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Old 16 March 2007, 05:46   #1
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high octane and optis

can anyone see a problem with running a merc optimax 200hp on shell vmax or the equivelant from bp.
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Old 16 March 2007, 06:11   #2
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can anyone see a problem with running a merc optimax 200hp on shell vmax or the equivelant from bp.
The cost?
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Old 16 March 2007, 07:28   #3
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Would the higher octane rating not mean your engine would produce the 275 you paid a lot of money for, for more of the time ?

I've considered this for a new suzuki 150 on a ribcraft,would it produce more or smoother power using superunleaded. Turbo'ed Subaru's (Japareeze) do run smoother. Some car's ECU's alter timing etc, based on the octane rating of the fuel, I'm wondering if this capability is engineered into outboards.



would it make a difference to a two Stroke? Etec 175's on another rib.

Does anyone know for certain?






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The cost?
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Old 16 March 2007, 11:01   #4
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Would the higher octane rating not mean your engine would produce the 275 you paid a lot of money for, for more of the time ?

I've considered this for a new suzuki 150 on a ribcraft,would it produce more or smoother power using superunleaded. Turbo'ed Subaru's (Japareeze) do run smoother. Some car's ECU's alter timing etc, based on the octane rating of the fuel, I'm wondering if this capability is engineered into outboards.



would it make a difference to a two Stroke? Etec 175's on another rib.

Does anyone know for certain?
I agree it makes sense for my Verado when ambient air temps are high but the question was about an Opti which I do not believe requires Super Unleaded...
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Old 16 March 2007, 11:44   #5
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We used superunleaded a couple of times in our honda 150 just to see what happened, the extra cost was only 4/5 for our 120litre tank so not so noticeable. It did seem smoother and sound more refined and quieter, probably in my head but just what we thought.

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