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Part 1

The following components​ (including bearings,​ rings, and wrist​ pin) are part of an​ I-4 engine. Their masses are shown here.  What will be the weight of each of the Large Connecting Rod Ends once they are​ balanced?

Cylinder​ #

Piston Assembly

Connecting Rod Small End

Connecting Rod​ (Large End​ - Including ​ bearing)

1

347

grams

130

grams

275

grams

2

341

grams

125

grams

271

grams

3

343

grams

131

grams

275

grams

4

352

grams

126

grams

279

grams

Question content area bottom

Part 1

Each large connecting rod​ end, when​ balanced, will weigh.enter your response here

grams.  

Formulas

When preparing for engine crankshaft​ balancing: weigh each piston​ assembly, keeping the smallest weight and machine the others to match. Weigh each small end connecting​ rod, keeping the smallest weight and maching the others to match. Weigh each large end connecting​ rod, keeping the smallest weight and machine the others to match.

Piston Assembly Weight​ = Piston​ + wristpin​ + rings

Rotating Weight​ = Large end of connecting rod​ + bearings

Reciprocating Weight​ = Small end of connecting rod​ + piston assembly

Bobweight​ = Rotating Weight​ + StartFraction left parenthesis Reciprocrating Weight right parenthesis Over 2 EndFraction

Torque​ = Force​ * Length of lever arm

Force​ = Torque​ / Length of lever arm

Length of lever arm​ = Torque​ / Force

Horsepower​ = StartFraction Torque star RPM Over 5252 EndFraction

BTDC​ = Before Top Dead Center

ATDC​ = After Top Dead Center

BBDC​ = Before Bottom Dead Center

ABDC​ = After Bottome Dead Center

Intake Duration​ = # of Degrees the crankshaft turns when the intake valve is open

Exhauset Duration​ = # of Degrees the crankshaft turns when the exhaust valve is open

Valve Overlap​ = # of Degrees the crankshaft turns when the intake and exhaust valves are both open

Intake Centerline​ = take the intake duration​ / 2 and then adjust for the start of the valve opening

asked by guest
on Dec 02, 2025 at 1:15 pm



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