All are benefits of valve canting EXCEPT ____.

The lack of control over turbulence.

All these statements about Hemispherical style combustion chambers are true EXCEPT ____.

Chamber design promotes squish and quench.

Which formula is used to find the Lift to diameter ratio or L/D ratio ?

L/D ratio = Valve diameter × 0.300"

What is turbulence and swirl ?

Rapid movement of gases promoting thorough mixing and a decreased burn time

What is valve shrouding ?

Larger valves sitting too close to combustion chamber walls.

All these statements about wedge style combustion chambers are true EXCEPT ____.

A poor choice for performance due to limited chamber sizes.

Which formula is incorrect ?

CID = Bore × Bore × Stroke × .7854 × # of valves

The Quick Iterator tool can be used to ____.

Perform a test series to find optimum horsepower or torque

If you improve air flow by 1 CFM at 28” of water, the engine will gain ____.

0.26 horsepower more per cylinder

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AT12150 Chapter 4 & 5 Review

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A review of chapter four and five. Made by Mr. Lozano. #UTI12150

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Questions 20

Answers

1
Surging motors and other testing errors can be caused by ____.
Incorrect settings
All the above.
Motor controller malfunction
Line voltage varying
2
All are benefits of valve canting EXCEPT ____.
Valves open toward the center of the cylinder bore.
The lack of control over turbulence.
More compact combustion chamber.
Makes the chamber more knock-resistant.
3
All these statements about Hemispherical style combustion chambers are true EXCEPT ____.
The valves are on opposite sides of the combustion chamber.
Combustion design allows for larger valves.
A plug at the top center allows for thorough combustion.
Chamber design promotes squish and quench.
4
What are the benefits of performance engine coatings ?
All the above.
Increased durability.
Increased corosion resistance.
Protection against heat.
5
To perform a flow bench automated test you must ____.
Find maximum valve lift by using a lift to diameter ratio
Slowly open the flow valve to see if the desired vacuum can be reached
All the above.
Set the flow orifices to the highest flow range.
6
DeskTop Dyno software allows you to ____.
Evaluate custom cylinder heads, cam timing and bore and stroke.
Simulate engine dynamometer (dyno) testing on a computer.
All of the above.
Perform test series to find optimum horsepower or torque.
7
What is the saturation point ?
When the port itself becomes the restriction.
When the valve curtain area becomes larger than the port area.
All of the above.
When the cylinder head does not show a marked improvement in air flow.
8
Lock-wire head gaskets provides the best sealing for extreme performance applications.
False
True
9
Which formula is used to find the Lift to diameter ratio or L/D ratio ?
L/D ratio = Valve diameter × 1.00"
L/D ratio = Valve diameter × 0.100"
L/D ratio = Valve diameter × 0.030"
L/D ratio = Valve diameter × 0.300"
10
We use ____ to measure cylinder head horsepower potential.
Engine Analyzer software.
FlowCom software.
Desktop Dyno software.
CamPro Plus software.
11
Square-cut and bead-lock style valve locks can be interchanged.
True
False
12
To avoid errors during flow bench testing you must ____.
Level and zero test meters before each test.
All of the above.
Minimize leakage to ensure good seals on all surfaces.
Use the same orifice range and testing points.
13
What is turbulence and swirl ?
The squishing of mixture gases.
The piston ring rotation during the 4-stroke process.
Port polishing a set of performance cylinder heads.
Rapid movement of gases promoting thorough mixing and a decreased burn time
14
Valve spring retainers can come in rotating, clenching and semi-clenching designs.
False
True
15
What is valve shrouding ?
Larger valves sitting too close to combustion chamber walls.
The angle in which the valves are cut.
Small valves with to much combustion chamber wall clearance.
The the chamber clearance to the piston crown.
16
All these statements about wedge style combustion chambers are true EXCEPT ____.
The design promotes better quench or squish area.
A poor choice for performance due to limited chamber sizes.
The chamber is shaped like a triangle or wedge.
The intake and exhaust valves sit parallel to each other.
17
Which formula is incorrect ?
Average Piston Speed = (Stroke × RPM) / 6
L/D Ratio = Valve diameter × 0.300"
CID = Bore × Bore × Stroke × .7854 × # of valves
HP = Torque × RPM ÷ 5252
18
The ceramic coating on top the piston is for ?
Reducing friction.
Reducing corrosion.
A thermal barrier.
Increasing compression.
19
The Quick Iterator tool can be used to ____.
All the above
Perform a test series to find optimum horsepower or torque
Calculate compression ratio
Input port flow data
20
If you improve air flow by 1 CFM at 28” of water, the engine will gain ____.
0.21 horsepower more per cylinder
0.26 horsepower more per cylinder
0.27 horsepower more per cylinder
0.43 horsepower more per cylinder

AT12150 Chapter 4 & 5 Review Flashcards | StudBud