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Zato 😁 Spark-plug length varies because different engines and cylinder-head designs require different physical reach, heat management, and sealing characteristics. “Length” usually refers to the threaded portion (reach) and the insulator nose length; both affect fit, combustion and cooling. Key reasons and effects Reach (threaded length) Provides proper spark location relative to the piston and combustion chamber. Correct reach positions the electrode in the optimal combustion zone for flame propagation and avoids impact with valves or piston crowns. Ensures correct sealing with the cylinder head and engagement with the thread depth specified by the manufacturer. Wrong reach can cause exhaust leaks (too short) or physical contact/damage (too long). Insulator nose length (projecting ceramic) Influences heat dissipation and quenching. A longer nose projects further into the combustion chamber and changes the thermal profile of the plug. Changes likelihood of pre-ignition or fouling. Too-hot plugs (insufficient heat-sinking) can cause pre-ignition; too-cold plugs (excessive heat-sinking) foul with deposits. Manufacturers pair nose length with a heat-range rating to manage this. Electrode position and combustion dynamics Electrode location relative to the center of the chamber and incoming fuel/air jet affects ignition quality and flame kernel growth. Some engines (high-compression, direct-injection, or specific combustion-chamber shapes) require one configuration to optimize burn and emissions. Mechanical and service considerations Extended reach may be required for recessed or deep combustion chambers; short reach for shallow or pent-roof heads. Aftermarket performance plugs sometimes use different lengths to accommodate custom heads, turbochargers, or nitrous setups, but proper fitment is critical. -
Boljsa eksplozija, boljse izgorevanje. Kar pomeni malenkost boljsa odzivnost in malo manjsa poraba.
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Bemtiš, navoja ima pa, ko da vžiga v karterju... Jah, ki čm, kmet an s hribu doma, pei nism še vidu deuge svečke kt une od motorke... -
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