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#1
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How critical is the oil/petrol ratio for a 2 stroke engine?
I have a McCulloch strimmer which takes a 40:1 petrol/oil mix.
However, my mixing bottle (which takes 1 litre of petrol and has a pointed top graduated in different radios) has become 'bloated' This means that when you fill it to the 1L mark, there is actually more than 1L in the bottle. If I then top it up to the 40:1 with oil, I am getting a slightly lean mix. So, to counteract this, I have been adding a few extra drops of oil, but the problem is that I don't know what ratio I am creating this way. I imagined that a slightly richer mix would be better than a lean one, so I have made sure that I mix is on the 'rich' side if anything. I figured that if it was too lean, then I stand the risk of seizing the engine and doing real damage. But it is too rich, I would just have too much oil, resulting in more smoke from the exhaust. However, I asked my local lawnmower maintainer about this and was told that it should be spot on 40:1.. To much or too little oil is just as bad for the engine. Is this really true? Is it a real problem running a 2-Stroke engine with too much oil? Even if too much oil is not ideal, is it so bad that you should throw away a mix, if you added too much oil by accident? Can anyone shed any light on this? |
#2
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How critical is the oil/petrol ratio for a 2 stroke engine?
"Jon Weaver" wrote in message om... I have a McCulloch strimmer which takes a 40:1 petrol/oil mix. However, my mixing bottle (which takes 1 litre of petrol and has a pointed top graduated in different radios) has become 'bloated' This means that when you fill it to the 1L mark, there is actually more than 1L in the bottle. If I then top it up to the 40:1 with oil, I am getting a slightly lean mix. So, to counteract this, I have been adding a few extra drops of oil, but the problem is that I don't know what ratio I am creating this way. I imagined that a slightly richer mix would be better than a lean one, so I have made sure that I mix is on the 'rich' side if anything. I figured that if it was too lean, then I stand the risk of seizing the engine and doing real damage. But it is too rich, I would just have too much oil, resulting in more smoke from the exhaust. However, I asked my local lawnmower maintainer about this and was told that it should be spot on 40:1.. To much or too little oil is just as bad for the engine. Is this really true? Is it a real problem running a 2-Stroke engine with too much oil? dont worry |
#3
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How critical is the oil/petrol ratio for a 2 stroke engine?
"pied piper" wrote in message ... "Jon Weaver" wrote in message om... I have a McCulloch strimmer which takes a 40:1 petrol/oil mix. However, my mixing bottle (which takes 1 litre of petrol and has a pointed top graduated in different radios) has become 'bloated' This means that when you fill it to the 1L mark, there is actually more than 1L in the bottle. If I then top it up to the 40:1 with oil, I am getting a slightly lean mix. So, to counteract this, I have been adding a few extra drops of oil, but the problem is that I don't know what ratio I am creating this way. I imagined that a slightly richer mix would be better than a lean one, so I have made sure that I mix is on the 'rich' side if anything. I figured that if it was too lean, then I stand the risk of seizing the engine and doing real damage. But it is too rich, I would just have too much oil, resulting in more smoke from the exhaust. However, I asked my local lawnmower maintainer about this and was told that it should be spot on 40:1.. To much or too little oil is just as bad for the engine. Is this really true? Is it a real problem running a 2-Stroke engine with too much oil? dont worry If you use stihl own oil then they recommend half the amount than other oil. I queried this and was told that extra oil does little or no harm, just oils the plugs a bit, whereas too little oil can be very detrimental. Cheers John T -- Remove the wet from towill to reply by email |
#4
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How critical is the oil/petrol ratio for a 2 stroke engine?
In article , Jon Weaver writes I have a McCulloch strimmer which takes a 40:1 petrol/oil mix. However, my mixing bottle (which takes 1 litre of petrol and has a pointed top graduated in different radios) has become 'bloated' This means that when you fill it to the 1L mark, there is actually more than 1L in the bottle. If I then top it up to the 40:1 with oil, I am getting a slightly lean mix. But only slightly. So, to counteract this, I have been adding a few extra drops of oil, but the problem is that I don't know what ratio I am creating this way. Doesn't matter, IMO. I imagined that a slightly richer mix would be better than a lean one, so I have made sure that I mix is on the 'rich' side if anything. I figured that if it was too lean, then I stand the risk of seizing the engine and doing real damage. But it is too rich, I would just have too much oil, resulting in more smoke from the exhaust. And an oiled up plug if there is really too much oil. However, I asked my local lawnmower maintainer about this and was told that it should be spot on 40:1.. To much or too little oil is just as bad for the engine. Certainly too much or too little is bad, but there's no 2-stroke engine made which will suffer if you use 39:1 or 41:1, or even 35:1 or 45:1. The ratio is not *that* critical. The instructions for my Flymo strimmer say to use the correct ratio but they don't make a song and dance about it having to be exact. Is this really true? Is it a real problem running a 2-Stroke engine with too much oil? It will smoke a bit more and the plug may get oiled up. Even if too much oil is not ideal, is it so bad that you should throw away a mix, if you added too much oil by accident? Tip some out and add some more petrol. -- Malcolm |
#5
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How critical is the oil/petrol ratio for a 2 stroke engine?
"Jon Weaver" wrote in message om... I have a McCulloch strimmer which takes a 40:1 petrol/oil mix. However, I asked my local lawnmower maintainer about this and was told that it should be spot on 40:1.. To much or too little oil is just as bad for the engine. Is this really true? iirc this is what McCulloch dealers are told to say. Too much oil isn't a big deal - too little could be. Quality of oil is important. Engine maker's oil (any maker) is usually OK at 40 or 50:1. Cheap no name - oil follow the instruction on the can often 25:1 and smelly ;~((( Rod |
#6
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How critical is the oil/petrol ratio for a 2 stroke engine?
g'day john,
all you need do is get it as close as you can to the recommended ratio, as stated too little is going to be the worst, too much will fowl spark plugs and lead to the clogging up of the muffler. plus your machine will blow more smoke and could be down a little on power depending on how much the oil ratio is above that of the fuel. len snipped -- happy gardening 'it works for me it could work for you,' "in the end ya' gotta do what ya' gotta do" but consider others and the environment http://hub.dataline.net.au/~gardnlen/ |
#7
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How critical is the oil/petrol ratio for a 2 stroke engine?
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#9
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How critical is the oil/petrol ratio for a 2 stroke engine?
"Jon Weaver" wrote in message om... I have a McCulloch strimmer which takes a 40:1 petrol/oil mix. However, my mixing bottle (which takes 1 litre of petrol and has a pointed top graduated in different radios) has become 'bloated' This means that when you fill it to the 1L mark, there is actually more than 1L in the bottle. Can anyone shed any light on this? I used to ride a Lambretta two-stroke scooter and frequently took liberties with the petrol/oil mixture, persuading myself that it went faster with less oil in the mixture. I didn't blow it up and changed plugs no more frequently than my more cautious fellow riders. Therefore I would say that a little bit (say 20% error) in either direction is not going to make any appreciable difference. If you are still bothered, treat yourself to a metal measuring jug. -- Brian "I know about kittens and knitting. Will that do?" |
#10
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