Our customer support team is available 7 days a week to help you. “In forced induction (FI) applications, erring on the low side is much safer than pushing your luck on the high side. Where CR is the compression ratio This should be the inner diameter of the cylinder, not the outer diameter. Enter the piston stroke length. Your headquarters for the hottest new products! Subtotal - $0.00. “The only exception is the change in deck clearance due to rod stretch, particularly with aluminum rods, and component deflection such as crank flex.". Our famous Summit Racing catalog and specialty catalogs too! Starting with a .060 over bore (4.130-inch) and 4.250-inch stroke, the swept volume of each cylinder is 62.006ci, which equates to a 496ci V8. Otherwise, different pistons will have to be ordered, or the cylinder head will have to be surfaced milled to reduce the combustion chamber volume and boost the CR. Get your engine's optimal compression ratio and total displacement in no time flat! When ordering pistons, for example, the company’s tech reps will need to know a number of factors to ensure the desired, or at least a safe, compression ratio can be provided. Gasket Thickness (in.) All of the factors must be in the same numeric value. Get out your 100ml burette, your Compression Ratio Calculator This compression ratio calculator can be used to work out the compression ratio of your engine. A number of sanctioning bodies restrict the engine’s compression ratio, depending on the class or application. The vavle chamfers on a cylinder bore of block, etc. Ring land volume. A high-CR engine will lose some of that compression pressure if the intake valve remains open t after the piston starts the compression stroke. Enter the cylinder bore diameter. Even with a new cylinder block, new rods and new pistons, there can be a significant difference with adding up the deck height and trying to subtract half the stroke, rod length and compression height. “Nothing is ever 100 percent, of course, which is why careful measurements are standard practice for machine shops and engine builders. Learn more. If the engine had a new block with a standard 9.800-inch deck height, the CR would drop to 9.86:1 because there would be .020-inch deck clearance. That’s just what our Speedmaster™ guideplate sets do, they are made from 5140 Chromoly steel, nitrided and black oxide coated for corrosion and wear resistance. For the best experience on our site, be sure to turn on Javascript in your browser. Piston manufacturers will provide the dome/dish volume in + or – CCs, and cylinder head companies offer their products with different volumes to help achieve the desired compression ratio. Your engine's static compression ratio is easily calculated if you know six measurements or volumes: If

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