Crankshafts and Engine Crankshaft Parts

What Are the Parts of Crankshaft?

The crankshaft is a critical component of an internal combustion engine, responsible for converting the linear motion of the pistons into rotational motion that drives the wheels. It consists of several essential parts, including:

1. **Main Journals:** These are cylindrical sections of the crankshaft that ride in the engine block's main bearings.

2. **Rod Journals:** Similar to main journals, rod journals are cylindrical sections that connect to the connecting rods.

3. **Crankpins:** These are the offset sections of the crankshaft that connect to the connecting rods. Crankpins provide the leverage needed to turn the crankshaft.

4. **Counterweights:** Counterweights are strategically placed on the crankshaft to balance the reciprocating motion of the pistons and rods, reducing vibrations and ensuring smooth operation.

5. **Flange:** The flange is the end section of the crankshaft where the flywheel or flexplate attaches.

What Component Is Connected to the Crankshaft?

The primary component connected to the crankshaft is the connecting rod. Each piston in the engine is attached to a connecting rod, and the other end of the connecting rod is connected to the crankshaft's crankpin. This connection allows the reciprocating motion of the pistons to be transmitted to the crankshaft.

As the pistons move up and down within the engine cylinders, they push and pull on the connecting rods, which, in turn, rotate the crankshaft. This rotational motion is what powers the engine and ultimately propels the vehicle.

How Much Do Crankshafts Cost?

The cost of a crankshaft can vary widely depending on several factors, including the type of engine, the material used, the brand, and whether it's a stock or performance crankshaft. Here's a general price range:

1. **Stock Crankshafts:** Stock replacement crankshafts for common engines like the Chevy 350 can range from $100 to $500 or more, depending on the vehicle's make and model.

2. **Performance Crankshafts:** High-performance or forged steel crankshafts designed for racing or modified engines can cost anywhere from $500 to $1,500 or more.

3. **Custom Crankshafts:** For specialized applications or custom engine builds, custom-made crankshafts can cost several thousand dollars.