Measuring 2 stroke oil by weight

[Brian Dorricott 1]

Just a quick question what is the weight of 2 stroke oil ? I.e. what does a 100ml of oil weigh in grams ? I am hopeless mixing in a bottle im sure its not very accurate but use the weight method when baking with good results . Rather than trying to see through opaque plastic its much easier to read a digital scale with the container zeroed out and also what does unleaded weigh say 1 litre of petrol in grams . 

Thanks in advance .

[Dane Crosby]

One litre of standard unleaded weighs around 760 Grammes. 

[Brian Dorricott 1]

Thanks for that Dane thats a start just need the weight of 2 stroke oil now . 760 grams bit less than I expected I was thinking more like 850 shows what I know .

[Frank Skilbeck]

You need to find the specific gravity of the oil you are using, but the one I found was a .880, so 880 grams per litre, so 100 ml will weigh 88 grams, of that oil. 

 

If you want to be super accurate you need to find out (or measure) the sg of the oil you are using

[Ace]

I use one of these plastic measuring tubes - super easy to be accurate (showing 40ml/cc example)

 

[Brian Cooper]

Measuring the oil content by weight is going to be "iffy" at best. 

Just go to a chemist shop and buy a big syringe to measure it by volume . . Job done.

Edited April 13, 2021 by Brian Cooper

[Gary Manuel]

I use small disposable 250ml lemonade bottles from Asda (other supermarket brands / products may be equally suitable). I remove the paper label and wrap masking tape around them so that I can easily write on them.

 

As a one-off job, accurately measure the required quantity into one of the bottles, using syringes or whatever you fancy and mark the oil level on the outside of the bottle. I use a 30:1 mix, so I measured out 5000/30 = 167ml. Transfer the mark to the other identical bottles then fill the other bottles up to the mark. I get exactly 6 bottles worth out of my 1 litre supply bottle. I carry a full bottle or two with me when I go flying, allowing me to buy 5 litres of petrol on the way to the flying field and just pour the pre-measured bottle of oil in when I get there.

 

If you use different mixes for different engines, fill you bottles up to different lines and write on the bottle what fuel it is and what ratio it is. For example, my 167ml bottles say "Mobil 1 2T 30:1".