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Old 06 August 2015, 17:05   #1
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Petrol mixing bottle

Just bought a 14 ltr petrol tank for my rib what size mixer bottle do i need?
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Old 06 August 2015, 17:23   #2
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As in to measure 2 stroke oil in before pouring into the fuel tank?
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Old 06 August 2015, 17:26   #3
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Yes jim
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Old 06 August 2015, 17:49   #4
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Phil that depends on your mix. I'd assume you are on 50:1 but if the engine is really old it could be 25:1 and a few run on 100:1.

If you put 10 litres of fuel in, you add 10000ml divided by 50 for 50:1. so 1000/5 or 200ml.
If you put 13 litres in it'll be 260ml, or 14 litres 280ml of oil. BUT if its really a 14litre tank is there room for 280ml extra... It may be easier to work backwards - use 250ml of oil which will be easy to find a suitable size bottle, and put 12.5litres in from the pump.

What I find much harder is when I have a ""half"" full tank already. You have no idea how much is in there. Lets say its got 7.7litres in it and you want to top it off to 14litres. You go to the pump and add 6.3 litres. You now get the calculator out and divide 6300 by 50 and now need to find something that will measure 126ml...? Often easier to work with a 5litre can like you'd use for your car. 5litres + 100ml oil. Usually enough space to squeeze it in. Mix it, slosh it into the tank. If no room you just store the remainder in the can. Next time you fill up slosh the remainder in the tank first so you have an empty can to begin with...
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Old 06 August 2015, 17:54   #5
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Cheers for that will have to do some calculations.
Many thanks
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Old 06 August 2015, 18:11   #6
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Oh and pick your plastic carefully - I put some unleaded in a plastic beaker (like you'd get at a beer festival) the other week. It instantly turned white and in 10 minutes had melted through the bottom (made a *** mess!) But I dread to imagine what plasticisers dissolved into the petrol...

Polyethylene would be good. Look for one with graduations engraved in rather than printed on.
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Old 06 August 2015, 18:58   #7
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I can't remember where I got it from but I had a graduated plastic lab beaker when I first had a boat (1980s). Held about 300ml and 50ml graduations.

Perhaps available from a good chandlery or a resin supplier?
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Old 07 August 2015, 02:32   #8
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Thanks for your help will probably go to local marine shop and purchase there rather than online.
Cheers.
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Old 07 August 2015, 04:34   #9
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Hi All

I use the one shot container does 5 ltr and buy a pack of 20 ml plastic shots from a shop.Keep to whole Ltrs and just half it for odd ltrs.Or medical syringes on ebay 100ml job done.
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Old 07 August 2015, 04:44   #10
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I use one of these:-

Plastic Measuring Cylinder Laboratory Test Graduated Trial Liquid Tube Jar Tool | eBay

Only put the oil in it not petrol, not melted yet!
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