Thread: Above 91 octane, is it bad?
06-07-2007, 02:08 PM #1
Above 91 octane, is it bad?
I've got a trip lined up and I have to fill up with 87. I will be on the water for 3 days and am going to try and sneak on a few 100 octane 5 gal jugs on the boat. I can buy this from a 76 station by my house. I figured I'll throw in about 5 gallons of the 100 when I fill up around 9 or 10 gallons of 87.
According to my calculation with 10.9 gal of 87 and 5 gal of 100, I'm coming out with 91.8 octane. Although, thats a perfect mix and most likely that won't happen. Because I don't want to run anything other than 91 in my tank and that I've been told NOT to use an octane booster, is it ok if my mix turns out greater than 92 octane? What happens if my mix turns 95 octane?
06-07-2007, 02:14 PM #2
Higher octane than what is needed for the ski will mean it just might run a little slower. See if you can find 110 it should be quit a bit less $$ for you.
Octane mixing chart.
Last edited by 800AMSOIL4U; 06-07-2007 at 02:16 PM.
06-07-2007, 04:55 PM #3
My ski has seen nothing but 93 and it runs like a champ from day one. I cant imagine 95 being a big difference but thats just me opinion.
06-07-2007, 07:09 PM #4
Yes you'd be fine mixing it like you are saying. If it's a hair under or over you'll still be fine. These motors have knock sensors so if your octane is too low it will pull some timing out and you'll be safe. I wouldn't recommend doing it all the time but for a weekend you'll be fine. If you octane is too high just like 800AMSOIL4U said it'll actually run a little slower do to the slower burn rate of the fuel. If it's 95ish then you'd never see a difference but if you ran straight 100 on a stock motor then performance would suffer.
06-07-2007, 09:19 PM #5
06-08-2007, 02:00 AM #6
Hmm so anything higher is a waste of money? 93 and thats it. I only use 93 but was thinking of going higher.
06-08-2007, 08:02 AM #7
Unless I'm forgetting something, I thought higher octane always burned faster/easier.
Also....how high is too high an octane? I have also bene thinking of using octane boosters since all I get here is 91...unless I go to a station and get the 100, in which case, I was planning on mixing.
06-08-2007, 08:27 AM #8
- Join Date
- Jan 2007
- Lakeland, FL
I'm certainly no hydrocarbons engineer, but it is my understanding that a higher percentage of octane carbon chains is only used to prevent predetonation of the fuel/air mixture upon compression of the piston before the spark fires. I think no matter the octane level, the spark is going to ignite the mixture to move the piston, you just don't want it to ignite because the gas is compressed. It is such a prevalent myth that high octane gas is "better" gas, when it is only better in a higher compression engine to prevent knocking.
06-08-2007, 08:28 AM #9
Hope this helps...
06-08-2007, 08:30 AM #10
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