Question

Look at the engine specifications listed below. 

  4-cylinder in line
  Displacement = 2.5 liters
  DOHC 16 valve
  140 bhp/7500 rpm
  190 foot-lbs/6000 rpm
  EFI fuel system
  Compression ratio 8:1

Technician A says the engine described uses a fuel mixture of eight parts air to one part fuel. Technician B says the engine described in the figure contains four valves per cylinder. Which one of the following statements is correct? 


 A. Neither Technician A nor Technician B is correct.   B. Both Technician A and Technician B are correct.   C. Only Technician A is correct.   D. Only Technician B is correct.

Answer 1

Both Technician A and Technician B are correct. The answer is letter B. Technician A's statement "engine described uses a fuel mixture of eight parts air to one part fuel" is correct because it shows the relationship between air and the fuel ratio. A compression ratio is the ratio of the cylinder volume and the combustion chamber volume when the piston is at the bottom and the combustion chamber volume when it is at the top. Technician B is also correct because for a DOHC cam (double overhead cam) means that there are two valves present at the entrance and exit of gases.