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post #1 of 83 (permalink) Old 05-21-2016, 01:07 PM Thread Starter
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What octane do you use? Is it really best??

Just out of conversation sake, I would like to find out what y'all thoughts were. I know the HD owners manual suggests 91 octane minimum and is what I have been doing for years in my HDs. But is it really any better, or worth the cost? I came across this video and have to say, I have my doubts. And how much 91 octane are we really pumping into our small tanks after someone pumped 87? Chances are, in my way of thinking, very little as the fuel travels a long way through hoses to get from the pump to my tank...

https://www.youtube.com/watch?v=FPPkPAbzwbU


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post #2 of 83 (permalink) Old 05-21-2016, 01:54 PM
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I just filled up with 93 octane ethanol free yesterday @ 3.89/gal. It was either that or 87.

Normally, in a water cooled engine you can get away with whatever octane will keep you from detonating. If your CR isn't too high or timing to far advanced, that usually means 87 is fine. With an air cooled engine, that doesn't necessarily hold true, as detonation is also a product of cylinder head temperature. In the winter I can usually get away with running 89. When it gets hot out, I always run 92 or better , if possible, especially if I know I am going to be doing much stop and go where the bike won't be moving a lot.
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post #3 of 83 (permalink) Old 05-21-2016, 02:33 PM
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I use the highest octane I can, as that's how I tuned the bike. And I beat on it like I'm Ike Turner.

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post #4 of 83 (permalink) Old 05-21-2016, 02:46 PM
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Quote:
Originally Posted by '05Train View Post
I use the highest octane I can, as that's how I tuned the bike. And I beat on it like I'm Ike Turner.
That is funny right there!!!!
and I do the same as far as the highest they have.
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post #5 of 83 (permalink) Old 05-21-2016, 02:59 PM
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another for the highest octane available , mostly around here it's 91 or 92 or 93 at entec , cost a bit more , but what the hay ..

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post #6 of 83 (permalink) Old 05-21-2016, 03:13 PM
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I use 93 if they have it I tried 91 and seem to get valve noise now nothing so I will stick with93


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post #7 of 83 (permalink) Old 05-21-2016, 04:25 PM
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If your compression is below around 10:1 you could probably get away with a mid grade but for higher compression I wouldn't use anything less than Premium. The octane rating is just how well it resist detonation. The higher the number the higher the resistance. If your bike has been tuned by a certified tuner I would consult them.


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post #8 of 83 (permalink) Old 05-21-2016, 04:40 PM Thread Starter
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How much of that higher octane fuel are you actually pumping into the tank though after someone filled the lines with god knows what. Probably lowest octane...I am curious to find out. Always wondered that. Even so, I still pump in the higher octanes in the bike. But pump the cheapest petro in my cage.
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post #9 of 83 (permalink) Old 05-21-2016, 05:52 PM
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I used 89 last summer to experiment. I'm about at sea level and running stock compression. It ran just fine and didn't notice any detention. The bike seemed to run hotter though. After about a month I switched back to 93.

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post #10 of 83 (permalink) Old 05-21-2016, 06:28 PM
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What octane do you use? Is it really best??

According to the WSJ article below, there is only about 1/3 gallon of previous fuel remaining in the average pump. On average, I put about 5 gallons in when I fill my tank.

Assuming 5 gallons of 93 octane being pumped in and 1/3 of a tank of 87 gas left in the pump, the octane of the fuel added is about 92.6. Well above the requirement.

Science doesn't lie, your mechanic does.

Done.

http://www.wsj.com/articles/SB122944043385810527


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