question for all---i know HD recommends using 93 octane fuel.
no prob there
but if i am able to get 100 octane, cani us it?
Is it good, bad?

 

Unless you tune the ignition and/or compression to take advantage of the octane, it will not help.
It will cause issues if you use it over the long term by creating carbon deposits on your pistons.

 

The octane in gasoline is a rating pertaining to its resistance to detonation. Running a higher octane than is recommended will not provide any more power or better driveability. However, the higher octane fuel is usually cleaner and over the long term will probably result in slightly less carbon buildup. Not really worth the extra expense for a daily driver unless the compression warrants it.

 

thank you, kinda figured that (what you guys said). just wanted someone elses thoughts

 

The higher the octane rating the less likely the fuel will experence premature combustion, or “knocking.”

As the octane rating lowers, it converts more energy to heat rather than power as it burns.

I run high test in my Low Rider. It runs 97 octane in this area. I filled my tank for $9.55 the last time around.

 

If the 100 octane you have in mind is 100LL aviation gas, it will ruin your engine. It has lead and modern low compression engines can't handle any fuels with lead. Lead deposits will build up very fast, damaging the engine.

Any 91-93 octane pump gas runs fine in the HD.

Steve

 

Me thinks if you look again at the octane rating you will find it says '91' not 93.

WD

FTR- I tried the Torco race fuel in my SERK 95" and it made the pipes white and looked cool, but did nothing for the performance....good grade of 91 is all they need, unless you are running very high compression.

JMHO[8D]

 

on the west coast there is 91, on the east coast you have 93 octane.

 

Some Shell stations near Chicago have both 91 and 93. Hmm. Of course everytime there's a gas pinch, we take the brunt cuz the upper midwest has different EPA requirements than some other places, at least that's what "they" say.

 

I've wondered... with these single-hose, grade selectable switches on the pump, is that hose still full of the low-grade stuff from the previous customer. I know it doesn't much matter when pumping 20 gallons into a cage, but does the amount in the hose, if any, degrade the high-test that I'm buying in these smaller bike tanks?

(I've also wondered... is there any other consumer product in this country that's sold by tenths of a cent. Can you buy one tenth of a cent of gas?)