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Old 07-21-2010, 08:09 PM   #61
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Old 07-21-2010, 08:09 PM   #62
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Quote:
Originally Posted by bluewave18 View Post
Wow. Thats all news to me. No wonder I run 103 or higher on the spray. I have only worked in refineries for the past 15 years.

What are these "certain occasional conditions" that cause "your" knocks? If you dont mind me asking
Sorry BlueWave but I think he's right. Octane by definition is a measure of a fuels resistannce to detonate.


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The octane rating is a measure of the resistance of gasoline and other fuels to detonation (engine knocking) in spark-ignition internal combustion engines. High-performance engines typically have higher compression ratios and are therefore more prone to detonation, so they require higher octane fuel. A lower-performance engine will not generally perform better with high-octane fuel, since the compression ratio is fixed by the engine design.
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Old 07-21-2010, 08:57 PM   #63
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Originally Posted by bumblebee View Post
Sorry BlueWave but I think he's right. Octane by definition is a measure of a fuels resistannce to detonate.
I am not trying to argue the definition of octane. Im fully aware of what it means and how its calculated. Glad we got to the bottom of the ratings meaning. Let also consider that those numbers are actually a min. required. Lets ponder the thought of the actual reading being higher than the absolute min. required. I do know this to be the norm.
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Old 07-21-2010, 09:05 PM   #64
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Old 07-21-2010, 09:27 PM   #65
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The topic has been played out on every forum including this one many times with the same result. The ultimate answer is....Run the lowest octane needed to prevent knock.
If you get a perceived knock go one rating higher. I have not ridden a bike that knocked on a top tier brand 87 at stock comp. ratio. I have known reputable mechanics and tuners that swear by 87 (on stock CR). I have seen 87 sprayed on with no knock or evidence of detonation. I wouldnt spray on 87 though. Im done with this discussion.
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Old 07-21-2010, 09:42 PM   #66
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Yes higher Octane is resistant to detonation
The old big Cubic High compression engines of yester year needed High Octane and the lead also help slow the detonation.

Today engines are far better control thruogh electronically metered fuel delivery and timing, Considering that and the smaller displacement, there is far less chance of pre detonation across those small piston surfaces, even with the high RPM.

Therefore Lower Octane can be used and get the best perfromance.

Follow the Owners manul and listen to the engine if one of the modifications make it ping bump up the Octane.

You might also look into reading Spark Plugs.

I had an O8 Busa as I recall it was to use 92 Octane or Higher note 08's and up have higher Comp than 07 and ealrlier
I had an 03 1200 Bandit it was to use 87 as I recall, I added a 5 degree timer and found slight pinging at low end speeds, increased the Octane an it was fine.

Thats my 2 cents

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Old 07-22-2010, 04:36 AM   #67
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Quote:
Originally Posted by bluewave18 View Post
The ultimate answer is....Run the lowest octane needed to prevent knock.
Exactly
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Old 07-22-2010, 06:13 AM   #68
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Quote:
Originally Posted by po-po 5.0 View Post
All gas comes from the same spigot. The only difference between what you buy at any one station from any other station is detergent package (added into a tanker after filling from the common spigot) and alcohol content.
I have heard this, and I believe it. The only time I ever noticed a difference (and I'm talking about gas mileage) was in Cali. One thing about the old mom and pop stores though, I have heard that old tanks can leak water into the fuel.
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Old 07-22-2010, 06:16 AM   #69
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Old 07-22-2010, 06:27 AM   #70
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I remember people making fun of the OP for starting this thread, but I have learned a of a lot on it.
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Old 07-22-2010, 08:44 AM   #71
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OK. I know how to read spark plugs for rich/lean. How the do you read them for detonation (other than the obvious missing electrode)?
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Old 07-22-2010, 08:52 AM   #72
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http://roadstarclinic.com/content/view/70/127/

http://www.centuryperformance.com/sp...g-spg-192.html

http://www.moparmusclemagazine.com/t.../photo_06.html

http://www.theultralightplace.com/sparkplugs.htm
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Old 07-22-2010, 08:54 AM   #73
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Alright, just what I thought. You look for broken plugs.
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Old 07-22-2010, 08:58 AM   #74
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There are signs of minor detonation too though

In cases of light detonation, small black or gray spots will be noticed on the core nose of the spark plug.
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