make these decisions for themselves. Good luck!
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