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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%
Voters: 4524. You may not vote on this poll

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  #1771  
Old 17th August 2019
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Maxeffort Maxeffort is offline
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Originally Posted by Renecito View Post
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.
Detonation in simple terms, is violent, uncontrolled combustion in the cylinder.

It is a destructive force that can cause major engine damage to multiple engine components.

You hear detonation, often called “pinging”, “rattle” or “spark knock”, most often at lower RPMs and under load. If you roll on the throttle and hear a rattle, ping, or knocking sound, you are hearing detonation. The detonation will stop when you back off the throttle. You may also see evidence of detonation on the spark plugs.... Little gray specs on the porcelain. Those are bits of aluminum from the piston.


With 87 octane, my bike will detonate fiercely when taking off from a stop, two up, on an incline. I will also hear some detonation rolling on the throttle between 2-3000 RPM on an incline, especially on a hot day.

If you never hear any pinging or rattling and your spark plugs do not have gray specs on the porcelains with 87 octane, there is no advantage to running higher octane... but if it makes you happy, there’s no harm in it.
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  #1772  
Old 17th August 2019
boomerguy boomerguy is offline
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Quote:
Originally Posted by Maxeffort View Post
Detonation in simple terms, is violent, uncontrolled combustion in the cylinder.

It is a destructive force that can cause major engine damage to multiple engine components.

You hear detonation, often called “pinging”, “rattle” or “spark knock”, most often at lower RPMs and under load. If you roll on the throttle and hear a rattle, ping, or knocking sound, you are hearing detonation. The detonation will stop when you back off the throttle. You may also see evidence of detonation on the spark plugs.... Little gray specs on the porcelain. Those are bits of aluminum from the piston.


With 87 octane, my bike will detonate fiercely when taking off from a stop, two up, on an incline. I will also hear some detonation rolling on the throttle between 2-3000 RPM on an incline, especially on a hot day.

If you never hear any pinging or rattling and your spark plugs do not have gray specs on the porcelains with 87 octane, there is no advantage to running higher octane... but if it makes you happy, there’s no harm in it.
My owner's manual and my factory service manual state that the 1200 REQUIRES premium fuel due to its higher compression ratio so it's no surprise you had pinging/detonation.

My 883 requires 87 octane at a minimum. However, since I bought the bike last year, I haven't tried it because it is 10% ethanol around here. The only non-ethanol I can get is in 90 octane and I keep my red gas cans in my shed, as well as my mowers, weed eater, leaf blower and Sporty full of it. (STIHL products require 90 octane anyway). I top it off after every ride.

I've only topped off my tank once while on the road and I had to use 87 octane - 10% ethanol. I found no difference in performance but the tank still had about a gallon of the good stuff in it, so I can't say it was a good comparison.

The 90 octane non-ethanol costs an average of $.30 more per gallon but I don't even consider the difference. After all, I get up to 50 mph on trips (usually less since I wind out the mountain twisties) and the lawn tools require it anyway.
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  #1773  
Old 19th August 2019
THEWILDONE THEWILDONE is offline
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Quote:
Originally Posted by 60Gunner View Post
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
Mostly agreed, with the minor exception that (in my subjective case at least) ethanol is no problem in anything I've run it in as long as it gets burned and doesn't sit around.

Quote:
Originally Posted by Maxeffort View Post
Detonation in simple terms, is violent, uncontrolled combustion in the cylinder.

If you never hear any pinging or rattling and your spark plugs do not have gray specs on the porcelains with 87 octane, there is no advantage to running higher octane... but if it makes you happy, there’s no harm in it.
This ^^

No harm other than wasting money if the machine truly doesn't need it. My '03 1200 gets nothing but 87 (and sometimes E10 87) and never bitches about it.


Quote:
Originally Posted by boomerguy View Post
My owner's manual and my factory service manual state that the 1200 REQUIRES premium fuel due to its higher compression ratio so it's no surprise you had pinging/detonation.
It's compression dependent as I believe various years of 1200s had higher compression than others. There is a sticker on the frame of my mostly stock '03 1200 from HD specifying 87 octane (or higher).




------------------------------------





Knock, detonation, ping, etc is not something to; know nothing about. Some good info in the above posts, among others regarding this.

Knock, detonation, ping, etc if left unchecked, could destroy an engine, as also mentioned.

Do an internet search for images using various keywords such as: busted ringland, ringland knock, detonation, and any combination of these words and/or others.

I run my homebrew turbocharged SBE 6.0 LS engine with 91 octane and VERY conservative timing for this very reason, I don't want to flirt with detonation.


Ways to combat detonation are: Higher octane, water/methanol injection, E85 (85% ethanol) and probably countless others that I am not personally aware of.... Now still the point stands, running higher octane than required for a SPECIFIC and PARTICULAR setup will essentially, be OK...... But your cache of beer money will be less.......
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  #1774  
Old 19th August 2019
cousincletus cousincletus is offline
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You'll hear it ping, esp. when letting out the clutch on a hot day if the octane is too low.
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  #1775  
Old 19th August 2019
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My 1200 roadster diesels with anything other than premium. If you want good gas look for Top Tier gas. You can get it at most stations. Kroger shell or bp that’s just a few. Since deregulation cheap gas has fewer detergents and additives. Use the right octane but buy top tier


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  #1776  
Old 19th August 2019
shanneba shanneba is offline
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I didn't see Kroger listed as a top tier licensed brand.

https://toptiergas.com/licensed-brands/
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  #1777  
Old 20th August 2019
hammer6315 hammer6315 is offline
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adnauseam!
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  #1778  
Old 20th August 2019
boomerguy boomerguy is offline
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Quote:
Originally Posted by Bobm1152 View Post
My 1200 roadster diesels with anything other than premium. If you want good gas look for Top Tier gas. You can get it at most stations. Kroger shell or bp that’s just a few. Since deregulation cheap gas has fewer detergents and additives. Use the right octane but buy top tier


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The pumps will have a label on them identifying them as Top Tier. A couple more are Citgo and Exxon.
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  #1779  
Old 20th August 2019
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Citgo is on the list near the top. That's where I get my 91 pure gas.
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  #1780  
Old 20th August 2019
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Citgo is on the list near the top. That's where I get my 91 pure gas.
Citgo: ain't a venezuella company?
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