Comparison Between Genuine DENSO and Fake Spark Plugs
Comparison of DENSO and Fake
Terminal Terminal has a glossy finish.
Marking Printed wording can be scraped off.
Housing Poor surface finish.
Screws & Electrode Poor thread quality finish.
Ceramic Insulator Poorly manufactured ceramic insulator with visible air bubbles trapped within witch affect heat dissipation capability.
Center Electrode A genuine DENSO spark plug has a copper-core center electrode with excellent heat conductivity. A fake DENSO spark plug does not, retaining heat that causes meltdown.
Problems Caused by Fake Spark Plugs
Inconsistent sparking causes incomplete combustion. Unburned fuel from a black sooty deposit on the spark plug.eventually leading to poor fuel economy and poor start up of the engine.
Poor heat dissipation due to the lack of a copper-core center electrode causes pre-ignition. As a result, engine power drops under highway driving or uphill driving conditions.
Continued usage of an overheated plug will damage the electrodes.
Why Power Drops and Melting Occurs
DENSO plug contains copper core
Quick heat dissipation. Copper is an excellent heat conductor. High temperature heat is quickly dissipated away from the center-electrode to prevent melt down.
Fake plug is iron only
Slow heat dissipation. Absence of copper-core center electrode result in poor heat dissipation capability. Prolonged use causes power loss due to excessive heat buildup. This result in melt down of the ground electrode, eventually leading to serious engine damage.