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PostPosted: Mon Apr 04, 2011 10:32 pm 
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Able Skipper
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Hi Guys and Girls,

The following link leads to a handy fuel mix chart.

http://www.manxyouthtrials.com/two-stroke.pdf

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PostPosted: Tue Apr 05, 2011 12:04 am 
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Admiral
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Wanton wrote:
Hi Guys and Girls,

The following link leads to a handy fuel mix chart.

http://www.manxyouthtrials.com/two-stroke.pdf


The maths is so simple, yet the consequences of a stuff up so bad, and the probability of a stuff up so small yet inevitable in the long run.

The trouble is that it's expressed as "50:1" when you're not interested in how much petrol to add to your oil, you want to know how much oil to put in your petrol.

But reading the table it finally dawned on me...


Victa lawnmower, 25:1 = 4%.
1 litre petrol; 4x10ml = 40ml of oil.

My old Chrysler outboard, 50:1 = 2%.
12 litre tank requires 2x120ml = 240ml of oil.

INMA's Mercury with magic synthetic oil at 75:1 = 1.33%
12 litre tank requires 1x120ml + 1/3 x 120ml = 160ml of oil.

Never again will I think of 25:1, its 4%!

My Honda 4 stroke outboard, 0% oil. Even easier.

Four strokes! For the mathematically challenged!
(And engineers who don't want to do maths on weekends)

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PostPosted: Tue Apr 05, 2011 9:42 am 
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Ed,
On "Moody Blue" I have a little tag (Laminated print) hanging on the fuel line, that shows how much oil to add.

When the tank is part empty and topped up I then know how much oil to add based on how much petrol was added.

I'll post the file later from home.

Jeff


Attachments:
fuel.xls [16 KiB]
Downloaded 225 times

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Last edited by MoodyBlue on Tue Apr 05, 2011 11:19 pm, edited 1 time in total.
Added "FUEL.XLS" file
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PostPosted: Tue Apr 05, 2011 10:43 am 
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This is my chart that stays with my oil bottle.

The oil bottle is a measuring type with a 1 liter holding tank and a 15mm measuring tank on top with two caps.

Two stroke mix
Ratio

Petrol, 25:1 40:1 50:1 75:1 100:1
1, 40 25 20 13 10
2, 80 50 40 27 20
3, 120 75 60 40 30
5, 200 125 100 67 50
10 400 250 200 133 100 OIL ml

Edit, I can't get the columns to line up.

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Last edited by INMA on Tue Apr 05, 2011 10:58 am, edited 5 times in total.

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PostPosted: Tue Apr 05, 2011 10:56 am 
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Able Skipper
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Here is a copy of the Chart showing only the metric converstion table for fuel mix. I have added the measurment for 75:1 mix as well.


Attachments:
File comment: This is a PDF file. You will need Adobe PDF reader to be able to view it.
Two Strok Fuel Chart.pdf [35.12 KiB]
Downloaded 565 times

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Ed
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Photo shows Wanton at Nara Inlet, Whitsundays, Qld.
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PostPosted: Tue Apr 05, 2011 8:49 pm 
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Thanks Wanton, much easier than having a brain aneurism every time you go to fill up the tank!! 8)

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PostPosted: Tue Apr 05, 2011 8:54 pm 
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Admiral
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INMA wrote:
This is my chart that stays with my oil bottle.

The oil bottle is a measuring type with a 1 liter holding tank and a 15mm measuring tank on top with two caps.

Two stroke mix
Ratio

Petrol, 25:1 40:1 50:1 75:1 100:1
1, 40 25 20 13 10
2, 80 50 40 27 20
3, 120 75 60 40 30
5, 200 125 100 67 50
10 400 250 200 133 100 OIL ml

Edit, I can't get the columns to line up.


You never mentioned this when you got me to mix you some two stroke fuel off Sandringham at Xmas!

Rotten sod made me do maths on a boat!

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PostPosted: Tue Apr 05, 2011 10:34 pm 
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Zeb, its written on the side of the oil bottle now.

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PostPosted: Fri Apr 08, 2011 6:49 am 
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Hi Guys

This is a good online mixing tool ... http://www.csgnetwork.com/oilfuelcalc.html

The bottom one is liters

Cheers
Byrds

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