filo_gost
26.05.2021 23:24:28
Nothing at all like guy said about vegetable oil. If that were the case, your fueling would be inconsistent and engine would seize up very quickly. It's probably partly why they call it premix. here
See full version: Two stroke oil question- how does it separate
Nothing at all like guy said about vegetable oil. If that were the case, your fueling would be inconsistent and engine would seize up very quickly. It's probably partly why they call it premix. here
"It's a function of temperature. The gasoline is simply boiled off leaving the 2-stroke oil as the residue in the crankcase." more
Ever put vegeteble oil in water? Notice how its like bubbles of oil sitting on the water?
Joined: 1/31/2018
Yz229 wrote: It does mix, and separates partly due to the flash point. That's why a lot of times, all else being equal, some oils you get . more here
Plugs should not foul at richer ratios if you are using high-quality oil in the mix. High-quality oils will have a good detergent/dispersing package that holds down the contaminants which produce plug fouling. A typical example: you go from a 50:1 ratio to a 20:1 ratio. Your engine will now run leaner, and you’ll have to make jetting changes. You’ll need bigger (in number) jets because the oil molecules are thicker and the flow rate (the amount coming through the jet) is less. Aha! The volume of fuel has changed. The oil takes up some volume that the gas used to occupy, so your engine is getting less gas and needs to be richened up. more
All the major manufacturers produce two-stroke racing engines in their off-road motorcycles. Virtually all of them recommended 20:1 or 24:1 mix ratios. [links]
Our advice is to buy a quality oil and run it at a moderate ratio. We’ve used 32:1 for many years. In race bikes that are ridden hard, we might go a trifle richer at say … 28:1. For a trail bike, 40:1 would be the way to go, assuming that you used a quality oil. If you own a mild-mannered bike, consider a 50:1 ratio. here
Actually, you can get more horsepower out of a two-stroke engine with enough extra oil in the gas, because the oil provides a better ring seal and, therefore, more compression. People think that gas burns more efficiently with less oil, and therefore you get more performance. It almost makes sense if you look at that one statement alone.
At the end of five weeks the fuel is 5% heavier and the fuel air mix will contain more fuel. This means your engine will run richer possibly resulting in fouled spark plugs and higher fuel consumption.[links]
For your two stroke garden equipment you can get away with leaving it a bit longer, but if you’re having trouble with pull starting, you’re best to throw out the old fuel and start with a fresh batch. more
But they also state that fuel store in a fuel tank only lasts about a month: [links]
“When two stroke fuel is mixed correctly it has the same storage requirements as petrol. Problems arise when excessive two stroke oil is added. Under this condition the oil may separate from the fuel.”here
There were a couple of times where I had to drain the tank where I’d left half a tank or more for over 2 months, there wasn’t enough volume left in the tank to dilute the stale fuel. Your only option is to drain or syphon it out and use it for cleaning in the shed. here
Opinions on how long a container of pre-mixed 2 stroke fuel will last for varies significantly, some say it is only good for 3 – 4 weeks and others up to 2 – 3 months. In my experience it depends on the motor, but all motors will perform best with a full tank of freshly mixed fuel.
Phase Separation describes what happens to gasoline containing Ethanol when water is present. When gasoline containing even small amounts of Ethanol comes in contact with water, either liquid or in the form of humidity; the Ethanol will pick-up and absorb some or all of that water. When it reaches a saturation point the Ethanol and water will Phase Separate, actually coming out of solution and forming two or three distinct layers in the tank.
We recently were called to consult for a fleet where a fairly large number of vehicles were being regularly fueled from a single tank and about one-half the vehicles were stored inside and the other half were stored outside. After a night with a 30�F+ temperature drop, several of the vehicles stored outside developed problems with significant amounts of water found in the vehicle tanks. After checking the storage tank and finding no measurable water, they looked for other possible causes including sabotage. After looking at many possible causes this customer consulted with us and we were able to describe the Phase Separation through temperature change scenario and determine that this was the most likely cause of the problems.
For Seasonal vehicles and equipment, e.g. boats, personal water-craft, motorcycles, classic cars, ATV�s, RV�s, lawn and garden equipment, gasoline powered generators, and so on, we recommend that you try to use conventional gasoline without Ethanol whenever possible and particularly prior to storage.