Anyone one use octane boost?

[Ed255fsh]

My marina mandated no more "self fueling" boats.
They sell 87 octane. Across the way has valvtech gas but I don't know if they offer 93 .
So thinking booster additive.
Any suggestions? I don't really want to carry around cases of 8oz bottles .

 

[Julian]

I've wondered about these octane boosters....has anyone found some that work and is cheap...wondering if it would be cheaper to buy a booster than pay the ridiculous upcharge they have for premium these days!

 

[biffdotorg]

I've wondered about these octane boosters....has anyone found some that work and is cheap...wondering if it would be cheaper to buy a booster than pay the ridiculous upcharge they have for premium these days!

Julian, you still have a 242X? Why boost above 87? Many buying higher octane are just avoiding ethanol. Not to start a debate, but yours should not really benefit from octane alone. Am I wrong in thinking this?

 

[FSH 210 Sport]

My marina mandated no more "self fueling" boats.
They sell 87 octane. Across the way has valvtech gas but I don't know if they offer 93 .
So thinking booster additive.
Any suggestions? I don't really want to carry around cases of 8oz bottles .

First thing I’d do is find out if Valvetech has premium. 93 is too much anyway all you need is 91.

I’m assuming you wet slip or slip your boat? Best prices for fuel is a land service station.

Depending on your situation you might just get a five gallon can of 105 or 108 VP fuel and mix it in the correct proportion with 87 to make 91. I mix 85 & 91 to get 86 all the time.

Octane Mixture Calculator

 

[Babin Farms]

When I wet slipped I would pull the boat out, take it to the station and fuel it up to avoid the +$1 up charge for fuel at the marina. Marina owner didn’t like it but there was nothing saying I couldn’t.

 

[FSH 210 Sport]

Julian, you still have a 242X? Why boost above 87? Many buying higher octane are just avoiding ethanol. Not to start a debate, but yours should not really benefit from octane alone. Am I wrong in thinking this?

No.

87 and 91 octane fuel have the same btu’s per gallon. The difference between the two fuels is the amount of anti knock, 91 has more anti knock / octane than 87 because it is meant to be used with engines with higher cylinder pressures, like a SVHO engine with its super charger.

Running 91 octane fuel in an engine designed for 87 octane actually decreases performance because the 91 octane burns slower than 87 octane due to the lower cylinder pressure of that engine, ergo, less pressure is produced in the cylinder. Temperature in the cylinder also increases due to the extended burn time, this is slight in this scenario but still happens. One is just paying more money for fuel than needs to.

Running 87 in an engine designed for 91 will cause detonation and damage / destroy that engine.

 

[Bottom Bracket]

A cap full or 2 of this stuff because of gas pumps.
Might rev a touch quicker.
Carry it with on multiple day trips.
My Samurai loves this stuff. head gaskets not so much.

 

[FSH 210 Sport]

A cap full or 2 of this stuff because of gas pumps.
Might rev a touch quicker.
Carry it with on multiple day trips.
My Samurai loves this stuff. head gaskets not so much.

Since you’re raising the octane of the fuel, it will burn slower, ergo, the engine will rev slower.