1) Consider a standard piston engine. Draw a free body diagram of the piston. Th
1) Consider a standard piston engine. Draw a free body diagram of the piston. Then:
a. For an A SI engine with a 87 mm bore at an instantaneous cylinder pressure of
40 bar
i. Calculate the level of the combustion gas loading force on the wrist pin
b. Repeat this calculation for a forced-induction Diesel engine with a 145 mm bore
at a cylinder pressure of 108 bar.
2) Why is an intake valve always larger than an exhaust valve? Use specifics. What is the
better layout for engine operation: side valve or overhead valve, and why? Only
considering manufacturing costs, what valve layout would you choose to make: side
valve or overhead valve?
3) Calculate the mean piston speed (in m/s) for a Formula 1 engine running at 18,000 rpm
with a bore of 75 mm and a stroke of 40 mm. Calculate the average acceleration
imparted on the piston as it moves from TDC to 90ยบ ATDC.
4)What is the C.A.F.E. target for 2025? List three possible improvements to the automobile engine to help meet this goal.
5)Calculate the total power (HP) required to go 75 mph in a
1995 Mazda RX-7 weighing 2685 lbs with a Cd of 0.31 and a frontal area of 19 ft2.
Consider the coefficient of rolling resistance to be 0.015. What is the increase in
power required to go the same speed if the weight is increased by 915 pounds
(the max rated carrying capacity of the vehicle). If the rated power for the vehicle
is 274 bhp, will the car be able to reach 75 mph at full carrying capacity?
I have attached the pdf file of the assignment for refrence. Need in depth answers
6) Calculate the compression ratio of an engine with a stroke of 4.0 inches, a bore of
4.25 inches and a clearance volume of 5.65 cubic inches. Discuss whether or not
this is a realistic compression ratio for a street engine and what type of fuel it
would need to run correctly.
