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  2. Leak-down tester - Wikipedia

    en.wikipedia.org/wiki/Leak-down_tester

    Compression tests should normally be done with all spark plugs removed to maximize cranking speed. Cranking compression is a dynamic test of the actual low-speed pumping action, where peak cylinder pressure is measured and stored. A compression tester. Leak-down testing is a static test. Leak-down tests cylinder leakage paths.

  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. Cold start (automotive) - Wikipedia

    en.wikipedia.org/wiki/Cold_start_(automotive)

    A cold start can be difficult for an engine due to higher viscosity of oil and fuel in cold temperatures. Generally speaking, diesel engines have more difficulty starting at low outside temperatures than gasoline engines, and electric engines have the most problems. Diesel engines do not use spark plugs to ignite the air fuel mixture and rely ...

  5. Engine balance - Wikipedia

    en.wikipedia.org/wiki/Engine_balance

    Engine balance refers to how the inertial forces produced by moving parts in an internal combustion engine or steam engine are neutralised with counterweights and balance shafts, to prevent unpleasant and potentially damaging vibration. The strongest inertial forces occur at crankshaft speed (first-order forces) and balance is mandatory, while ...

  6. OBD-II PIDs - Wikipedia

    en.wikipedia.org/wiki/OBD-II_PIDs

    The second, third, and fourth bytes (B, C and D) give information about the availability and completeness of certain on-board tests ("OBD readiness checks"). The third and fourth bytes are to be interpreted differently depending upon whether the engine is spark ignition (e.g. Otto or Wankel engines) or compression ignition (e.g

  7. U.S. engine maker facing largest Clean Air Act penalty ever ...

    www.aol.com/news/u-engine-maker-facing-largest...

    Engine manufacturer Cummins Inc. has agreed to pay a $1.675 billion penalty for allegedly installing "defeat devices" on approximately 1 million pickup trucks to cheat emissions tests.

  8. 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 ...

  9. Variable compression ratio - Wikipedia

    en.wikipedia.org/wiki/Variable_compression_ratio

    Variable compression ratio (VCR) is a technology to adjust the compression ratio of an internal combustion engine while the engine is in operation. This is done to increase fuel efficiency while under varying loads. Variable compression engines allow the volume above the piston at top dead centre to be changed. Higher loads require lower ratios ...

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