"Octane for dummies" - Page 2 - Yamaha Raptor Forum
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post #11 of 74 (permalink) Old 04-27-2007, 08:36 PM Thread Starter
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Re: "Octane for dummies"

here is another link, more simplified, less complicated, more direct, and a lot longer.

http://www.faqs.org/faqs/autos/gasoline-faq/part3/

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post #12 of 74 (permalink) Old 05-04-2007, 12:30 PM
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Re: "Octane for dummies"

This came out of the article, u say 9.2:1 stock will run on 87octane and u tell me that my 11:1 doesnt need hight octane, well it says 104, i know temp elevation will effect it but, what were u guys trying to tell me, i just need it explained



Compression Octane Number Brake Thermal Efficiency
Ratio Requirement ( Full Throttle )
5:1 72 -
6:1 81 25 %
7:1 87 28 %
8:1 92 30 %
9:1 96 32 %
10:1 100 33 %
11:1 104 34 %
12:1 108 35 %

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post #13 of 74 (permalink) Old 05-05-2007, 10:44 PM Thread Starter
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Re: "Octane for dummies"

those are static numbers, in reality when your motor is running a 11:1 with a cam its actually pushing out around 8:1 to 9:1 at the most. so for your 11:1 static it should run (8:1 dynamic) or so. which means you should only need 92-93 or so octane..find 94 and 11.5:1 is likely, run a very aggressive cam with high flow porting and its possible to run a 12:1 on 94 octane (which is still pump in most states, sunoco). Every motor is different, therefore requires a different dynamic compression. although static compression remains the same regardless.
dynamic comp. for a 9.2:1 is around 7:1

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post #14 of 74 (permalink) Old 05-21-2007, 08:05 PM Thread Starter
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Re: "Octane for dummies"

http://www.dmperf.com/fuel_brands_an...ne_ratings.htm
Here is a link to help further understand octane, its particularly from sunoco.
The chart shows a difference in motor octane and research octane and the method thats used to label them at the pump.

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post #15 of 74 (permalink) Old 08-02-2007, 09:51 PM
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Re: "Octane for dummies"

Just put some gas in the f***ing thing and go, it is that simple a retard could do it!

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post #16 of 74 (permalink) Old 08-05-2007, 06:16 PM Thread Starter
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Re: "Octane for dummies"

put 87 octane in your $6k 14:1 compression motor and see how long it last.- Evidently you don't have one with that much money into it.

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post #17 of 74 (permalink) Old 08-26-2007, 08:20 PM
 
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Re: "Octane for dummies"

will running a higher octane rating in your atv help the engine last longer and perform better?
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post #18 of 74 (permalink) Old 08-26-2007, 10:13 PM
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Re: "Octane for dummies"

Quote:
Originally Posted by kal1fornia
will running a higher octane rating in your atv help the engine last longer and perform better?
Your atv will be most reliable and perform best when it gets just enough octane to keep it from pre-detonating/pinging, no more and no less. If your bike runs right on 89 you're not going to gain any benefit by using a similar fuel with higher octane.

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post #19 of 74 (permalink) Old 08-26-2007, 10:17 PM
 
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Re: "Octane for dummies"

thanks
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post #20 of 74 (permalink) Old 08-28-2007, 05:57 PM
 
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Re: "Octane for dummies"

Quote:
Originally Posted by DECEPTiON21
Should have read past my nose.

I run 91 octane in my internally stock rappy. I ride in Glamis, Phoenix and Tucson without problems. For an extra buck per 5 gallons, i like being sure i have enough octane.

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