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SilverGriz
Well-known member
91 octane or higher is recommended. I run 92 octane in Idaho since that is our premium fuel.
What grade of octane people run in the 800R
- Thread starter summitdan
- Start date
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badass1000
Well-known member
ok. so how come you can bump your compression up a couple points and still run 91 octane at higher elevations? 
Your engine will always make the most hp possible with the lowest octane gas without detonating.
Are you really going to notice much difference from 91-87? No. only a hp or two difference. So if you feel like spending a extra $2.00 or so every time you ride just to play it safe that is fine. I run maverick, flying j, whoever is cheap 87 octane in my stock xp. Saves about $4.00 a ride over chevron premium. Add another $4 for diesel at the cheap place over chevron and I save $8 every ride. Adds up when you ride 2-3 times a week when the snow is good. I have never had a fuel problem.
Your engine will always make the most hp possible with the lowest octane gas without detonating.
Are you really going to notice much difference from 91-87? No. only a hp or two difference. So if you feel like spending a extra $2.00 or so every time you ride just to play it safe that is fine. I run maverick, flying j, whoever is cheap 87 octane in my stock xp. Saves about $4.00 a ride over chevron premium. Add another $4 for diesel at the cheap place over chevron and I save $8 every ride. Adds up when you ride 2-3 times a week when the snow is good. I have never had a fuel problem.
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90 is the highest you can get here in Alaska at most stations. Some sell race gas. I add 10oz of Klots Octane booster per each tank to give me 92.5.
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badass1000
Well-known member
Your smoking crack.
I run 91 in my m7 with m8 kit, and high compression heads. I run strait c16 in my turbo drag bike when I really crank it up at the drag stip. Run pump 91 up to 8lbs with 9-1 compression ratio and water injection on the street. Never had a problem with any of my sleds or bikes in over 10 years from detonation. I run higher octane where it is needed. It is not needed on a stock compression sled ran at 6-7,000' and up.
I always laugh at the guys on sport bikes too that have to run premium because the sticker on the bike says too. Laugh at the ones that run higher octane race gas in their stock street bike because it makes it faster. Funny how they run so slow and their mph is down. They maybee came to the track once when the corrected atmosphere was really good, ambiant temps were down, or their was a tail wind and they ran a mph or two faster that day with av gas in the tank. Now they always run it and swear it is faster.
I got several other buddies that run maverick/flying j 87 in their stock sleds with no problems.
Matter of fact I got one buddy who has alot of piston and crank problems in his 800 rmk and all he runs is chevron supreme.
It must be because he runs chevron supreme.....
I run 91 in my m7 with m8 kit, and high compression heads. I run strait c16 in my turbo drag bike when I really crank it up at the drag stip. Run pump 91 up to 8lbs with 9-1 compression ratio and water injection on the street. Never had a problem with any of my sleds or bikes in over 10 years from detonation. I run higher octane where it is needed. It is not needed on a stock compression sled ran at 6-7,000' and up.
I always laugh at the guys on sport bikes too that have to run premium because the sticker on the bike says too. Laugh at the ones that run higher octane race gas in their stock street bike because it makes it faster. Funny how they run so slow and their mph is down. They maybee came to the track once when the corrected atmosphere was really good, ambiant temps were down, or their was a tail wind and they ran a mph or two faster that day with av gas in the tank. Now they always run it and swear it is faster.
I got several other buddies that run maverick/flying j 87 in their stock sleds with no problems.
Matter of fact I got one buddy who has alot of piston and crank problems in his 800 rmk and all he runs is chevron supreme.
It must be because he runs chevron supreme.....
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I have a slightly milled head and the dealer told me 91 would be fine. He also suggested you never know about the gas locally and recommend one gallon of race fuel which is 110 to make 92 as a little insurance. I sure like the smell of race fuel. I always ride over 6000'.
Octane rating
Basically the octane rating is the ability of the gasoline to not predetonate at higher temperature and compression. The higher the octane, the higher the compression and the more you can advance the timing. I don't enen know what the compression ration is on the 800R is but I have ran mine on both 87 and on 91 and on midgrade. I ride mainly between 4-7k. The electronics on the motor can tell the difference and must be retarding the timing on the lower octane fuel. I see a 5-600rpm loss on 87 vs mid/premium fuel. I can also tell the fuel economy is slightly less on 87- I can noticibly feel/tell the difference. I am probably the cheapest sob ever, and I won't run 87 in mine anymore. I can't tell the difference between 89 and 91. As far as 100LL avgas- The octane rating on avgas is rated on a different scale than autogas. Back in the day when doing STC research for using car gas in aircraft, I believe that regular and ethel mixed 50/50 had about the same octane rating as 100LL. Save the airplane gas for the last ride of the year and your summer storage as it is a non parrifin based fuel and will not gunk up your carbs and tank over the summer.
