Octane vs HP-- - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 33 (permalink) Old 02-22-2011, 09:18 AM Thread Starter
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Octane vs HP--

I have read some posts that the lower octane fuel gives better HP & torque, this does not support that...
http://www.hotrod.com/techarticles/f...son/index.html
Also does not give a lot of favor to adding HP boosters...
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post #2 of 33 (permalink) Old 02-22-2011, 12:21 PM
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Well, they're also messing with the timing each time they change the fuel. Up to the 91 octane fuel, the results are exactly what you'd expect. Higher octane lets you add more timing and you make more power because of it.

After that, they start using racing fuel, and in their conclusion they state that racing fuel is formulated to be more powerful... so it's not only higher octane, it's also a different and more powerful formula, so I'm not surprised it behaves differently.

Interesting article nonetheless, but it seems that pump gas does behave the way we've always thought it does.
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post #3 of 33 (permalink) Old 02-23-2011, 02:38 PM
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While hte article was interesting, and I cannot make a claim to be knowledgeable on this particular topic, I will make the following statements (becuase I stayed at a Holiday Inn Express once).

In order to answer the question that was posed "Can Cheap Gas Make Power With Booster?" you would need to make the gas the only change in the equation. What they did was not only change the gas but also the timing, which renders the data unusable in the context of answering the question at hand.

I think a better title for the article would be "What timing should you ruin in your hot rod based on the type of gas" since that appears to be what they were really looking for.

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post #4 of 33 (permalink) Old 02-23-2011, 04:24 PM
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^ what he said.

I also think the general statement that the higher the octane rating , the harder the gas is to ignite....still holds true. This is of course the main reason for higher octane gas....to prevent pre-ignition...aka pinging.

There is no good reason to run higher octane gas in the Vulcan, as it was designed to run on "regular", the timing is set, and I have not read anyone reporting pre-ignition issues even using the lowest octane around.


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post #5 of 33 (permalink) Old 10-04-2012, 09:57 AM
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Ugh! Well then, I guess I've goofed by putting 93 octane in my '86 Vulcan 750! It's been sputtering ever since. I will replace with 87 octane soon! Thanks, folks.
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post #6 of 33 (permalink) Old 10-04-2012, 12:34 PM
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^ don't feel so bad I did the same.

This is my first bike I have ever owned other than a scooter. I was told that due to the age of the bike ('97) that I should run 93 octane. GUESS NOT!!!

Thanks for the info. I really enjoy this forum, it's very informative and helpful.

Good thing my tank is low I will fill up today with REGULAR.

Thanks again:-))
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post #7 of 33 (permalink) Old 10-04-2012, 02:41 PM
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I had a little over a gallon of the 93 octane left in the tank. I sputtered to the gas station and put in 2 gallons of 87. It's running better already. Whew! Won't do that again. My 454 LTD loves the 93 octane, though. I guess the Vulcan 750 is just finicky like that.
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post #8 of 33 (permalink) Old 10-04-2012, 02:48 PM
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Quote:
Originally Posted by CHerrera View Post
I had a little over a gallon of the 93 octane left in the tank. I sputtered to the gas station and put in 2 gallons of 87. It's running better already. Whew! Won't do that again. My 454 LTD loves the 93 octane, though. I guess the Vulcan 750 is just finicky like that.
When I first bought my 750, I used 91 Octane.
Found little or no difference.
....but I did NOT have the same results as you had.

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post #9 of 33 (permalink) Old 10-04-2012, 05:19 PM
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Quote:
Originally Posted by WilliamTech View Post
When I first bought my 750, I used 91 Octane.
Found little or no difference.
....but I did NOT have the same results as you had.

WilliamTech
I have used 87 &93 I notice no difference!
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post #10 of 33 (permalink) Old 10-05-2012, 09:39 AM
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The only time that your V750 knows what octane you are using is if it's too low. Then it will ping under a load. It it's hard to start then you have other issues, weak spark, bad or fouled plugs, timing or carb problems. Octane boosters, like 104+ and such are a waste of money, mostly alcohol and might boost the octane by 2 to 4 points. It takes 10 points to raise the octane level by 1. Better off just buying a 91 octane if you want a higher rating.

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