The cross-plane V8 is one of the greatest engine configurations of all time thanks to its balance, compact dimensions and big power potential. Jason Fenske at Engineering Explained reveals the simple beauty of this motor with a 3D-printed Chevy LS3 , demonstrating exactly what goes on inside this traditional but still very relevant engine.
It's a great watch, even if you've rebuilt hundreds of small-block Chevys. A V8 like this with a cross-plane firing order has one cylinder firing for every 90 degrees of crankshaft rotation, which means two cylinders are on the power stroke at any given time. As Fenske explains, this contributes to the smooth power delivery V8s are known for. This is why vehicle motors are referred to as internal combustion.
Most cars are powered by a 4 or 6 cylinder engine, while most trucks have a 6 or 8 cylinder. The more cylinders in an engine, the more combustion that occurs, creating more movement to turn the crankshaft and power to move the car. However, more cylinders also require more gasoline to make the combustion necessary to drive the car and thus are not as efficient.
This means that when you buy a 4 cylinder car, you are sacrificing power in order to increase efficiency. The 4 cylinder engine has to work harder to move the vehicle, hence why performance suffers. Manufacturers such as GM have recognized this and are working to make 4 cylinder engines more enjoyable to drive.
The pistons inside of the cylinders in your vehicle are arguably the most important part of a car and they are also subjected to a lot of heat and stress. If a cylinder is ever malfunctioning or not operating properly, it can cause significant damage to your engine and drastically affect the performance of your vehicle. GM has been working to combine the efficiency of a 4 cylinder engine with the performance of a V6 so that buyers no longer have to compromise.
The Chevrolet Trax , for example, comes with an optional 1. The metal forming the piston is certainly much thicker and stronger than a soup can. It's only that the can is a reasonably good comparison for the size and shape of the piston. Once again, the piston itself doesn't do this job alone. The force that sends the piston downward to turn the crankshaft must come from somewhere. It comes in the form of an ignition and explosion of a fuel and air mixture above the piston in what's called the combustion chamber.
Other key parts that make all this happen include the valves and the spark plug. The spark plug is there to provide the spark that causes the ignition and the explosion. The engine block is a critical part of the V-8 engine. It is the main structure around which, and into which, all the other essential engine parts are built. One of the critical engine parts is the engine cylinder. The V-8 engine cylinders are hollowed out, cylindrical formations within the engine block. They're arranged in two sets of four in a V formation within the engine block.
Their function is to accommodate the piston and allow a tight-fitting space for the piston to move up-and-down while forming a seal.
In the video, we see the larger valve in the intake and the smaller valve is for the exhaust. Since we're looking at a Chevrolet V-8 engine , there are pushrods present. The pushrods activate the rocker arms that open up the valves. The alternative is a chain-driven overhead cam design, which at GM you'll now find in Cadillac's latest V As for the pushrods, they work via the camshaft's lobes that activate the pushrods to open up the appropriate valve as it turns.
Now, the camshaft that operates the valves is connected to the crankshaft. For every two crankshaft rotations, the camshaft rotates once, and Jason removes the oil pan to show how the crankshaft operates. Weights are added to the crank to balance the engine and connecting rods connect the crank to the pistons. So, as the piston reaches the top of the cylinder, the counterbalance is directly across from it to balance out the force.
And at another 90 degrees, it counters out the other piston's force.
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