As speed increases in an engine with throttle body fuel injection, does the temp

Question

As speed increases in an engine with throttle body fuel injection, does the temperature of the air-fuel mixture at the intake manifold exit increase or decrease? Explain what parameters affect your answer. A small five-cylinder Cl automobile engine when at operation speed is at 3500 rpm; the intake valve opens 32degreebTDC and closes 57degreeaBDC. The exhaust valve opens 52degreebBTX and closet 21degreeaTDC. When the engine is idling at 400 rpm the intake valve opens 12degreebTDC and closes 21degreea aBDC The exhaust valve opens 21degreebBDC and closes 8degreeaTDC. Calculate: Valve overlap in crank case degrees for operational speed and for idle speed. Valve overlap in real time for operational speed and for idle speed

Explanation / Answer

1)     The temperature of the air fuel mixture at the intake manifold decrease .

            Rate of throttle body fuel injection affect the answer .

2)   a)    valve overlap for operational speed = 3500 * 32/57   = 1964.91

             valve overlap for idle speed = 3500 * 52/21 = 8666.67

      b)     valve overlap for operational speed = 400 * 12/18 = 266.67

             valve overlap for idle speed = 400 * 21/8 = 1050

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