A two-stroke engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston during one power cycle, this power cycle being completed in one revolution of the crankshaft. In a two-stroke engine, the end of the combustion stroke and the beginning of the compression stroke happen simultaneously, with the intake and exhaust functions occurring at the same time. Another form of rotary inlet valve used on two-stroke engines employs two cylindrical members with suitable cutouts arranged to rotate one within the other – the inlet pipe having passage to the crankcase only when the two cutouts coincide.
STIHL machines such as chainsaws are designed to be run on 2-stroke fuel in a 50:1 fuel to oil ratio if used with their own 2-stroke oil. Stihl recommends 50:1 with their oil and 25:1 with any other brand oil. Comparing regular lubricating oil with two-stroke oil, the relevant difference is that two-stroke oil must have a much lower ash content.
To mix the fuel, first pour the engine oil and then the petrol into a suitable can approved for use with fuel. Before pouring this mix into the fuel tank, first mix it thoroughly by shaking the can. Take care when opening the can as pressure may have built up inside.
Some pro saw users don’t realize that low octane fuel not only reduces a pro saw’s performance, but can damage its engine. The only thing you really need to know about octane is today’s pro saws need fuel with a minimum octane of 89. An even better way to store a saw engine is to remove the fuel as described, and then partially fill the tank with a product like 50 Fuel.
The larger number represents the amount of gasoline, while the smaller is the amount of oil needed. If you are treating 1 gallon of clean unleaded gasoline, a 50:1 ration translates to 2.5 ounces of two-cycle oil, while preparing a 40:1 blend calls for 3 ounces of oil. It’s best to use the premixed gas within a few days and to shake it well anytime it’s been sitting for a while to redistribute the oil completely into the gas.
what petrol for chainsaw Related Question:
What petrol does a chainsaw use?
STIHL machines such as chainsaws are designed to be run on 2-stroke fuel in a 50:1 fuel to oil ratio if used with their own 2-stroke oil. The engine gets it’s lubrication from the oil that’s added, not from the neat fuel and the percentage ethanol content will not change this.
Can I use regular gasoline in chainsaw?
A chainsaw uses regular unleaded gas but it needs to be mixed with the right oil. Most chainsaws use pre-mixed gasoline-oil. Oil is mixed in with the gas to lubricate the engine and prevent fouling.
Will my chainsaw run on E10 petrol?
We recommend in all of our owners’ manuals that you should only use high-quality brand-name petrol with a minimum octane rating of 90, but we can reassure you that petrol with an ethanol content of 10% or less, like the new E10 petrol will not cause a problem with your STIHL petrol tool.
What petrol should I use for STIHL chainsaw?
STIHL recommends storing a 2-cycle fuel mixture prepared using E10 fuel for no more than 30 days in order to minimize phase separation. In this context, “phase separation” means: the ethanol absorbs moisture from the air and settles to the bottom of the canister. This can cause engines to run roughly or not at all.
Can I use 2 stroke oil for chainsaw?
Modern two stroke chainsaws do not require generic brand oils to operate at temperatures and rpms that are comparable to those of generic brand oils. Our recommendation is to use only high quality two stroke oil designed for air cooled high performance engines when using your modern two-cycle engine.
Can I use chainsaw without oil?
Without lubricant, the speed at which the chain moves over the chainsaw bar can cause some serious friction. A slowed-down chain and excessive fuel burning mean there’s a lot of friction between your bar and chain, which means a lot of heat is being produced that could do major damage to your saw.
What happens if you put straight petrol in a 2-stroke?
What Happens When You Put Regular Gas In A 2 Cycle Engine? An engine without cylinder lubrication would soon become a NO-stroke. The mixture of gasoline and lubricants provides the cylinder with lubrication.
Do you mix gas and oil for chainsaw?
Most STIHL gasoline-powered equipment runs on a 50:1 mixture of gasoline and 2-cycle engine oil. Knowing the proper way to mix your fuel is the first step in keeping it running strong and long.
Is E10 petrol OK for 2 stroke engines?
We recommend not using Euro 95 E10 in tools with two-stroke engines. Two-stroke engines don’t handle aggressive ingredients as well. In addition, two-stroke engines run smoother if you use an oil mixture. Your tool’s manual will tell you exactly which oil-to-gasoline ratio you need.
Can I use E10 petrol in my Husqvarna chainsaw?
E10 can be used in all current Husqvarna equipment, however, we recommend using at least 89-octane E10 gasoline, which is the mid-grade between regular and premium gasoline.
What octane is E10 fuel?
If you haven’t guessed, ‘E10’ means 95 octane fuel sold on UK forecourts will now be required to contain up to 10% of bioethanol in its mixture.
What is super unleaded petrol?
What is super unleaded fuel? Super unleaded fuel is typically a higher-octane version of regular unleaded fuel. This means it has a higher-octane rating. Ordinary unleaded usually has an octane rating of around 91 Research Octane Number (RON). Super unleaded usually has a rating between 97 RON and 99 RON.
Why does E10 fuel damage engines?
E10 petrol’s higher bioethanol content is corrosive to rubber parts, gaskets, seals, metals and plastics, which causes engine damage, so it could dislodge deposits in older engines and fuel systems, causing blockages. It should only be used with expert advice, which means pretty much never.
Which UK fuel has no ethanol?
Esso Synergy Supreme+ 99 contains zero ethanol, except (for logistics reasons) sites supplied from Scotland, North Wales, North England and Cornwall.
Can you use 10w40 in a chainsaw?
You can but it’s not very good for the chain or the environment. The Husqvarna / Stihl stuff is much thicker and vegetable based so it doesn’t fling off the chain as easily or poison your garden! 10w30. Thicker.