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How should spark plugs be tightened for best performance?

April 26, 2017best PERFORMANCE plugs SPARK tightened

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How should spark plugs be tightened for best performance?

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A. Bosch recommends when installing spark plugs to use a torque wrench and the correct torque in ft.-lbs. As listed below: 10mm With Gasket 12mm With Gasket 14mm With Gasket 14mm Tapered Seat 18mm With Gasket 18mm Tapered Seat Torque FT.-LBS. 8-11 12-15 19-22 12-15 20-23 14-17 If a torque wrench is not available, hand tighten the plug until it is seated in the cylinder head. Spark plugs with gaskets should be tightened an additional 90? Spark plugs with tapered seats should be tightened an additional 15? Click here to see a diagram of proper torquing. NOTE: AVOID OVER TIGHTENING OR UNDER TIGHTENING AS SPARK PLUG OR ENGINE DAMAGE MAY RESULT.