Engines

Question 1

What is the best fuel:air mixture ratio

Answer 1

1: 15 chemically correct
1: 14 is best power mixture

Question 2

Leaning fuel has the following 4 benefits

Answer 2

Save fuel
Increase engine efficiency
Decrease spark plug fowling
Keeps combustion chamber clean while decreasing pre-ignition

Question 3

Too lean mix can cause (4):

Answer 3

Rough engine
Backfiring
Overheating
Sudden engine stoppage

Question 4

Too rich mixture can (5):

Answer 4

Fuel wastage

Spark plug fouling

Combustion chamber deposits

Rough engine run

Loss of power or engine failure

Question 5

Fuel : Air mixture is by a) weight, or b) volume?

Answer 5

A) Weight