octane rating

It seems to me that 89 octane has been working just fine, 87 works great also. the 92 is hard to start and makes it hard to ride due to excessive power.
octane booster for the most part, if you get the cheap stuff is basically upper cylinder lubricant. 10 points equals 1 octane rating, so nos racing formula octane booster(raises octane 60 points) when added to 92 octane gas would equal 98 octane. and 14 dollars gets a 12 oz bottle, which treats 16 gallons of gas. as you can see 10 points equals 1 octane rating. when added to 87 octane gas would make 93 octane, and 92 octane is close for 20-30 cents per gallon more.

87 cents per gallon to make 87 octane into 93 octane. I think I will stick with the 92 octane for 20-30 cents more.

donthaveakawman wrote: 87 cents per gallon to make 87 octane into 93 octane. I think I will stick with the 92 octane for 20-30 cents more.

higher octane gas is harder to ignite, but burns more thoroughly. If I remember right I read up on gas octane from the 60's I think it was, and the octane rating was about a hundred. probably due to lead and 12 to 1 compression on a factory car.

i run 90 octane non ethanol in mine with no problems

Octane doesn't make power by itself.

donthaveakawman wrote:

donthaveakawman wrote: 87 cents per gallon to make 87 octane into 93 octane. I think I will stick with the 92 octane for 20-30 cents more.

higher octane gas is harder to ignite, but burns more thoroughly. If I remember right I read up on gas octane from the 60's I think it was, and the octane rating was about a hundred. probably due to lead and 12 to 1 compression on a factory car.

Calculated compression, actual compression was 9:1

Lot's of overlap kills compression, and that's how they were able to advertise those high compression numbers.

Accounting for overlap is dynamic compression, which no one ever advertises. Companies still advertise regular (static maybe?) compression, which doesn't account for the valve effects. Leaded gas definitely allowed for higher CR back when that was what was being used. That said, we're able to get those CR's out of modern engines without it do to fancy things like direct injection and variable ignition timing.

Doesn't make sense to advertise dynamic compression, since it's one of the first things people will change if they start tuning, or if you have an engine with VVT.

one would think anywhere short of 10-1 compression would be fine with 87 octane, its just the thing with the tachometer and when I take it to the nine the bike smells funny, I think it burns oil.