Is higher octane good or bad? - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 30 (permalink) Old 02-23-2012, 07:26 PM Thread Starter
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Is higher octane good or bad?

Here in the land of Oz we have 91, 95 or 98 octane petrol available. Is using98 octane petrol worth the extra money in a low performance engine? I use 98 in my outboard motor and a smaller bike because they use bug*er all fuel and so cost is not an issue. I don't mind paying extra for the vulcan however if it causes no harm.
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post #2 of 30 (permalink) Old 02-23-2012, 07:44 PM
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Higher octane fuel is made for long stroke engines. There for it is made to burn slower and for a longer time. Lower octane fuel burns faster and with more power. Thats why you will get a knock if you use it in any kind of high output engine. There for you should be using the high octane fuel in your vulcan and lower octane in your lawn mowers and outboards. Hope this helped. Keep both wheels down. Be safe.
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post #3 of 30 (permalink) Old 02-23-2012, 08:22 PM
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Quote:
Originally Posted by fawlty99 View Post
Is using98 octane petrol worth the extra money in a low performance engine?
Higher octane rating means the fuel is more resistant to pre-ignition (pinging). It is generally used in engines with a high compression ratio, which tend to ping under heavy acceleration.

The rule of thumb is to use the lowest octane that does not cause pinging. Check your bike's owner manual to see what octane rating is recommended.

Using higher octane than required may result in reduced performance and increased carbon buildup.

http://en.wikipedia.org/wiki/Octane_rating

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post #4 of 30 (permalink) Old 02-23-2012, 09:56 PM
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Not bad, just a waste of money. My US bike runs fine on 87 octane. I don't know what that is for imperial gallons...

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post #5 of 30 (permalink) Old 02-24-2012, 12:46 AM
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I use 87 octane on my vn2000 most of the time, using higher octane will leave less deposits in the engine because it burns faster and does not leave unburned fuel behind causing preignition, I do not see myself paying more for high octane fuel

on the other hand when I used to race desert here in so. calif. I would use 102 octane aviation fuel on my kx 250 to prevent fouling plugs
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post #6 of 30 (permalink) Old 02-24-2012, 01:52 AM
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octane

I see that under the seat of my 07 1600 classic, the fuel category states, research octane (RON) 95. While in Hays Kansas I fueled up with the highest octane available in town and added Harley-Davidson octane boost additive as per instructions on the bottle and she ran like a champ. It was 100 plus degrees that day. I have used another called liquid horse power but haven't had the same "good" results as th H.D. additive? Seems to run rough.?
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post #7 of 30 (permalink) Old 02-24-2012, 02:06 AM
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octane

I failed to mention that I changed out the air intake, added a power commander and had it dyno tuned prior to running the additives.... ?
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post #8 of 30 (permalink) Old 02-24-2012, 04:16 AM
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Kawasaki does not require a high index. I respect the user guide. I roll with 95 octane

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post #9 of 30 (permalink) Old 02-24-2012, 06:47 AM
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Owner's manual says 91 RON or above. I use 91 pretty much all the time, 95 now and again when prices are lower. When I got the bike the dealer told me to avoid 98 as the added detergents could damage motorcycle engines. He claimed to have seen very low mileage bikes that needed engine rebuilds because of valve damage caused by high octane fuels. Not sure about that as I always ran my old CBR600 (compression 12:1) on 98 because it performed noticeably worse on anything less. I certainly don't think there's anything to be gained by using 98 in the Vulcan. For what it's worth mine seems to prefer the BP fuels.
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post #10 of 30 (permalink) Old 02-24-2012, 08:32 AM
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In Belgium , 95 octane is the smallest

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