Basically the octane rating is the ability of the gasoline to not predetonate at higher temperature and compression. The higher the octane, the higher the compression and the more you can advance the timing. I don't enen know what the compression ration is on the 800R is but I have ran mine on both 87 and on 91 and on midgrade. I ride mainly between 4-7k. The electronics on the motor can tell the difference and must be retarding the timing on the lower octane fuel. I see a 5-600rpm loss on 87 vs mid/premium fuel. I can also tell the fuel economy is slightly less on 87- I can noticibly feel/tell the difference. I am probably the cheapest sob ever, and I won't run 87 in mine anymore. I can't tell the difference between 89 and 91. As far as 100LL avgas- The octane rating on avgas is rated on a different scale than autogas. Back in the day when doing STC research for using car gas in aircraft, I believe that regular and ethel mixed 50/50 had about the same octane rating as 100LL. Save the airplane gas for the last ride of the year and your summer storage as it is a non parrifin based fuel and will not gunk up your carbs and tank over the summer.
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badass1000
Well-known member
here is a good read on gas for those that have the time or want to know:
http://www.idavette.net/hib/fuel/
here is some thing i found on 100ll avgas with a quick search and describes how its 100 octane rating is achieved:
http://www.dirtrider.net/forums3/showpost.php?p=23072&postcount=2
http://www.idavette.net/hib/fuel/
here is some thing i found on 100ll avgas with a quick search and describes how its 100 octane rating is achieved:
http://www.dirtrider.net/forums3/showpost.php?p=23072&postcount=2
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Flange
Well-known member
What is the octane level of the octane boost that you are running? The way I calculate it, the boost would have to be 300 octane in order for 10oz of the stuff to raise 12 gallons of 90 octane, to 92.5 octane. I'd like to see some 3rd party data to back up the claims made by these octane boost companies.
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badass1000
Well-known member
I don't have the info any more, but I know of several guys on turbo bikes that were getting Tetra-Ethyl lead from some where. They would carry it with them when on trips to boost the octane of their pump gas.
From every one I have heard it was the best octane booster to carry with you. They also said to be very carful because it is really bad for you to touch or inhale.
If wanting more then pump octane I would mix some c12 or some other good gas with some pump. On the first link I posted their is a graph showing how much higher octane gas to mix with pump to get the desired octane.
From every one I have heard it was the best octane booster to carry with you. They also said to be very carful because it is really bad for you to touch or inhale.
If wanting more then pump octane I would mix some c12 or some other good gas with some pump. On the first link I posted their is a graph showing how much higher octane gas to mix with pump to get the desired octane.
Mini fuel lesson on AVGAS (aviation fuel)
RED AVGAS is
80/87 octane - (1 gram lead per gallon) and is being completely phased out replaced with
100LL BLUE - the LL stands for low lead (2 grams of lead per gallon)
100/130 - higher grade 100 ( 4 grams of lead per gallon)
Lead is indeed present in these grades of aviation fuel (TEL). The higher the octane rating the MORE LEAD IS USED. Lead is what they use to boost the octane. General aviation aircraft typically use 100LL now, as 100/130 has too much lead and the cheaper 80/87 is a lesser quality grade and being phased out. Light aircraft engines are designed to operate at continuous 75% power as opposed to sleds that operate a lot of the time at low power and idle, with bursts to full power. Also note that 100LL is just a posted number not the actual octane rating which can have a range from 91 to 96 octane
LEAD in your SLED from AVGAS will cause a build up of carbon on your spark plugs whenever you are at low power as the lead does not disperse and bakes onto your plugs, valves and other components. The AVGAS fuel itself is more refined and better quality than general road transport grades, and your sled will run good on 100LL as it does burn clean, so long as your are holding max throttle all day.
I run 91 or 94 pump gas (MOGAS)....and I do agree keep the ethanol out of your sled..
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Interesting, I've always heard AV gas has a range from 100 - 119.
Not doubting you but no one really seems to have the same answer.
I said it before and I'll say it again, you can run whatever octane you want as long as you jet for it.
You could run 87 at sea level if you wanted, probably have to jet up 5 sizes probably lose hp and mileage but you could do it.
