A different kind of Non-Ethanol Question...

[Recoil Rob]

Excuse me if this has been covered but I did several Google searches and did not get the answer to my question.

I have a Duranautic 14 with an early 1983 2 stroke Evinrude 15hp tiller engine, E15RLCTR. I have been using regular old ethanol 89 octane in it. I had it overhauled and have found a place that sells non-ethanol gas in 5 gal cans so I'd like to start using it. The boat doesn't get used a lot of hours, only short runs for clamming, so price is not an issue.

However, the gas is Sunoco race fuel and listed at 95 Octane. Is this too much octane for this engine?


thanks,

Rob

 

[rolmops]

These engines prefer 89 octane. Using that high an octane may lean out your fuel/air mix. Chances are that you will have to adjust your carburetor.
It would be better to just stick with the ethanol fuel which is fine for your engine in spite of all the popular anti-ethanol doomsday opinion which is supported by opinion but not by facts, although the ethanol mix does raise your fuel octane a little bit.

 

[82rude]

pass the popcorn.:laugh:

 

[Barnacle_Bill]

Keep using the 89 octane.

 

[JimS123]

I have the same motor, though a 1984 model year. It has run on 87 octane for 31 seasons now, the last 20 or so have been E-10. After 60 years of boating, this motor has been the most reliable and trouble-free of any motor I ever owned.

The '84 owners manual specifically states to use "regular" unleaded, and furthermore says that up to 10% ethanol is approved. I have other motors that have had the gas tank gauge float destroyed by ethanol, but the OEM tank that came with this motor still works pefect.

Personally, I see no need for 89 octane premium, nor any need to avoid E-10.