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What Are Cubic Inches? The bore diameter area plus the area of the crank stroke multiplied by the number of cylinders equals the amount of volume your engine moves or displaces with every revolution. This volume is known as the engine's piston displacement.
The calculation for finding the displacement is relatively simple: pi 4 x bore2 x stroke. For example: As we mentioned above, the Chevy V-8 ci engine has a 4. We'll use that as our example. The first calculation, pi 4, never changes; it simply sets the equation for the geometric shape of a cylinder.
When divided by four, you get 3. The second calculation is to multiply the bore times itself. This gives the top and bottom diameter of the geometric shape. The bore is 4. The last portion is easy.
It's simply the geometric shape x bore x stroke x the number of cylinders: 0. Round the figure off and you have ci. A stroker has a 0. Putting the crank in the increases the stroke to 3. Other than that, all the other dimensions stay the same. If you do the math, you will get The phrase "There's no replacement for displacement" comes to mind as far as why it works so well. But if that doesn't curb your appetite for knowledge, then here it is in a little more detail.
Increasing the stroke changes some of the characteristics of the engine that render low rpm power. First is that the increased stroke has a larger leverage arm; this allows the fuel combustion to apply more pressure to the flywheel with the same amount of fuel. The Stroker is popular for people with the Chevy blocks who want a little more power.
Another reason for the popularity is that this range of Chevrolet engines are able to easily swap parts from one engine to another, making it easy to work on and customize the engine just how that enthusiast wants. Hot rod guys in particular love creating their very own engine, and this interchangeability helps to allow that. Since most of the Chevrolet Stroker engines are modified, the performance specifications would also likely vary considerably.
To make it simpler, I will just talk about the specifications of the Stroker that can be purchased as a crate engine from Chevy. The latest version of this crate engine is able to reach horsepower and lb-ft of torque. Chevy does recommend that this engine be paired with a Holley 4-barrell carburetor to ensure that the maximum performance specifications are reached.
Adding a longer stroke moves the piston over a greater distance, which also pulls the piston farther out of the bottom of the cylinder. If the piston guide point extends past BDC, the piston will rock, and the end of the cylinder sleeve becomes a very efficient lathe that will peel aluminum right off the piston skirt— destroying the pistons.
These are just some of the considerations that go into choosing a stroker engine package and why professional guidance is a great way to prevent small problems from becoming very expensive, bigger issues. Below are some of the most popular Chevy stroker combos and their subsequent bores and strokes. About Us Contact Us. K1 Technologies. The best way to minimize problems with a stroker upgrade is to purchase a complete rotating assembly with a crank, pistons, and rods.
One reason for large main journal diameters is to create an overlap between the main and rod journals as viewed down the centerline from the end. This overlap creates strength and reduces deflection under load. Increasing stroke reduces this overlap, which is why K1 Technologies stroker cranks are forged from high-grade steel.
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