Why does a gdi system allow for great thermal efficiencies

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Reference no: EM133724040

Assignment: Calculating Percentage Increase in Flow Area

A. Two possible OHV combustion chambers are being considered. The first has two valves, and the second has four valves per cylinder. The diameter of the inlet valve is 25 mm for the first design and 15.5 mm for the second. If the second design is adopted, calculate the percentage that the total valve perimeter is increased by. If the valve lift is the same between the two designs, calculate the percentage increase in flow area.

B. Why does a GDI system allow for great thermal efficiencies as it relates to compression ratios?

C. What is the "rule of thumb" recommendation for valve lift for a 40 mm diameter valve?

D. For tuning an intake runner, would a designer choose a long or short intake runner to maximize engine torque at a high rpm?

E. What is a typical pressure for the fuel feeding a port fuel injector, in psi?

F. How do carburetors vaporize fuel so it is mixed with the intake air? Name the device and its effect on the air and fuel

G. Calculate the Inlet Mach Index for inlet flow for an 8 cylinder engine with a 105 mm bore, a 40 mm inlet valve size, a 2 valve head, and is 80% oversquare. Assume the discharge coefficient of the port is 0.53 and that the engine is operating at 5,000 rpm with an intake temperature of 20ºC. Is this a reasonable value for Mach Index?

H. If an engineer is tasked with making an injector for a GDI vehicle, what design considerations must be accounted for that are not present with a port injection system?

I. What is the primary purpose of a flywheel?

J. What are the three methods used to direct the fuel spray in a GDI engine?

Reference no: EM133724040

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