Force 85hp Octane?

[ExtremeRodney88]

Just got a boat, quickly to realize it’s mechanics are a much different breed than cars and other small engines. I’ve done all kinds of work to get my 88 Marine Force to turn over, and I’ve heard different opinions on Octane rating. In my area, I’ve got E85, 87, and 91. I use 87 in just about everything I own, and the owners manual I believe says to use 87. I’ve had other people suggesting I use 91. What kind of additives are recommended as well? Thanks

 

[jerryjerry05]

Burn 87 and you can use Ethanol if that's what you can get.
Burning premium 91+ does exactly that BURN it burns hotter and the flash point is later(I think) .
It can do damage and most outboards, it's not recommended.

Ethanol use the Star Tron or equilevent treatment for E
The BEST thing you can do is keep the tank full when not using, condensation occurs when there's extra space and the heat goes up and down with the sun. Keep the boat in the shade if possible.

Google 87 vs 91 and the effect it has on outboards.

A small water separating filter by the motor or a clear filter by Fram G-2, G- 3 G-12 That filter between the pump and the carb.

IF??? you get water in the gas?? Try "boat stove alcohol" It absorbs a lot of water and will burn with some water in it.
Most drug store alcohol has water in it already.

Also add the appropriate amount of oil when you add anything to the gas.

 

[jimmbo]

Your engine will run just fine on 87.
Make sure to use a Good TCW-3 oil at 50:1.
Higher Octane Fuel burns Slower, and it probably burns at a slightly lower temp, and has a Lower BTU value(less energy) per Volume than Lower Octane Fuels
There are some Decarbon Tools sold that can be used to soften and purge carbon from behind the Rings, Mercury Engine Tuner, and the BRP equivalent are good ones.
There are various other Snake Oils being sold,

 

[jerryjerry05]

CARS.COM — The only guaranteed result of using premium gasoline in an engine designed for regular-grade fuel is that you will spend more money on gas. As far as any tangible benefits to filling up with pricier gasoline, the chances are slim to none.

Related: More Maintenance Coverage

If your engine runs fine on regular, filling it with premium is unlikely to boost acceleration or fuel economy by more than insignificant amounts. No matter what you’ve heard, premium-grade gasoline won’t do more to clean deposits from your fuel injectors or other parts of the fuel system because today’s regular gas contains the same detergent additives.

The main difference with premium is its octane rating — 91 or higher compared with 87 for regular octane. The higher octane gives premium gas greater resistance to early fuel ignition, which can result in potential damage, sometimes accompanied by audible engine knocking or pinging.

 

[ExtremeRodney88]

Awesome thanks everybody! So a 50:1 fuel ratio puts me at 2.6 quarts per gallon, and I’ve got a 21 gallon tank. ****, that’s a lot of injector oil!

 

[The Force power]

as Jimmbo said; Make sure to use a Good TCW-3 oil

 

[Redbarron%%]

50:1 for 21 gallons is 21/ 50 = 0.42 gallons. 1.68 quarts, 53.76 OZ., 1.6 liter. for the 21 gallons
Check my math, please

 

[jimmbo]

Manuals used to read 1/6 of a pint(16 oz) for each Gallon(US) of gas, so...16 oz of oil per 6 US Gal works out to 56 oz for 21 gals

US gallon is 4 US quarts so 32 oz X 4 equals 128 oz/gal(US) so 6 gallons is 768oz, 50:1 works out to 15.36oz oil per 6 gallons., so 21 gals would mean 53.76 oz of Oil

So for ease of measurement, most will go with 56 oz...

For us Canuks, an Imperial Gallon is 160oz, a Quart being 40oz (Which why Cars in Canada always got better Gas Mileage than the Cars in the US). so 50:1 worked out to exactly 16 oz per 5 gallons

 

[roscoe]

Well, I can throw out some number jumble too.


2.6 ounces oil per gallon of gas.

Yes, get something to measure the oil accurately.

Otherwise, you will likely be "adding a little extra oil" every time you add ten gallons of gas.
Over time, you will end up with way too much oil in the fuel.

Extra oil is not needed, recommended, or useful.
It can actually cause problems.


A 500 ml plastic graduated cylinder, like the one you used in 7th grade science class,
works great. I keep one in my oil tote.

 

[jerryjerry05]

1 pint to 6 gal.
2.666 oz. to a gal.

Use any TCW3 oil from any source?
I use Walmart oil.
Also at Walmart is a plastic bottle with lines and instructions for amounts of oil to the amount of gas .

 

[ExtremeRodney88]

Awesome, thanks for the help guys