Does octane matter?

Discussion in 'Motorized Bicycle Trouble Shooting' started by Cylon, Apr 6, 2017.

  1. Cylon

    Cylon Member

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    Does octane matter? Even with a low comp head?
     
  2. Drewd

    Drewd New Member

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    Only on an air cooled engine especially in warm weather while under load. Hot temperatures, high engine loads, carbon build up on pistons all contribute to possibility of detonation which is harmful to an engine. High octane helps reduce the risk of detonation in these circumstances.

    If the engine is watercooled then not so much with a low compression head.

    Also remember that adding oil to gasoline reduces its octane rating which can also lead to detonation.
     
  3. 87octane

    87octane Member

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    I wonder if there are any advantages to adding marvel oil to the fuel on my huasheng 4 stroke???
     
  4. dmb

    dmb Active Member

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    91 is fine is worth the extra cents, race gas...smells good.use when 170+psi or your be sorry.
     

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