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. Today, driving to work I notice what feels like a misfire at low RPMs when shifting through the gears (5 spd).V-Power: Nickel alloy V-grooved center electrode nickel alloy ground electrode. The car fired up fine and I gave it an oil change for good measure. I went to Autozone yesterday with the intent of installing the plugs myself (most mechanics in my area closed on Sunday) and purchased the Bosch Platinum Plus 2's, which is a 2 prong design. I have AAA so I shut down immediately and had the car towed home to my driveway. They were standard Bosch Platinums and I had 19,000 miles on the plugs. The threads on the head and plug are fine and it appears maybe the mechanic installing them didn't tighten them down during the last tune-up (100K miles). Saturday night I had a spark plug literally pop-out of the cylinder head while on the interstate. Anyone tried Bosch "Platinum Plus 2" plugs in their '02 - '03 Protege 5 (2.0L)
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