Is 110 Octane fuel safe to run in S&S Stock 117 Motor

[Dark Knight]

I am curious if 110 Octane will cause damage to the 117 S&S motor without mods . Whats the Best fuel to run in the motor that does not cause knock or run the risk of potenial engine damage due to detonation from higher level octanes. That burn slower without increased spark to ignite or burn the fuel faster

Dark Knight

 

[liferider]

try 100 octaine AV gas

 

[KaptinAmerika]

Per the S&S Engine service manual
***************
FUEL
The gasoline used in your SSW+ engine should have a minimum octane rating of 91. Do Not use fuel additives and try to avoid consistent use of methanol or ethanol blended fuels.
***************
Your motor was designed to run on High Octane Pump Fuel 91-97
Running racing fuel is not a good as your motor wasn't designed for racing.

Are you having particular issues that lead you to believe you need higher octane fuel.

Avgas/Jet Fuel
Pay particular attention to the additives section, see statement above from S&S Engine Manual, and the Piston Engine section

 

[KaptinAmerika]

If your having Knock/Pinging problems then you need to look at your jetting and Ignition.
I have an S&S 124 non-EPA version in my K9
The stock ignition module was causing serious pinging under hard acceleration.
I installed the Thunderheart Programmable Ignition module. Set it to "4" and all pinging went away. Eventually, after my custom pipes are installed, I am going to have a local hotshot tuner I know put it on the Dyno and tune everything for maximum performance and reliability.

 

[Wills67]

I think the hard part now is finding gas without ethanol...

 

[07bigdog]

I was told if you use too strong of an octane boost, it could damage the liner in the fuel tank. Not sure if high octane fuel will do the same.

 

[KaptinAmerika]

I was told if you use too strong of an octane boost, it could damage the liner in the fuel tank. Not sure if high octane fuel will do the same.

Good point, it will definitely eat the liner.
I was only going after the motor issues.

 

[CHOPTOP45]

I am curious if 110 Octane will cause damage to the 117 S&S motor without mods . Whats the Best fuel to run in the motor that does not cause knock or run the risk of potenial engine damage due to detonation from higher level octanes. That burn slower without increased spark to ignite or burn the fuel faster

Dark Knight

I'd listen to what curtis is telling you.

 

[firedog19]

You are just wasting your money as it will give no benefit

 

[Iman]

try puregas.com it will list all the non ethonal gas stations in your area. If there are any!!

 

[KaptinAmerika]

You are just wasting your money as it will give no benefit

I agree

to the extent that if you have pinging it will probably get rid of it but like prescription drugs there will be a bunch of bad side effects

 

[DynoDave]

try puregas.com it will list all the non ethonal gas stations in your area. If there are any!!

I think the site you are referring to is;
Ethanol-free gas stations in the U.S. and Canada

 

[awg]

The station I goto doesn't have a sticker on the pump stating it has ethanol. Am I to believe it does? I thought they had to post a notice or something stating its in the gas.

 

[Korupted1]

You can burn the valves by using too high of an octane.
Try not to exceed 100.

 

[Macdwn]

If the station you go to is a high volume/gallon user they may not state it because they do not know at what time their buying ethanol blended fuel. I believe anything over 10% blend has to have the sticker. Wikk just depend on whats cheaper when their buying.

 

[liferider]

I still think the 100 octaine av gas is safe, if not please explain why.

 

[KaptinAmerika]

I gave a link in an earlier post that explains it.
AV is designed for a different type of piston engine and loaded with additives which is one of the things S&S specifically states not to use.

 

[DynoDave]

To eliminate the problems with ethanol you could use Star Tron;

 

[Moespeeds]

Only if you don't try to drink it.

 

[Brew]

So, White Lightening is out of the question?