Automotive Technology: Principles, Diagnosis, and Service (5th Edition)
5th Edition
ISBN: 9780133994612
Author: James D. Halderman
Publisher: PEARSON
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Textbook Question
Chapter 30, Problem 1RQ
What is meant by the term crossflow head?
Expert Solution & Answer
To determine
Define crossflow head.
Explanation of Solution
Crossflow head:
The placement of valve in the cylinder head plays an important role in determining the breathing efficiency. When the intake and exhaust valves are placed opposite to each other in a combustion chamber, an easy way is created from the intake port to exhaust port through the combustion chamber and is referred to as crossflow head design.
In crossflow head design, the flow enters and leaves the combustion chamber in opposite directions in the cylinder head.
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Students have asked these similar questions
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6/86 The connecting rod AB of a certain internal-combustion engine weighs 1.2 lb with mass center at G
and has a radius of gyration about G of 1.12 in. The piston and piston pin A together weigh 1.80 lb. The
engine is running at a constant speed of 3000 rev/min, so that the angular velocity of the crank is
3000(2)/60 = 100л rad/sec. Neglect the weights of the components and the force exerted by the gas in
the cylinder compared with the dynamic forces generated and calculate the magnitude of the force on the
piston pin A for the crank angle 0 = 90°. (Suggestion: Use the alternative moment relation, Eq. 6/3, with B
as the moment center.)
Answer
A = 347 lb
3"
1.3"
B
1.7"
PROBLEM 6/86
6/85 In a study of head injury against the instrument panel of a car during sudden or crash stops where
lap belts without shoulder straps or airbags are used, the segmented human model shown in the figure is
analyzed. The hip joint O is assumed to remain fixed relative to the car, and the torso above the hip is
treated as a rigid body of mass m freely pivoted at O. The center of mass of the torso is at G with the initial
position of OG taken as vertical. The radius of gyration of the torso about O is ko. If the car is brought to a
sudden stop with a constant deceleration a, determine the speed v relative to the car with which the
model's head strikes the instrument panel. Substitute the values m = 50 kg, 7 = 450 mm, r = 800 mm, ko
= 550 mm, 0 = 45°, and a = 10g and compute v.
Answer
v = 11.73 m/s
PROBLEM 6/85
Chapter 30 Solutions
Automotive Technology: Principles, Diagnosis, and Service (5th Edition)
Ch. 30 - What is meant by the term crossflow head?Ch. 30 - Prob. 2RQCh. 30 - What is the recommended cylinder head...Ch. 30 - What are the advantages of using four valves per...Ch. 30 - Cylinder heads with four valves flow more air than...Ch. 30 - Two technicians are discussing a Hemi engine....Ch. 30 - Technician A says that an Audi five-valve engine...Ch. 30 - The gasket surface of a cylinder head, as measured...Ch. 30 - A warped aluminum cylinder head can be restored to...Ch. 30 - Some vehicle manufacturers recommend repairing...
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