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  Carbon Buildup 87 vs. 92-93 Octane Fuel

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Author Topic:   Carbon Buildup 87 vs. 92-93 Octane Fuel
Got M Hooked posted 10-30-2002 06:28 PM ET (US)   Profile for Got M Hooked   Send Email to Got M Hooked  
What will cause a higher carbon buildup, lower or higher octane fuels. AND WHY?
I've got my own thoughts of which I will share latter.
JBCornwell posted 10-30-2002 07:11 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Howdy, GMH

Carbon is the result of oil, not gas.

The most noticable difference between 87 and 93 octane is that your wallet gets light faster with the 93.

Red sky at night. . .
JB

11 footer posted 10-30-2002 07:30 PM ET (US)     Profile for 11 footer  Send Email to 11 footer     
I have find that the outboard runs hotter with higher octane. But it boes not perform much better.

11

Got M Hooked posted 10-30-2002 07:49 PM ET (US)     Profile for Got M Hooked  Send Email to Got M Hooked     
There is more to that JBC. Now Think.
Got M Hooked posted 10-30-2002 07:50 PM ET (US)     Profile for Got M Hooked  Send Email to Got M Hooked     
11 Footer, read the rpm at WOT Wide Open Throttle, You will see a difference.
JBCornwell posted 10-30-2002 09:26 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Yes, GMH. There is much more: trivia, facts and lots of mythology.

Notice that I qualified the "most noticable".

This subject will never be settled.

Are you trolling? Why ask if you are so sure?

Red sky at night. . .
JB

Got M Hooked posted 10-30-2002 09:50 PM ET (US)     Profile for Got M Hooked  Send Email to Got M Hooked     
Just touching on interesting subjects.
But here it goes:
The Octane reading is a formula based on Density. The higher the octane, the higher the density. Lower density liquid fuels are more volatile and less explosive than higher ones. This is seen in the use of gas, diesel fuel, and that of nitromethane on race cars. The Higher density fuels (like diesel and the nitromethane) are less volatile, but far more explosive. In a cumbustion cycle, fuel is not 100% burned, therefore the higher density fuels will have a higher percentage of unburned fuel during the combustion cycle, which will create more carbon.
Lower density, less power, less carbon.
Higher density, more power, more carbon.
frank_king posted 11-09-2002 09:54 PM ET (US)     Profile for frank_king  Send Email to frank_king     
lower octane fuel is more volatile, ignites easier, higher octane fuel is less volatile, takes more to ignite, higher octane fuel burns slower...must advance timing to get all the push out of combustion. to get higher octane there is more additives in the fuel

yamaha has a service bulletin out informing us that in there normal ox66 injected engine the additives are causing the o2 sensor to malfunction

frank_king posted 11-09-2002 09:56 PM ET (US)     Profile for frank_king  Send Email to frank_king     
your question..... oil plays a big part in the carbon build up. the other part is not taking care of your motor.
Wreckdiver posted 11-10-2002 06:38 AM ET (US)     Profile for Wreckdiver  Send Email to Wreckdiver     
It is my understanding that higher-octane fuel has less energy per gallon than regular does. The addition power from engines designed to run high octane comes from the greater thermal efficiency of the higher compression engine, not the fuel. I always run regular in everything designed for regular. The Mercury manual says 87 octane.
David Ratusnik posted 11-10-2002 09:33 PM ET (US)     Profile for David Ratusnik  Send Email to David Ratusnik     
If your gas is going to lay around then go with 93. Otherwise JB hits it on the head. And, if your gas is going to lay around, just go ahead and sell the boat. .03 David

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