Crankshaft, connecting rods and pistons…

In the last post we looked at the engine cylinder block and the stroke process. In this post we’ll look at the crankshaft, connecting rods and pistons. I’ve included all these parts together because they’re all connected to each other. Have a look at the diagram below.


In the diagram above we have three specific parts, we have the crankshaft, the connecting rods and the pistons. There are more parts, but I’m trying to keep this as simple as possible. Once we have the basics we can go more in to detail.

Crankshaft (you can ignore the red arrow for now)



Connecting rod

connecting rod



The crankshaft sits at the bottom. In the picture of the crankshaft above you’ll see a red arrow. The big end of the connecting rod connects to the crankshaft at this point. The small end of the connecting rod connects to the piston. The result of all these connections being the image below.


The crankshaft is attached to the bottom of the engine cylinder block and each of the connecting rod/piston assemblies are then placed in to the cylinders from the bottom.

It’s worth nothing on one end of the crankshaft there is a crankshaft belt pulley and on the other end is an attachment that connects the flywheel and the crankshaft together. We’ll talk about belts and flywheels later in the blog.

Once the piston is attached to the connecting rod, the connecting rod to the crankshaft and the crankshaft to the engine cylinder block, you get something that works like this.


Well that’s all for now folks. Be sure to like and share this and I’ll keep adding more.


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