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Originally Posted by leathermang
If the volume of the moving part of the cylinder is 3 liters divided by 5... and the compression ratio is 21.5 you can figure out the volume of the combustion chamber from that... then look at the difference on the end of the glowplug compared to the end of the compression tester... tiny difference overall...
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The concern had nothing to do with the compression tester that uses the glow plugs. The original question concerned the use of a compression tester using the injector ports. My concern was whether the tester took up a similar volume of space that the injector takes up. Apparently, as judging by the photos, it does. So, the error would be minimal.