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Hello:

A combustion engine uses a fuel mixture of gasoline to oil in a ratio of 50:1. How is the correct amount of gas and oil determined to use in the engine?

I thank you for your reply.

If the ratio is 50 to 1, that means for every 50 units of gasoline, there needs to be 1 unit of oil.

In other words, whatever units the oil is measured in, the engine needs 50 times as much gas.

Another way of doing it is putting in a bunch a gas and dividing the amount input by 50. That is, if it take 10 gallons of gas, divide 10 by 50 and get 1/5. That would mean it would need 1/5 gallon of oil (1/5 of a gallon is 4/5 of a quart).

Perhaps it would be better to say if it took 50 gallons of gas, it would take 1 gallon of oil. Since there are 4 quarts in a gallon, and oil is usually measured in quarts, it could also be said that if it takes 12.5 gallons of gas, it takes 1 quart of oil.

Actually, oil is most likely in pints, so for every pint of oil, there should be 50 pints of gasoline.

Since there are 8 pints in a gallon, that would be 50/8 gallons of gasoline. When the division is carried out, that works out to 6 1/4 gallons of gasoline. That is the same as 6.25 gallons of gasoline or 6 gallons and a quart more.

In summary, that is a ratio of 1 unit oil to 50 units of gasoline.

That can be translated into:

0.2 gallons of oil to 10 gallons of gas,

1 gallon of oil to 50 gallons of gas,

1 quart of oil to 6.25 gallons of gas (6 gallons of gas and a quart of gas), or

1 pint of oil to 3.125 gallons of gas (3 gallons of gas and a pint of gas).

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