"Octane for dummies" - Page 3 - Yamaha Raptor Forum
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post #21 of 74 (permalink) Old 08-30-2007, 06:42 AM
 
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Re: "Octane for dummies"

Hi peeps

I am form South Africa and only recently found your site and I must say found a lot of info on issues I had. Especially with the limiter in reverse.

Now we have 93 and 95 unleaded at the pumps at R7.00/l = that would be like $1.00/l

what would you say I use then

Keep up the good work!!!
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post #22 of 74 (permalink) Old 08-31-2007, 12:31 AM
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Re: "Octane for dummies"

US gasoline octane numbers are reached by the (R+M)/2 formula while much of the rest of the world uses RON (Research Octane Numbers) alone meaning that a gasoline in a pump in the US would have a lower number on the sticker than identical fuel in a pump outside North America.

The vast majority of discussion you see on here about octane and compression will be using the US equation for octane ratings so just remember that our 93 octane may not behave the same as your 93 octane.

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post #23 of 74 (permalink) Old 09-27-2007, 06:13 AM
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Re: "Octane for dummies"

Quote:
Originally Posted by Mad Dog
US gasoline octane numbers are reached by the (R+M)/2 formula while much of the rest of the world uses RON (Research Octane Numbers) alone meaning that a gasoline in a pump in the US would have a lower number on the sticker than identical fuel in a pump outside North America.

The vast majority of discussion you see on here about octane and compression will be using the US equation for octane ratings so just remember that our 93 octane may not behave the same as your 93 octane.
Mad dog, do you know the comparison between AV gas Octane and Octane ratings for land vehicles


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post #24 of 74 (permalink) Old 09-27-2007, 07:38 PM Thread Starter
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Re: "Octane for dummies"

http://forums.atvconnection.com/arch...-470770-1.html
answer-

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post #25 of 74 (permalink) Old 09-27-2007, 08:22 PM
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Re: "Octane for dummies"

Yes Av gas is more consistent but it is formulated to burn longer. This could cause serious heat problems in some engines. Lead may also be a problem. 100LL (Low lead) has more than twice the lead automotive fuel has and could cause buildup problems. Aviation have different timing and clearance specifications and compression ratios than quad engines. In most cases Av gas is not a good idea for small engines. Aviation fuel is designed for aviation engines.
(Got this of the previous posts email)


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post #26 of 74 (permalink) Old 03-27-2008, 09:28 PM
 
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Re: "Octane for dummies"

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Originally Posted by pewterpecker
Anyone here tried running e85 in their rappy? It's cheaper than race gas and has plenty of knock-resistance to boot. All you would need to do is increase the fuel flow a bit to make up for the lower BTU's.
I am sure you could run it but your raptor booklet says not to run the "gasohol" it if it is more than 10%.
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post #27 of 74 (permalink) Old 04-11-2008, 11:25 PM Thread Starter
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Re: "Octane for dummies"

If you really have a full concept of how the fuel, ignition timing, compression, valve overlap...and know your static to dynamic compression, you'll be good... a few riders in here really know there $hit, especially dealing with heptane, toulene, xylene,..ect...not to foget av gas. a good steady mix prepared just for your engine will work. The problem we face is to do it as efficiently, and cost efective as possible, without sacrficing engine power or integrity.

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post #28 of 74 (permalink) Old 09-13-2008, 10:21 AM
 
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Am i able to run 93 octane in a fully stock engine with no jetting or other mods?
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post #29 of 74 (permalink) Old 09-13-2008, 01:09 PM
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Quote:
Originally Posted by DSSRaptor View Post
Am i able to run 93 octane in a fully stock engine with no jetting or other mods?
you do not need to run 93 in a stock bike, 87 or 89 is perfectly good, there is NO power gain from higher octance

01 rappy-what i got left of the part out https://www.raptorforum.com/forums/sh...114#post658114

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post #30 of 74 (permalink) Old 09-13-2008, 08:29 PM
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I have 720 stroker with 11:1 compr. and i was using 93 oct. pump gas, but I'm thinking to go with 12:1 compr., so, 93 octane would be fine or I have to go with higher oct? Thanks.
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