What does the big end of a connecting rod hook to?
Table of Contents
What does the big end of a connecting rod hook to?
crankpin journal
The big end of the connecting rod connects to the crankpin journal to provide a pivot point on the crankshaft. Connecting rods are produces as one piece or two-piece components.
What is the advantage of longer connecting rods?
Many racing engines use longer connecting rods to help reduce piston weight while having positive effects on torque curve shape and positioning and combustion efficiency. Longer rods typically require shorter, lighter pistons. This pushes the ring pack higher on the piston.
Why does a connecting rod break?
Fatigue. Fatigue is the main cause of broken connecting rods–especially in older engines. The constant compression during the power stroke and stretching during the exhaust stroke, over thousands of times a minute, eventually wears the metal out and it becomes brittle and finally breaks.
Can I use shorter connecting rods?
A short connecting rod unquestionably increases the lateral thrust forces of the piston on the cylinder and, consequently, friction and wear.
How does connecting rod length affect performance?
The longer the con rod, the lower its angle to the cylinder axis for any angle of crankshaft rotation. The higher the r/l ratio, the greater the angle of the rod when maximum cylinder pressure occurs. The effect of higher rod angularity is to increase the side load on the piston skirt.
What is the weight of connecting rod base?
0.439 kg
Design and Analysis of Connecting Rod for Weight and Stress Reduction
| Crankshaft radius | 48.5 mm |
|---|---|
| Connecting rod length | 141.014 mm |
| Piston diameter | 86 mm |
| Mass of the piston assembly | 0.434 kg |
| Mass of the connecting rod | 0.439 kg |
Which steel is suitable for connecting rod?
A connecting rod with a tension load is made of forged steel, cast steel, or fabricated steel. Rods with a compression loading are cast nodular steel or aluminum alloy.
Do connecting rods stretch?
All connecting rods stretch under high RPM use, and aluminum rods will tend to stretch . 010″ more than steel with all other variables being the same. This expansion that aluminum rods endure is attributed to the inherent thermal expansion of aluminum as a material more so than high RPM movement.
What causes a big end to go?
Big End engine problem – FLOGGED / SEIZED / PICKED UP The most important factor in extended bearing life is the maintenance of good lubrication. Oil starvation is the most common cause of bearing pick-up or seizure. Running engines consistently at low oil levels will eventually cause severe bearing damage.