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Offline w8d4it

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Re: black carbon deposits around the exhaust tip
« Reply #8 on: June 28, 2013, 04:46:30 pm »
Should work and in 2-3 tanks be cleared up.  Let us know.
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Offline Trumpet

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Re: black carbon deposits around the exhaust tip
« Reply #9 on: July 07, 2013, 04:26:45 am »
What variables would make an combustion engine run better on lower octane?

I have never heard that before. I ran a tank of 87 and it seems like I lost power and the engine was somewhat less smother, maybe more noisy...but then again, I have a big imagination like anyone else who is dealing with no facts.

There was a person who claim he ran 89, the middle octane in US pumps and it ran the best. Maybe I will try that next.

One thing I notice is a little backfiring when on the decompression. I know that is due to running "wet". Then again, wet running engine run cooler.

Lots of guys in the C14 forum went to a ECM reflash that cause the engine to run leaner and thus, according to them, gained torque in the mid range rpm. That maybe, but I be willing to bet their engines was also running hotter.

These things are very difficult to ascertain because there are many factors in deciphering how well an engine in running based on fuel type. Especially one as minimal as the commercial vehicle octane. Without valid research we are all shooting the breeze here...at least I am, cause I really don't know for sure.

If I 'feel' anything different with an 89 octane tank I 'll post...
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Offline Coconut

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Re: black carbon deposits around the exhaust tip
« Reply #10 on: July 07, 2013, 08:29:27 am »
Basically :

The Octane rating is an indication of the compression that is needed before the fuel will auto-ignite.

The higher the Octane number, the higher the compression that is needed,
so higher octane rating fuels are used in higher performance, higher compression engines.

Engine manufacturers specify the fuel to use, according to the compression and design of the engine.

If you use a higher than recommended Octane rating, it is likely that the fuel will not combust as efficiently,
as it will not be reaching the optimum compression before ignition.
( Which is likely to explain the black carbon deposits on the exhaust ).

Using too low an Octane rating can result in the fuel auto-igniting under compression too early - before the spark plug fires,
resulting in the "pinking" noise, or "knock" noise, due to the fuel being ignited twice in one stroke.

Lots of motorists are fooled into paying extra for "Premium" fuels, thinking that they are getting a better quality of fuel,
or that it will make their engine run cleaner or "better" - but this is simply not correct and is a result of
the hype and marketing spin of the fuel companies calling it "Premium" in the first place !

Stick to what is recommended and you won't go far wrong !

« Last Edit: January 07, 2020, 06:25:30 pm by Coconut »

Offline davidw3d

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Re: black carbon deposits around the exhaust tip
« Reply #11 on: July 07, 2013, 02:57:57 pm »
Coconut, you have hit the nail on the head there, well explained.
Might as well as wish we had.

Offline cropbiker

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Re: black carbon deposits around the exhaust tip
« Reply #12 on: July 07, 2013, 03:12:34 pm »
Yeah, these manufacturers spend millions and many years with highly qualified test riders and grey beards in the back ground designing the engine and bike to work with a particular type of fuel...

They don't recommend one for no good reason, go with what they say is best and you will get the best out of the engine and the bike
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Offline Trumpet

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Re: black carbon deposits around the exhaust tip
« Reply #13 on: July 07, 2013, 07:49:16 pm »
Ok! I am gonna try that 89 and 87 again, a more open mind this time...
If I had money I wouldn't be on this board now
I wanna be Hefner's roommate
I trade ignorance and youth for old age anytime