87,88,,91 octane? | Page 6 | Victory Motorcycles: Motorcycle Forums

87,88,,91 octane?

Discussion in 'Tech Q&A' started by sean rrt, Mar 15, 2015.

  1. Pauljp

    Pauljp Well-Known Member

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    Maybe it's just me, but I have noticed when I run 87 octane that my mileage per tank really goes down.
    When I use 89 octane it goes back up to normal.
    Basic Canadian metric numbers, with 89 I get about 400 kms per tank, and with 87 I get about 300 kms.
     
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  2. wvrider1

    wvrider1 Well-Known Member

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    I run mid grade always. Octane needs are based on compression true? At 9.4 compression, do you really need 91-93 octane? Most you folks burn 87 in the family truckster with the same compression. JMHO, YOMV. :beer3:
     
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  3. Tenax66

    Tenax66 Active Member

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    I dont think its just you..thats a substantial difference. In mixed driving on both 89 & 91 with 2 tanks gone in my new magnum, 440km to empty
     
  4. rodhotter

    rodhotter Well-Known Member

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    my 13 hammer gets top tier premium 93 oct always, with corn unfortunately, but a new station just opened this week locally advertising no ethanol + they pump all the fuel, gotta check the octane though!!!
     
  5. Flyboy

    Flyboy Well-Known Member

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    I find that Gate in my part of the Country uses 89 octane crapanol free, but others list theirs as 87. So as @rodhotter says, pay attention. Mine seems to run better on 93 octane, but it has non-efficient corn squeezings in it... So if the Scooter is going to sit or a couple weeks, I use the 89 Marine fuel.
     
  6. huberei

    huberei Active Member

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    Well, in switzerland you only get 95 or premium is 98 octane... for the same engines like you have...
     
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  7. rodhotter

    rodhotter Well-Known Member

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    when the local shell now sunoco went from no corn to 10% eath i lost about 5 mpg on average with my traded 1200 porkster!! our government subsidizes corn + we pay for it + get stuck with less mpg + other issues using it!!
     
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  8. WHITE_VIC

    WHITE_VIC Well-Known Member

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    I doubt you lost 5 mpg when they switched
     
  9. rodhotter

    rodhotter Well-Known Member

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    i know it seems like a lot, but i was hitting 60 before, solo + casual on an 06 1200 porkster, later i only seen mid 50's. not a critical computation because motorcycle mpg's matter little to me!!!
     
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  10. scottie409

    scottie409 New Member

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  11. rodhotter

    rodhotter Well-Known Member

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    heat affects octane requirements as it does oil as well!! ester oils which are group V true synthetics resist breakdown better than any other type of lubricant + they are said to reduce engine temperatures as well!!
     
  12. scottie409

    scottie409 New Member

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    I have a 13 Vision with cams, wheel and power commander. I put 8000 kms in about 7 weeks and was running regular gas.
    I found that I had difficulty using 6 th gear except on flats with no load on engine otherwise it would ping and sound like ****.
    I switched to 91 high test and it made a huge difference in drivability. Now using overdrive is a pleasant experience. I will try to run mid grade to see if it will still be ok. I can't believe how much better it drives on High test.
    Your truckster is water cooled therefore manages heat better
     
  13. rodhotter

    rodhotter Well-Known Member

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    water cooling is helpful but many systems are undersized. most manufacturers tune more aggressively + use higher compression ratios as well, so using higher octane especially in heat + of course if you drive slow locally which negates most of the water cooling unless you have a BIG fan cooling your heat soaked cooling system, + of course high heat kills oils much quicker unless its Ester based oil!!
     
  14. rman

    rman Active Member

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  15. rman

    rman Active Member

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    Ethanol is used as an octane booster. That is what keeps the fuel from igniting too early. Instead of burning it allows the fuel to compress then explode in essence producing more power over (91 over 89) even though lower octane has more energy. It is just more
    efficient in higher compression motors that require it. It is said that the use of 91 in a lower compression motor will produce carbon build up. The detergents in the fuel today should reduce that build up. As everyone says here, if you don't have pinging or other motor noise use the lower octane as using higher octane does nothing for your motor, just bleeds your wallet.
     
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