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View Poll Results: What grade gasoline do you use?
Premium Gas 91+ octane 3,707 81.94%
Mid-Grade Gas 89-90 octane 311 6.87%
Regular 87 octane 383 8.47%
I mix it up, don't care, etc. 104 2.30%
Change based on the weather 19 0.42%
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  #1761  
Old 6th June 2019
THEWILDONE THEWILDONE is offline
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Quote:
Originally Posted by 60Gunner View Post
Doesn't it require 91? Running a lower octane than required could cause detonation.
Dont need a dyno to prove known facts.
No it does not. Sticker right on the frame from HD specifies 87 octane.


I'm very familiar with avoiding detonation. In the world of boosted home-built-hotrods which utilize a stock bottom end, it only takes a little bit of detonation to bust a ring land.


A dyno would be a great tool for quantifying said "facts".
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  #1762  
Old 6th June 2019
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60Gunner 60Gunner is offline
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Originally Posted by THEWILDONE View Post
No it does not. Sticker right on the frame from HD specifies 87 octane.


A dyno would be a great tool for quantifying said "facts".
If you feel it's necessary then fork out the money for one. As far as 'said facts', dont take my word for how the octane rating affects burns. It's common knowledge. Google it for f$%# sakes or ask the experts in the field. They'll tell ya the same damn thing. Otherwise keep throwing your $$$ down the proverbial sh!++er. No skin off my a$$.
Even with my build which requires a minimum of 91 is good on just that. I sure as hell won't be running 93 with 101 octane boost or fricken rocket fuel because I'm not naive enough to think a few more octane will make it run better or set the world on fire.
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  #1763  
Old 6th June 2019
THEWILDONE THEWILDONE is offline
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Quote:
Originally Posted by 60Gunner View Post
If you feel it's necessary then fork out the money for one. As far as 'said facts', dont take my word for how the octane rating affects burns. It's common knowledge. Google it for f$%# sakes or ask the experts in the field. They'll tell ya the same damn thing. Otherwise keep throwing your $$$ down the proverbial sh!++er. No skin off my a$$.
Even with my build which requires a minimum of 91 is good on just that. I sure as hell won't be running 93 with 101 octane boost or fricken rocket fuel because I'm not naive enough to think a few more octane will make it run better or set the world on fire.
Woah man, not sure why your panties are twisted and you're on the defensive??

And no, I am not forking out the money for dyno time. I do all my own stunts: street tuning, plug reading, WB02, datalogs etc. Now I sure wouldn't be OPPOSED to dyno time for the educational aspect but not going out of my way at this point.

All I was getting it was I personally am curious as to how much measurable difference it actually comes out to. Nothing more or less..

Run whatever gas you want, I definitely don't care
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  #1764  
Old 6th June 2019
shanneba shanneba is online now
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You could look at Sunoco Race gas tech information-

https://www.sunocoracefuels.com/tech.../beyond-octane

Beyond Octane
Overheard at the local track:

“High octane fuels burn slower.”
“My motor doesn’t need all that octane so that fuel won’t do me any good.”
“I need the highest octane so I can max out my timing.”

Unfortunately, those statements are not always true.

As a matter of fact, those statements only have some merit in the street gas world where 93 octane fuel is king and 87 is used by most.
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  #1765  
Old 6th June 2019
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60Gunner 60Gunner is offline
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Quote:
Originally Posted by shanneba View Post
You could look at Sunoco Race gas tech information-

https://www.sunocoracefuels.com/tech.../beyond-octane

Beyond Octane
Overheard at the local track:

“High octane fuels burn slower.”
“My motor doesn’t need all that octane so that fuel won’t do me any good.”
“I need the highest octane so I can max out my timing.”

Unfortunately, those statements are not always true.

As a matter of fact, those statements only have some merit in the street gas world where 93 octane fuel is king and 87 is used by most.
I agree with what they're saying. But the assumption of those here that think higher octane = more power in and of itself is pure nonsense and can actually hurt performance in some cases. I have a choice here of 91 pure gas or 93 with ethanol. The 91 pure gas is a better option for my motor.
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  #1766  
Old 7th June 2019
boomerguy boomerguy is offline
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According to my 2005 owner's manual, the 883 engine requires 87 (91 RON) and the 1200 requires 91 (95 RON) because of the compression ratios.
I run 90 octane in my 883 because that is the only octane I can get my NON-ethanol gas in near home.
When I travel farther away and get the good stuff, I try to buy TOP TIER gas and I don't sweat the octane because I know I can run 87 or higher.
For me, NON-ethanol and TOP TIER take priority. If I had a 1200 engine, I would always stick with the 91 octane.
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  #1767  
Old 9th June 2019
THEWILDONE THEWILDONE is offline
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Originally Posted by 60Gunner View Post
I agree with what they're saying. But the assumption of those here that think higher octane = more power in and of itself is pure nonsense and can actually hurt performance in some cases. I have a choice here of 91 pure gas or 93 with ethanol. The 91 pure gas is a better option for my motor.

