high octane gas

Discussion in 'General Support' started by nickblasted2002, Jul 31, 2017.

  1. nickblasted2002

    nickblasted2002 Member

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    Hi 2002 blaster full fmf exhaust air box lid off 300 jet oil block off kit
    just wondering if i get rechambered and ported will i have to use high octane gas?
     
  2. Awk08

    Awk08 Moderator Staff Member Technician Forum Supporter

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    Depends on compression after the mod, you will need to do a compression test and octane accordingly.
    Will probably need 91 - 93
     
  3. Tooloose

    Tooloose Member

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    Get the purple gas it smells funny (114) octane, crazygood throttle responses.Not good on lower compression engines though, still smells funny, Oh yeah
     
  4. Blaaster

    Blaaster Moderator Staff Member Technician Forum Supporter

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    There is absolutely no need for 114 octane fuel, with a rechambered head,,,,, a total waste of hard earned money.....
     
  5. Tooloose

    Tooloose Member

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    That's why dragsters use regular right?
     
  6. Blaaster

    Blaaster Moderator Staff Member Technician Forum Supporter

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    Do the math, if you do not have the compression to support high octane fuel, then you not only waste money, you loose power...
     
  7. Dick Weed

    Dick Weed Member

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  8. Dick Weed

    Dick Weed Member

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    Anyone that uses high octane is doing it to prevent pre-ignition because pre-ignition does not allow the engine to make it's maximum horsepower. So they run high octane to prevent pre-ignition thereby hopefully making maximum horsepower.
     
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  9. Tooloose

    Tooloose Member

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    Thank you Mr Weed! Predetonation burns piston tops, the whole idea of using better than pump gas in racing engines, that's our experiences in the 40 year game, but what do we know? Notta lol
     
    Last edited: Aug 7, 2017
  10. Tooloose

    Tooloose Member

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    As far as wasting money goes , wasting top ends are more expensive don't ya think? Racing fuel here are 7.00 per/ gallon ,where can you even buy the gasket set for that right?
     
  11. Tooloose

    Tooloose Member

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    And it will purge the smooch right out of the powercore silencer too and the pipe✌️
     
  12. Blaaster

    Blaaster Moderator Staff Member Technician Forum Supporter

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    There is no such thing as predetonation.....

    There is pre ignition, that is before the event of spark.

    And detonation, that is after the event of spark..

    High compression demands a higher octane fuel to prevent detonation.

    Standard compression will loose power if fed with an octane rating higher than required to prevent detonation...
     
    Last edited: Aug 7, 2017
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  13. Tooloose

    Tooloose Member

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    your saying the same thing I just said why?
     
  14. speedyslyder

    speedyslyder 2 STROKES RULE Forum Supporter

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    come on ladies you are all beautiful
    the first ''reply to the question answered it''.

    if you don't figure it out from there then you will never figure it out:cool:
     
  15. Tooloose

    Tooloose Member

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    Spark knock( the low octane fuel is less stable therefore engine temp and compressing the air /fuel mix tends the diesal causing pinging or so called Predetonation
     
  16. Tooloose

    Tooloose Member

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    And thank you speedy I know I'm lovely hahaha
     
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  17. speedyslyder

    speedyslyder 2 STROKES RULE Forum Supporter

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    Haha why do car engine's have knock sensor's:D
    seriously some do have knock sensors like the hyundai elantra i owned briefly hehe
    Whats that about? Fuel cap said to run 91 minimum:eek:
    yes it is a 4-stroke engine....blah blah blah oh i just hit puberty;)
     
  18. Blaaster

    Blaaster Moderator Staff Member Technician Forum Supporter

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    My point is that there is no such thing as predetonation....

    There is pre ignition, in which the fuel charge is ignited before the event of spark....because of hot surfaces...

    There is detonation , where the uncontrolled burning of the fuel charge happens after the event of spark..

    predetonation does not exist.....there is a before and an after event of spark,,,

    Pre , meaning before....before ignition....

    Detonation, meaning
    combustion of a substance which is initiated suddenly and propagates extremely rapidly, giving rise to a shock wave....pinging....
     
    Last edited: Aug 8, 2017
  19. Blaaster

    Blaaster Moderator Staff Member Technician Forum Supporter

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    High octane fuel is not used to combat pre ignition, ( pre ignition as the words imply is before the spark occurs) it is used to stabilise the burn when using high compression.

    The burn of high octane fuel is slower and more controlled than the lower octane fuels, it is used to control detonation..when high compression is used...
     
    Last edited: Aug 8, 2017
  20. Dick Weed

    Dick Weed Member

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