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Four cycle engines have oil in the crankcase, and don't mix gas and oil. Two cycle engines have no oil in the base, and rely on oil mixed with the gas to lubricate the engine. If a two cycle engine has too much oil, it will foul the spark plugs. If it doesn't have enough oil, it will be severely damaged by friction. Some engines require a 25:1 mix, others a 50:1 mix and others 100:1 mix. |
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Note: There are 1000 millilitres (mL) in a litre (L).
1. At a ratio of 50:1, how much oil should be used for five litres of gas? Answer
2. At a ratio of 25:1, how much gas should be added if you had 150 mL or 0.150 litres of oil? Answer
1. At a ratio of 50:1, how much oil should be used for five litres of gas?
50:1 means 50 parts gas to 1 part oil
Mathematically we can solve the question like this:
| Method 1: Equivalent Ratios | Method 2: Cross Multiplication |
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This means that we need 0.1 litres (100 mL) of oil.
2. At a ratio of 25:1, how much gas should be added if you had 150 mL or 0.150 litres of oil?
25:1 means 25 parts gas to 1 part oil
Mathematically we can solve the question like this:
| Method 1: Equivalent Ratios | Method 2: Cross Multiplication |
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This means that we need 3.75 litres of gas.
Complete a chart with the above values and hang it on the shop wall for future reference.
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April 12, 2006 1:10 PM
