Add up your measurements and divide by however many you took (usually three or four is plenty) to get the average diameter. Insert the gauge into the cylinder and measure the bore multiple times in different places within the cylinder and write down the measurements. First determine the approximate diameter of the cylinder and calibrate your dial bore gauge with a micrometer. A dial bore gauge is used to measure the diameter of a hole, or in this case, a cylinder. Step 1: Clean the engine Thoroughly clean the engine cylinders and pistons with degreaser and a clean rag. Ruler or tape measure (must be very accurate down to the millimeter).Degreaser and clean rags (if necessary).If you have an engine that is assembled, scroll down and use Method 2 of 2. It would be very time consuming to take apart an engine to use this method. This method is ideal for someone who is either building an engine and has the tools on hand, or those who have an engine that is already taken apart. This method requires very precise measurements, so it’s important to have very accurate tools, a clean engine, and to double- or triple-check your work. Method 1 of 2: Measure the compression ratio manually The first is the manual version which requires you to do all the math as accurately as you can, and the second - and probably the most common - requires a pressure gauge fitted into an empty spark plug socket. There are two methods you can use to calculate an engine’s compression ratio. The more tightly this mixture fits, the better it burns and the more energy is converted into power for the engine. Put more simply, the compression ratio is the measurement of compressed gas to uncompressed gas, or how tightly the air/gas mixture fits within the combustion chamber before it’s ignited by the spark plug. They may seem complicated at first, but they’re really just basic geometry.Īn engine’s compression ratio measures two things: the ratio of the volume of gas in the cylinder when the piston is at the top of the stroke (top dead center, or TDC), compared to the volume of gas when the piston is at the bottom of the stroke (bottom dead center, or BDC). There are a few equations needed to calculate the compression ratio if you’re doing it manually. Whether you’re building a new engine and you need the metric, or you’re curious to know how efficient your car uses fuel, you have to be able to calculate the engine’s compression ratio.
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