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  2. Leak-down tester - Wikipedia

    en.wikipedia.org/wiki/Leak-down_tester

    A compression tester. Leak-down testing is a static test. Leak-down tests cylinder leakage paths. Leak-down primarily tests pistons and rings, seated valve sealing, and the head gasket. Leak-down will not show valve timing and movement problems, or piston movement related sealing problems. Any test should include both compression and leak-down.

  3. Compression ratio - Wikipedia

    en.wikipedia.org/wiki/Compression_ratio

    In piston engines, static compression ratio is determined using the cylinder volume when the piston is at the top and bottom of its travel. The compression ratio is the ratio between the maximum and minimum volume during the compression stage of the power cycle in a piston or Wankel engine.

  4. Twist compression tester - Wikipedia

    en.wikipedia.org/wiki/Twist_compression_tester

    The Twist Compression Tester ("TCT") is a hydraulically operated bench-top apparatus used to evaluate the level of friction and/or wear between two materials under lubricated or non-lubricated conditions. Under controlled conditions, a rotating annular specimen is brought into contact with a non-rotating flat specimen.

  5. Head gasket - Wikipedia

    en.wikipedia.org/wiki/Head_gasket

    Common test methods for head gasket leaks are a compression test (using a pressure gauge), a leak-down test or a chemical test that identifies hydrocarbons in the coolant fluid. [ 5 ] The cost of the replacement component (i.e. the head gasket itself) is usually relatively low, however there are significant labor costs involved in the ...

  6. Compression release - Wikipedia

    en.wikipedia.org/wiki/Compression_release

    Most small gasoline engines used in power equipment use an automatic compression release system of some kind, designed to reduce load on the starter motor or user manually starting the engine. The most common kind of small engine compression release uses a camshaft mounted mechanical lever that pushes the exhaust valve tappet slightly, venting ...

  7. I drove a $63,000 Infiniti QX60. It's a stylish luxury SUV ...

    www.aol.com/drove-63-000-infiniti-qx60-194939436...

    The 2025 QX60 is powered by Nissan's KR20DDET 2.0-liter VC-Turbo engine. The turbocharged inline-four produces 268 horsepower and 286 lb-ft of torque and is paired with a 9-speed automatic ...

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