Ground connection for the spark plugs of a multi-cylinder internal-combustion vehicle engine

In a ground connection for spark plugs of a multi-cylinder, internal-combustion engine for a vehicle, in which each spark plug has a central electrode electrically connected to a positive pole of a vehicle battery and a metal spark plug casing, the metal spark plug casing of each spark plug including a ground electrode and being screwed into a cylinder head of the engine, the engine being electrically connected with a vehicle ground, and the vehicle ground being electrically connected with a negative pole of the vehicle battery, the improvement comprising:

• a plurality of additional ground cables having first and second ends, each first end of the plurality of additional ground cables being electrically connected with the metal spark plug casing of a respective spark plug;
• and
• a common ground cable electrically connected with the negative pole of the vehicle battery and with each second end of the plurality of additional ground cables,
• whereby the ignition of the engine is improved.