octane

[mosc]

should i be running 93 octane for fuel.. or is the cheapy 87 okay??

Better yet, which will benefit my bike most and why?

[Wishbone]

Run the lowest octain you can with out knocking.

What motor, compresion ratio, how many cylanders, how its cooled all make a difference.

If you run higher than what you need its like pissing up a rope.

[OreoGaborio]

Ever hear of the term "RTFM"? It stands for "What does your manual say?"

[bryco13]

my owners manual says i can use 87, and at these prices why pay for the extra if it isn't going to help.

[MotoFreak]

Run the lowest octain you can with out knocking.

What motor, compresion ratio, how many cylanders, how its cooled all make a difference.

If you run higher than what you need its like pissing up a rope.

Which means run 91/93 octane in that beast...high out-put engine means running the good stuff...cause running the lower stuff is like pissing up the rope, then hanging yourself with it!

[butcher bergs]

...high out-put engine means running the good stuff...cause running the lower stuff is like pissing up the rope, then hanging yourself with it!

Incorrect.

[MotoFreak]

Incorrect.

correct me sir

[Wishbone]

Incorrect.

Eggs act lee

I just returned my friends 73 Vette that has a 454 with 8.25:1 compression. It runs great on 87


My 02 fz1 turns the best numbers (tried and true by a pro tuner) on 87. Has I think a 11:1 compresion ratio or maybe a 10.5:1 I forget off hand.


My 03 Acura TL needs 91

SO reffer to my first post.

[MotoFreak]

why does your Honda NEED 91, and your Bee run fine on 87?

[OreoGaborio]

because that's what those engines were designed to run on.

hense... "RTFM". Use what is suggested in the Owner's Manual... PERIOD. Anything higher is nothing a waste of money.




I hate octane threads.

FWIW, The owners manual for my Aprilia says 90 PON or better. (Pump Octane Number which is R+M/2). I use 89 and it runs like a champ on it with no detonation at any RPM or load.

[brewmaster]

Do a search on octane on this site. There have been a few of these threads in the past.

[OreoGaborio]

Do a search on octane on this site. There have been a few hundred of these threads in the past.

fixed.

[Evil_Weasel]

"RTFM". Use what is suggested in the Owner's Manual... PERIOD. Anything higher is nothing a waste of money.

I hate octane threads.

why is it such a hard concept to understand???

[OreoGaborio]

why is it such a hard concept to understand???

Because... "Well if it's more expensive... IT MUST BE BETTER!!!"

[Evil_Weasel]

if that was true we would all own ducatis and be awaiting valve adjustments.

[brewmaster]

Thanks for the fix Pete!
Here's a good one for you
Read me

[OreoGaborio]

Thanks for the fix Pete!
Here's a good one for you
Read me

and as always, TLRMan is spot fukkin on.

[butcher bergs]

correct me sir

Combustion chamber shape/ design, for one, has all but eliminated the need to run a refined fuel such as 93 in a relatively high compression engine such as a motorcycle's. Combustion chamber design has opened new doors to many engine makers.
There are software programs that exist which aid in acheiving decent engine efficiency (meaning "horsepower") using lower octane fuels.
The higher octanes have a more refined and consistant burn compared to the lower octanes.
93 is harder to light up when compared to 87. It takes more of something to get 93 to burn efficiently.....more spark, compression, air, etc.
That's why you typically see turboed vehicles running 93 or higher, for example.

Of course it's a bit more in depth than this but the basic idea is there.

[Nikon]

i don't have a manual

[mosc]

MANUAL SAYS NOTHING LESS THEN 90...

[Evil_Weasel]

well there you go than...looks like you are stuck with the expensive stuff.

[OreoGaborio]

or just use 89 for a bit & see how it likes it, like I did

[BostonSVkid]

My trumpet says 89 in the manual so that is what I run.