Which octane is best?

M

marlboroninja

Recruit
Joined
Jun 18, 2006
Messages
3
What octane is best to run in a 1993 90HP Johnson? Would 93 octane improve its performance or hurt the engine. I know in other two cycle engines, such as dirt bikes, the higher octance enhances performance.<br /><br />Thanks.
 
B

Brew2

Chief Petty Officer
Joined
Jan 12, 2004
Messages
427
Re: Which octane is best?

Do a search on the word "Octane"...you'll have enough reading/opinions to last you a while.<br /><br />I believe the general concensus is that 87 octane is fine and that the higher octane fuels really don't do anything for you in an outboard. <br /><br />Cheers.
 
D

Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: Which octane is best?

. . . . . <br /><br />(Little marks from people touching this with a 10 ft pole)<br /><br /><br />Just kidding Mr. Ninja, 87 is fine for that motor as long as it's stock, as produced. Boat motors don't have the luxury of a transmission to keep them in a "friendly" rpm band at all times like land vehicles. Just set it up at 5800 with an average load and you'll be fine. <br /><br />Also good oil and Champion plugs will keep it running a very long time.
 
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danje197

Cadet
Joined
Jul 6, 2006
Messages
7
Re: Which octane is best?

Here in sweden our only choice is 95,96 and 98 unleaded. Howcome the low octane rates in your country/ies ?
 
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