I used to run nothing but 93 and in the beginning my H2 with the first to have the cat cut off, install an Akropivic de restricted by Don Guhl and I run Brock's timing maps also....well I will tell you I switched to 89 Shell after reading one of Brock's posts. Well it was a simply amazing different bike. You could feel the power no question. I put 1000 miles on it running shell at the end of the season. I just pulled my plugs just to get a look see if I had any detanation and there was no sign what so ever. I'm not telling anyone to use 89 just stating my experience.....FOR THE LOVE OF GOD DO NOT PUT 89 IN YOUR H2!!!!!!!!!!
Octane, also refered to as 'anti-knock index' is meant to represent how well the fuel can stand up to pre-detonation (caused by heat and pressure). Cheap gas sometimes goes bang early if you squeeze it too hard in a hot cylinder. The H2's entire purpose is extreme pressue. Thats why that sticker on the tank says 'use whatever the good stuff is in your country' (I'm paraphrasing). Pre-detonation (or knock) causes things to go boom; broken rods, holed pistons and blown headgaskets are all on the table. Its fine in a car/bike with low compression, low horsepower, doesn't see extreme use and has a computer to dial it back if it starts causing problems.
If you put 89 octane in an H2 on unsubstantiated advice...that's just a terrible idea. Did you-know-who explain scientifically why he thinks that's a good idea? Its like you'd have to completely misunderstand the entire principal of forced induction and have absolutely no clue how the H2 works in addition to knowing nothing about gas. Conversely, something like a Hayabusa would probably love low octane if you tuned it right. However, If you're mixing philosophies between the H2 and big motor bikes, you're going to break some stuff.
Not saying an H2 won't run on 89. It probably will just fine while the bike is still cold or the outside air is cold. The added volatility may even be a benefit in certain conditions. However, when you get up into the high RPM range, the heat has soaked in to everything including the air box, the outside ambient air temp is up - that 89 is going to start beating your spark plugs to the punch. You start doing roll-ons in the summer heat with some nice, warm 89 octane in the tank - yikes. The computer can only intervene so much - and to know it's knocking, your engine has to do it a couple times, which is bad, especially if you have an impeller next to your nuts breaking the speed of sound. You knock enough times under heavy load, you're going to be buying parts.
(In my head that reads as friendly, conversational sharing of information directly. Its not meant to sound dick-ish. I don't know how else to say it. I swear, it sounded nice in my head. Mostly).
Shane, are you picking on me again? Just kidding, after all of these years, I probably know less about gasoline than I do about women and according to my wife, that isn't very much.I think Brock has a little more experience with fuels, than some guy who was banned and is now using a sock puppet account. Just sayin'...
LOL, no..."cliff secord" the former self-admitted "H2R". Not picking on anyone, just tired of certain people with no proven experience, running off at the mouth. Adding drama, but little else....that is the playground of these types.Shane, are you picking on me again? Just kidding, after all of these years, I probably know less about gasoline than I do about women and according to my wife, that isn't very much.
Has anyone here actually ran E85 for an extended amount of time. Seriously considering it, but not sure if the injectors and fuel pump can handle the extra volume needed to pump the amount of enthnol required for a power gain. I am changing the fuel lines to a enthnol resistant ones. I'm not sure if the fuel injector o-rings and tank gasket can handle enthnol. I would love not being the lab rat on this one.