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Suggested octane for 80's small block motors?

Discussion in 'Small Block' started by Skivo, Mar 2, 2021.

  1. Skivo

    Skivo Tuned and Synch'ed

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    Hi all, I have a 1980 V50ii with abnormal combustion. The service manual states 100 octane, which I have gathered is based on research octane (RON). By my calculation this is approximately 95 octane based on the AKI (R+M)/2 used here in the States. Currently I'm using "clean" supreme 93 octane (AKI) and adding octane booster to achieve roughly 95 octane.

    Is this the approximate octane I should be using in this motor? I'd love to hear success stories or issues experienced with fuel in similar motors. Thanks!
     
  2. V700Steve

    V700Steve GT Reference GT di Razza Pura

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    I've found no need for more than the 93, in fact if you have real gas w/no ethanol at 89 or 90 it'll be fine.
     
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  3. Skivo

    Skivo Tuned and Synch'ed

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    Thanks for that info Steve. I do have "no ethanol" supreme 93 around the corner from my house. I use it exclusively when I'm not traveling.
    The 100 proof fuel I started out with proved to be too much for this V50 motor and wouldn't combust properly. I've dropped it to 93+octane booster. I'll try straight 93 and see how she runs...

    What year/model is your bike?
     
  4. V700Steve

    V700Steve GT Reference GT di Razza Pura

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    Back in 85 I had a V50III, I road it a couple thousand mi and sold it. Traded my Fiat spider Sport for it, back to the previous owner of it. He wanted my SP 1000 so I got a nice Fiat he worked on. The V50III was his wife's and she quit, riding almost new too. I already had a 84 LMIII and 70 Ducati Desmo 350.
     
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