Gunner, I know you mentioned octane booster in your last post replying to me. Just for clarification in case I didn't explain myself well enough or you didn't understand me, when I said boosted, I was referring to forced induction, not octane booster. I should have worded myself more clearly. I only later realized this.

I agree with you though, lots of people seem to be running the expensive higher octane stuff in their bikes which don't need it. I used to run 91 in my '03 1200 before I learned that in the case of my bike at least, it doesn't need it. I first experimented with filling up with 87 and was paying attention to see if it would cause the engine to knock.... I then later discovered the sticker right on my frame from HD specifying 87.

I used to have a book written by David Vizard detailing building up high performance SBCs.. I haven't seen the book floating around in years, but I remember in there he talked about doing a compression test and running some simple math to determine what octane would be required. I wish I could find it because I'd love to revisit that section to learn some more about it. It would be cool to compare say, my '03 1200 to a later 1200 and run some actual math on the compression numbers, just for fun in terms of octane requirements.....
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  #1768  
Old 12th June 2019
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Got a stock '94 XLH883 Hugger named Azül. I use Premium Unleaded, cheaper stuff when I'm really broke! jaja!

He doesn't like premium Chevron gas specifically. Makes him sick and sputter and fart with all its additives if you can believe that. I know because every time I used Chevron, he gets sick until I ride out the gas and go put some Shell or something. I thought it was because I was using the "good" stuff with all its cleaners!

Runs fine on 87 octo but I had to add carb cleaner every once in a long while and was back on with no issues. Finally rebuilt the carb, added bigger jets (for a 1200) and modded it to drink heavier as well as modding the air intake to breathe better. Everything is basic OEM stock, I just did some DIY mods. Added a Pingel petcock/filter some time back as well.

Really jumps. Been using Premium Unleaded. Haven't had any issues at all. When I'm really broke, I use the cheap stuff, but mostly I'll drop in the Premium at the local watering hole (1 hose). I've learned that my horse, Azül, likes certain things and dislikes certain things and I don't go against it, just flow with it as long as it keeps me celebrating my freedom on the road.

I do change the plugs every few months. Does it have some carbon burn when I do? Yes. Will I need to clean the heads at some point? Yes. Like all motors, it will need its maintenance. Got my ride 6 years ago, rescued from sitting in a field with a tarp on it by some guy who cleaned it up just enough to sell it for the widow and take a cut. So I know my horse will need some love and I've learned to wrench it. You take my primary cover off and after washing out the oil, you can eat off that thing, clean and shiny on the inside.

Point is, I didn't know anything about "detonation" or things like that. I just listen to my horse and the sounds he makes when I use certain things. I use good high quality oils, and that goes with what I give him to drink. This is N. Texas so it's mostly hot, and the dang gas has ethanol in it.

Sorry for the dissertation! jaja! Was bored at work and was looking for a thread to amuse myself with and stumbled upon this one. Gave me something to think about and experiment with and consider that top end cleanup. Perhaps I will split the difference and play around with mid-grade octo, but usually anything termed mid-grade just gives me a bad taste, especially when it comes to my horse. jajaja!!!!

Ride safely, stay upright and between the pipes!


From my OEM Manual: FUEL: Use a good quality leaded or unleaded gasoline (87 pump octane or higher). Pump octane is the number shown on the gas pump.

From my Clymer 86-03 Service Manual:
Fuel Type: Unleaded
Octane:
1986-1990 models Pump research octane of 89 or higher
1991-2003 models Pump research octane of 87 or higher
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  #1769  
Old 17th August 2019
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I use premium 93 octane when possible (most of the time)

In hot weather and especially two up riding, the engine will rattle under load (detonate) with 87 octane.

I’ve run it on regular 87 and in cool weather and easy solo riding, I haven’t heard it detonate.

We have 89 at the pumps and it cost almost as much as 93.
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  #1770  
Old 17th August 2019
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60Gunner 60Gunner is offline
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Running a higher octane than required isnt necessarily a good thing and can hurt performance. High octane burns slower. You would be better served to run ethanol free pure gas than running 93 in a motor designed for 87 like a stock 883
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