When the mixture explodes inside of the cylinder, it will push the piston back down. Compressing a fuel and air mixture to a certain point, and then setting it on fire. As in any combustion engine, the power of the engine is made when a piston moves upward in a cylinder. It will prove whether the engine has a good powerhead or not. It is the very basic test that can provide the tester with the viability of the engine itself. How to do them and what the results mean for you! What Is A Compression Test?Ī compression test for an outboard is a simple test that can be performed on any combustion engine. Here is everything that you need to know about outboard compression tests. Good results for Four-Strokes should be 180-210 PSI, and Two-Strokes should be around 110-130 PSI. Results vary depending on whether the outboard is a Four-Stroke or a Two-Stroke. What Outboard Compression Test Results Mean. The first thing that most people think of when they hear the words, “compression test,” is expensive.
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