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Thread: First post by long time lurker and big fan of the site with an octane question

  1. 12-11-2015, 08:14 AM #1
    RSR RACER
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    First post by long time lurker and big fan of the site with an octane question

    picked up an RS tribute that has a rebuilt fresh '78 3.0 liter in it. What octane is most desirable and is 10% ethanol damaging in any way?

    TIA and glad to finally have my own long hood
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  2. 12-11-2015, 09:04 AM #2
    72targa
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    Welcome. Do you know the compression ratio?
    Peter Kane

    '72 911S Targa
    Message Board Co-Moderator - Early 911S Registry #100
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  3. 12-11-2015, 12:25 PM #3
    pu911rsr
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    You don't want to run gas with ethanol in that car - hard on CIS.
    Phil
    Early S Junkie # 658
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  4. 12-11-2015, 02:59 PM #4
    RSR RACER
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    Quote Originally Posted by 72targa View Post
    Welcome. Do you know the compression ratio?
    Its stock 8.5:1
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  5. 12-11-2015, 03:02 PM #5
    RSR RACER
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    Quote Originally Posted by pu911rsr View Post
    You don't want to run gas with ethanol in that car - hard on CIS.
    Phil
    Having a hard time locating non-ethanol fuel on Long Island NY.

    "pure gas " app has none listed in the greater nyc area.
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  6. 12-11-2015, 03:06 PM #6
    Mr9146
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    Quote Originally Posted by RSR RACER View Post
    picked up an RS tribute that has a rebuilt fresh '78 3.0 liter in it. What octane is most desirable and is 10% ethanol damaging in any way?

    TIA and glad to finally have my own long hood
    Not sure where you're located, but the simple answer is run the highest octane pump gas you can - 91 or 93 depending on location. Ethanol gas won't hurt you as long as the car doesn't lay too long ... the ethanol isn't nice to rubber seals or plastic fuel lines and it doesn't keep well. But if you use the car regularly it won't matter...

    Congrats on the purchase. Use it well.
    -Marco
    SReg. #778 OGrp: #8 RGrp: #---
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    Searching for engine #907495 and gearbox 902/1 #229687
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  7. 12-11-2015, 03:15 PM #7
    RSTarga
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    There is no non ethanol gas available in most states.
    David

    '73 S Targa #0830 2.7 MFI rebuilt to RS specs
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  8. 12-11-2015, 03:18 PM #8
    RSR RACER
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    Quote Originally Posted by Mr9146 View Post
    Not sure where you're located, but the simple answer is run the highest octane pump gas you can - 91 or 93 depending on location. Ethanol gas won't hurt you as long as the car doesn't lay too long ... the ethanol isn't nice to rubber seals or plastic fuel lines and it doesn't keep well. But if you use the car regularly it won't matter...

    Congrats on the purchase. Use it well.
    Thanks

    Fortunately, my cars don't sit so I hope to negate any long term deterioration.
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  9. 12-11-2015, 03:48 PM #9
    1968DT
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    Not sure where you are located...one fuel option

    Also, over on the Pelican - I have read some excellent posts about fuels by Steve Weiner of Rennsport Systems - very knowledgeable.

    I've looked all over Houston for a retail station w/o ethanol, and this is the refining capital of the world, no luck.
    MBR #2637
    AKA boschdog
    1968 911 Normal Coupe
    Houston, Texas
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  10. 12-11-2015, 04:37 PM #10
    RSR RACER
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    I used to be able to buy 112 octane leaded from a local race shop that sold VP fuels. I'll see if they have anything that I might put in just for the winter to minimize any untoward breakdown of materials
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