• There has been a recent cluster of spammers accessing BARFer accounts and posting spam. To safeguard your account, please consider changing your password. It would be even better to take the additional step of enabling 2 Factor Authentication (2FA) on your BARF account. Read more here.

What modern sportbikes use 87 octane?

Regular gas has the fastest burn reactions. Higher octane gas burns in a slower controlled reaction.
Hayabusa 11:1 compression runs on 87 octane. After a TRE mod it gained few mpg to adverage near 40 mpg.
 
Well it seems the Honda F4 is one of, if not the only fuel injected bike that likes drinking 87 octane. The R6 and ZX6R specifically require premium, while the GSXR seems to do best with premium.

Thanks for the help folks!
 
929 uses 87 per the manual , runs great and has 11.3 : 1 compression . I have a car with 10.5 : 1 compression that pings like a mother if I run 87 .
 
Bronto said:
Regular gas has the fastest burn reactions. Higher octane gas burns in a slower controlled reaction.
Hayabusa 11:1 compression runs on 87 octane. After a TRE mod it gained few mpg to adverage near 40 mpg.
Click to expand...

Absolutely WRONG! Higher octane is more STABLE. And more explosive when detonated. High octane aviation fuel for constant velocity props BURN SLOWER.


BTW, IT COSTS LESS THAN ONE STINKIN' LITTLE DOLLAR MORE TO FILL UP WITH PREMIUM instead of regular on a bike. Oh well.:confused
 
http://www.hastingsmfg.com/Service Tips/detonation_and_preignition.htm
Explains well the problem.

Oil and Gasoline debates. I keep it simple cause the topic is very complexe. Starting with the molecular structure. Finishing up with standards of rating.
Molecular difference for regular and premium. Premium has more hydrocarbon connections per-molecule.
Like watching two different sizes of plastic burn. Equal by weight Premium will be a big chunk of plastic and regular a bunch of small pieces. The large piece takes longer and burns at a regulated rate.
The problem with preignition. The Smaller pieces catch fire easier. By other means then a sparkplug.
All said and done. It's the testing on a standardize one piston engine with varible compression Octane ratings are measured.
In real world it's testing the engine using different octanes the factory determines the octane rating to use.
 
thebankman said:
Well it seems the Honda F4 is one of, if not the only fuel injected bike that likes drinking 87 octane. The R6 and ZX6R specifically require premium, while the GSXR seems to do best with premium.

Thanks for the help folks!
Click to expand...

fyi, the F4i is fuel injected. The F4 has carbs. But yeah, my F4 loves 87.
 
The 600RR is listed as an 86 min octane bike.

Mine drinks 50/50 91 & VP110 like it's going out of style.... Mmmm Mmmm good!
 
from my website:

"Gasoline

The owners manual for the 600RR recommends a gasoline with a pump octane number (PON) of 86 or higher. This is the number that most gas stations use to post their octane grades. To confuse the issue, the CBR600RR's data tag under the passenger seat recomends a fuel with a research octaine number (RON) of 91. PON is equal to (RON+MON)/2, so that means that the motor octane number (MON) for the fuel should be 81.

By knowing that the MON can be anything above 81, special racing fuels can be ordered from VP Racing Fuels (which use MON) for trackdays without wasting money on an overly specialized fuel. Racing gas has the valuable property of having more energy contained in it, much more important than octane if you are not knocking. The currently favored fuel by top supersport and superstock racers is VP MR9. This fuel has a MON of 87. Go figure! VP U4 is a great option for more power gains while not being AMA Pro legal.

I will only need to run a higher octane if my engine knocks. It has not knocked yet. People waste a lot of money buying premium gas. Don't waste money."


http://www.peterverdonedesigns.com/CBR600RR.htm#Gasoline
 
Nedro, I totally realize that the cost between regular and premium is relatively small (compared to Europe where the cost of gas is perhaps four times USA prices even in the Bay Area) but if I use this bike on a daily basis for a few years, that gas cost is going to add up. I run 91 in my subaru and that thing uses a lot of gas even when driving slow, so I've decided never to buy a vehicle that demands premium again.

BTW my dad drives a new corvette and puts 87 octane in it, it doesn't ping (yet) after 7500 miles but i refuse to put anything less than premium in it. after all it's a pricey sports car and chevy recommends premium, though regular can be used if the engine does not knock.
 
o k here we go. well honestly you can run 87 octane. you probably wont ever notice a differance except on the track and even then it will be very small. you can bump up compression ratio's and run with 87 octane due to the aluminums heat absorbtion . and as far as getting more power from octane that is far from true in most but some extreme cases. since octane does not boost power but is rather a rating of it's ability to avoid pre-ignition/detonation/ pinging. as long as you dont have a detonation problem run 87 octane and save your cash . now if your running your engine at redline all the time run fast burn fuel (race fuel) most people confuse octane with burn time. well this being said i can go on and on about octane and pre-ignition. if you have an questions go ahead and shoot me pm :)
 
I wouldn't worry about running 87 octane in most bikes with electronic fuel injection. I believe there are controls that will stop detonation as soon as it starts by altering timing and fuel mixture.

That being said, I run premium in my SV and 87 in my ST. The SV is noticeably slower on the top-end when running 87, and as a small twin it really doesn't have much top-end to lose. The ST never complains, even loaded at high altitudes during the summer with the throttle pinned.
 
You must log in or register to reply here.
Back
Top