![]() This is necessary due to the increased heat production of the turbo engine. Note that the above four spark plugs have the same specifications as the extended projected tip models used in the 1.6 L engine, but are one heat range colder, 6 instead of 5 (or 20 instead of 16 in the Denso nomenclature). However, according to both and Denso, this is a Japanese plug only and the part is not available in the US. * According to TheMAN, this is the Denso equivalent of the NGK IZFR6F-11. NGK PZFR6F-11 Laser Platinum type, OEM fitmentĭenso VKJ20RZ-M11* Iridium Long Life type Graham bell Chapter 7: Combustion and the Ignition System, pages 236-237.Ģ003 Mazdaspeed Protege 2.0L, FS-DET Engine An additional benefit is that at high speeds the longer insulator nose is cooled by the incoming fuel charge to increase its cold heat range while at low speeds the long nose runs hotter to prevent fouling.įour-Stroke Performance Tuning, Third edition by A. This has the effect of advancing the ignition timing which in some cases can result in raising engine power output due to the more rapid flame propagation. These extended projected tip spark plugs are OEM in the JDM versions of the FS-DE and FP-DE engines.Īpparently, the extended projected tip starts the ignition flame front burning physically deeper in the combustion chamber which reduces the length of flame travel required for complete combustion. This places the electrodes closer to the center of the incoming A/F mixture with apparently beneficial consequences for power production. The two series of plugs have identical characteristics with the sole exception that the plugs for the 1.6 L engine have an extended projected tip. Spark Plug Substitution in the FS-DE Engineįollowing the recommendation of TheMAN, some of our Forum members with the 2.0 L, FS-DE engine (myself included), and the 1.8 L, FP-DE engine have replaced our spark plugs with those used in the 1.6 L, ZM-DE engine. Recommended as the performance plug of choice in street applications.ĭenso KJ16CR11 Original U-Groove, alternate OEM fitment as listed in the FSM.Īrranged in order of least to most expensive, the above five spark plugs have a reach (threaded length) of 19 mm (.750") are pre-gapped at 1.0-1.1 mm (.040"-.044") have a heat range of 5 (or equivalent) and an extended projected tip.ĭenso K16PR-U11 U-Groove type, alternate OEM fitment as listed in FSM.Īrranged in order of least to most expensive, the above six spark plugs have a reach (threaded length) of 19 mm (.750") are pre-gapped at 1.0-1.1 mm (.040"-.044") have a heat range of 5 (or equivalent) and a projected tip. 4 mm diameter U-groove niclkel alloy ground electrode. Iridium Power: Laser welded fine wire iridium tip center electrode. Longest sevice life of all Denso's plugs. Iridium Long Life: Laser welded fine wire iridium tip center electrode. By opening up the space between the electrodes, without increasing the gap, quench is reduced to a considerable extent.ĭouble Platinum: Platinum tip center electrode platinum ground electrode. Platinum tip center electrode, 1.1 mm diameter rather than being flat, the ground electrode's firing pad is a free-standing titanium-enhanced tip. Platinum TT: The TT stands for twin-tips. OEM for all proteges listed here except the MSP. Original U-Groove: Nickel alloy center electrode U-shaped nickel alloy ground electrode. ![]() Its iridium/platinum surfaces give it the longest service life of all NGK plugs making it an OEM approved design. ![]() Laser Iridium: Laser welded iridium tip center electrode platinum disc welded to backside of ground electrode. Because its platinum surfaces ensure a slow wear rate providing a longer service life, superior anti-fouling, improved fuel efficiency, and lower emissions, it is an OEM approved design. Laser Platinum: Laser welded platinum alloy tip center electrode platinum disc welded to backside of ground electrode. 6 mm diameter nickel alloy tapered ground electrode designed to minimize the "Quenching Effect." As a consequence, NGK recommends this as their performance plug for road cars. Iridium IX: Iridium tip center electrode. 6 mm diameter nickel alloy ground electrode. G-Power: Platinum alloy tip center electrode. OEM for all Proteges listed here except the MSP. V-Power: Nickel alloy V-grooved center electrode nickel alloy ground electrode.
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