Do trimmer manufactuers recommend wide open throttle or not. Do you guys trim with wide open throttle or less. I always used less than full throttle, until now I bought a new redmax and it likes running wide open. Am I going to hurt the longevity of the trimmer?
wide open throttle or not while useing a trimmer.
G. Ramey
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So why don't 2 stokes lock up at idle due to improper lubrication?
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Folks, back in the sixties when mixture was 16 to one and people were using any oil they had you needed to not run them at slow speed the plug would load up. Now with the modern engines and oil advancements you can throw all that old nonsense away. Plus they are now mixing in the 50 to one fuel to oil. What causes carbon and sludge is not running them long enough or using automotive and outboard oil. Where it builds the carbon and sludge is not so much in the hot combustion chamber, but the muffler gets clogged because it's much cooler than the engine. Running the engine at any speed the engine gets enough oil because it's mixed in the gas, running it faster I would almost think the engine may not get enough oil in certain areas due the the increase in scavenging. Run the engine according to what's needed, you don't run your car or truck engine wide open to make sure it gets enough oil. Police cars idle more than they run at any other speed and they don't carbon, it's the lack of heat to burn off the water, If you look it up the product of combustion is water, mix that with oil and there is your sludge that is why you need to run any engine long enough to bring it to full temps. Get your head out of what this old timer said to., ask him how many two strokes he had and how many he had to replace. I went into an auto parts house to pick up some two stroke husqvarna oil, they were out, the moron behind the counter said you can use any oil. Need I say more. I wont list my qualifications, you wont read them anyway. Ron Gooden
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You really think you have to use Husqvarna oil in your Husqvarna you’re a special kind of….
an analogy between a four stroke, and a two stroke is a fairytale and doesn’t apply.
should’ve had hundreds of two-stroke engines seize up because I didn’t use oil with their brand name on it.
(you do realize that none of those manufactures like Husqvarna, etc etc. made or mixed or came up with their two-stroke oil. )
revving those two strokes up with no load, using castor oil, or whatever two-stroke oil I could find.
2stroke, the engine is always getting the same ration of oil for lubrication regardless of the RPMs.
an analogy between a four stroke, and a two stroke is a fairytale and doesn’t apply.
should’ve had hundreds of two-stroke engines seize up because I didn’t use oil with their brand name on it.
(you do realize that none of those manufactures like Husqvarna, etc etc. made or mixed or came up with their two-stroke oil. )
revving those two strokes up with no load, using castor oil, or whatever two-stroke oil I could find.
2stroke, the engine is always getting the same ration of oil for lubrication regardless of the RPMs.
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Does it matter if the oil is kept in a plain black unmarked jug or not?
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Only if it’s plow fluid.
( should be revving up that cold two-stroke warming the engine up & getting it to operating temperature before putting a load on it. )
About Oil “Film Strength” and Piston Seizures - Many people believe that piston seizures occur when engine heat causes the piston to expand larger than the size of the cylinder bore.... but surprisingly this is not true.
If you could freeze your engine "in motion" in the middle of a long full throttle pass, and disassemble it for micrometer measurement, you would find the piston to measure at a .0005" to .001" press fit into the bore. That's right, a slight press fit! The reason that it doesn't seize is because the premix oil has such a terrific film strength that it acts as an irremovable buffer between the piston and the cylinder. That is, the bare metal surface of the piston never actually touches the bare metal surface of the cylinder because the oil stays between them. Many mechanics have experienced this phenomenon while cleaning a freshly bored cylinder in a solvent tank. Completely dry without any cleaning solvent, the piston moves through the bore with difficulty. However while rinsing a cylinder bore with cleaning solvent, the piston glides all the way through with no resistance at all. This is because the solvent acts as a film between the piston and cylinder.
A piston seizure can only occur when something burns or scrapes away the oil film that exists between the piston and the cylinder wall. Understanding this, it's not hard to see why oils with exceptionally high film strengths are very desirable, and why maintaining a proper oil-presence is also desirable. Good quality oils can provide a film that stands up to the most intense heat and the pressure loads of a modern high output engine. Here again, we mention that “absolutely no oil” has a stronger film strength than castor based oils.
( should be revving up that cold two-stroke warming the engine up & getting it to operating temperature before putting a load on it. )
About Oil “Film Strength” and Piston Seizures - Many people believe that piston seizures occur when engine heat causes the piston to expand larger than the size of the cylinder bore.... but surprisingly this is not true.
If you could freeze your engine "in motion" in the middle of a long full throttle pass, and disassemble it for micrometer measurement, you would find the piston to measure at a .0005" to .001" press fit into the bore. That's right, a slight press fit! The reason that it doesn't seize is because the premix oil has such a terrific film strength that it acts as an irremovable buffer between the piston and the cylinder. That is, the bare metal surface of the piston never actually touches the bare metal surface of the cylinder because the oil stays between them. Many mechanics have experienced this phenomenon while cleaning a freshly bored cylinder in a solvent tank. Completely dry without any cleaning solvent, the piston moves through the bore with difficulty. However while rinsing a cylinder bore with cleaning solvent, the piston glides all the way through with no resistance at all. This is because the solvent acts as a film between the piston and cylinder.
A piston seizure can only occur when something burns or scrapes away the oil film that exists between the piston and the cylinder wall. Understanding this, it's not hard to see why oils with exceptionally high film strengths are very desirable, and why maintaining a proper oil-presence is also desirable. Good quality oils can provide a film that stands up to the most intense heat and the pressure loads of a modern high output engine. Here again, we mention that “absolutely no oil” has a stronger film strength than castor based oils.
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About 100:1 Premix Oils - Since the 70’s there have been repeated advertising claims made by various oil brands claiming that their oils can offer suitable lubrication for competition two-stokes on a 100:1 or 80:1 premix. In many cases, these claims are “supported” by testimonials from various users. Despite the oil makers claims, and the sincerity of the testimonials … it’s not so. Running a 100:1 premix would be much like running only 2 quarts of oil in your truck, expecting that the quality of the oil can make up for the quantity …. It cannot….. no matter how good the film strength is “claimed” to be. The truth is, many two-stroke engines can “operate” on a 100:1 pre-mix so long as rpms are kept very low (as might be the case on a novice class open bike). But the first time that 100:1 engine makes an extended higher rpm run … it will lose the mathematics of oil migration, and score a piston. There is just no way around the math.
always mixture oil to the engine builders /manufacturers recommendation, not the oil manufacturers claim
always mixture oil to the engine builders /manufacturers recommendation, not the oil manufacturers claim
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28,075 Posts
Tl/dr
But the answer is DEPENDS!
@Bf services
@Mike N
Scag
@prezek
Fischer Minute Man
@cwren2472
Cummings
@H3LZSN1P3R
But the answer is DEPENDS!
@Bf services
@Mike N
Scag
@prezek
Fischer Minute Man
@cwren2472
Cummings
@H3LZSN1P3R
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3,840 Posts
I just checked the mix jug in your garage. Needs a pinch more salt and a dash of paprika.
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