🔍 Key Concepts

• Air density and oxygen content in relation to temperature • How diesel combustion depends on the mass of air (oxygen) in each cylinder charge • Relationship between available oxygen and maximum fuel that can be burned (and thus power)

💭 Think About

• When intake air is heated, what happens to its density and the amount of oxygen entering the cylinder per intake stroke? • If there is less oxygen available in the cylinder, what must happen to the amount of fuel that can be efficiently burned? • How would changes in the amount of fuel that can be burned per cycle affect the maximum horsepower output of the engine?

✅ Before You Answer

• Verify how increasing air temperature affects air density (more or less air mass per unit volume). • Consider whether a diesel needs cooler, denser air or hotter, thinner air to produce more power. • Check which option is most consistent with a situation where there is less oxygen per intake stroke for complete combustion.