You can run straight 110 race gas at 10K' on a stock sled, probably have to jet down 5 sizes but that sled is running the best it possibly could also.
If you want to run 91 on a stock sled at 6k + check your plugs, they'll tell you want they want.
Remember a sled from the factory comes with "saves their azz" jetting which is usually WAY fat.
For some reason I get gas after a good Mexican feist.........
I don't know what kind it is but I don't think I want to run it in the sled, Stinky!
Chaz
I don't know what kind it is but I don't think I want to run it in the sled, Stinky!
Chaz
I mix in (2-3) gallons of 100LL in every tank of 91. Nos seems to like it.
I am guessing that you are unfamiliar with klotz products. It is is a race additive, not the crap you can buy at your local parts store. Raises numbers, not points. I run it in my blown 03 Cobra that's tuned for 93 with 0 detonation.
KLOTZ OCTANE BOOSTER
Klotz is the leader and innovator in producing Octane Boosters and still the front runner in actual numbers of octane increased per ounce and cost effectiveness. Klotz Octane Booster provides extra strength in building octane and upper cylinder lubrication. One ounce per gallon of gasoline will raise the octane 2-1/2 numbers. Proper octane level helps eliminate pre-ignition and detonation, allowing engine to run cooler and to its fullest potential.
Klotz Octane Booster is environmentally safe and provides lubrication benefits equal to tetraethyl lead. Formulated to increase octane ratings of leaded or unleaded gasoline by 10 numbers or more if desired. Klotz Octane Booster is designed as a legal additive in all types of stock class racing. Adding more Octane Booster to gasoline than needed is not necessarily harmful, but simply becomes non-effective past a certain point. No more than 120 total octane can be achieved with gasoline as a fuel by nature. Using a significantly higher octane content than required can actually reduce power, as the effect of the slow burning fuel produces less combustion pressure. Klotz Octane Booster is also an excellent gasoline stabilizer preserving gasoline up to 16 months during storage.
Tests indicate the yield these added benefits...
* 1 oz. per gallon raises octane 2-1/2 numbers - 2 to 3 oz. per gallon produces significantly racy exhaust odor.
* Helps stop pre-ignition & detonation -Absorbs water condensation
* Helps stop engine run on & Cleans Fuel injectors
* Allows higher compression ratios & increases throttle response
* Provides upper cylinder lubrication equal to lead
* Preserves gasoline in fuel tank up to 16 months
PERFORMANCE APPLICATION DIRECTIONS: One ounce per gallon will raise the octane 2.5 numbers, for racing add 3oz. per gal. of fuel. (Octane can be raised 10 numbers or more if desired). Experiment by trial and error to find the most suitable combination. To help eliminate varnish build-up in carburetor and fuel systems on a regular day to day basis, add one ounce to two gallons of gas periodically. Klotz Octane Booster has extra strength which makes it very effective & because of this it must be packaged in metal containers to maintain its strength. WARNING: DO NOT mix with Nitromethane, a violent reaction or explosion will occur. However, this product CAN be used with the Klotz NITRO Propanol additive as shown above.
STORAGE APPLICATION DIRECTIONS: Add one ounce per gallon to preserve gasoline from 6-8 months. Or two ounces per gallon for 12-16 months storage.
Flash point 125 degrees ~ SAFE FOR UNLEADED and CATALYTIC CONVERTER APPLICATIONS
TECH TIP: KLOTZ OCTANE BOOSTER FOR OXYGENATED GAS-
Klotz KL-602 Octane Booster is the perfect fix for the new government mandated oxygenated fuels in some states. These new clean burning fuels use Ethanol or MTBE (a form of alcohol/ether) and are putting racers and serious recreational users in a panic. High performance engines do not react favorably to these fuels because they tend to run lean. The chemical engineers at Klotz have the answer! Just add 1-2 ounces of Kl -602 per gallon of gasoline to control the burn speed of the gas and absorb any moisture that the alcohol will draw. This simple solution will save you thousands in engine repairs and still allow you to run your machines on the edge!
Many gas stations in the mtns sell 85 octane and the lowest in the flatlands is generally 87. Why? Air is thinner up high therefore pressure in the combustion chamber is lower. If the air at 10,000' is 30% thinner than sea level it would be rational to think the pressure in the cylinder would be 30% less, therefore lower octane would be ok for all stock engines.
Ran av gas in my stock sled for 3500miles with no issues. Only reason was because it was free
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badass1000
Well-known member
klotz kl602 is a concentrated tetraethyl lead substitute.