Spark Plug Review

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(More customer reviews)Switching to these plugs from the stock BMW plugs (nee NGK) markedly improved the smoothness of my Mini Cooper S under acceleration. One review I read actually got improved dyno numbers from switching to these plugs, but to my seat-of-the-pants evaluation, the smoothness across the board is the most noticeable change.
They're bit pricey, though, especially considering that I will likely switch to their cooler plug (IK22 vs these IK20's) when I install my 15% supercharger pulley upgrade later this year.

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Denso 5305 Iridium Spark Plug , Pack of 1 Review

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(More customer reviews)I fitted this plugs into a Chevrolet Spark a while ago, haven't caused me trouble at all. Thought i had to adjust the gap of the plugs ( since usually new ones are a bit separated), starting the engine became faster and warming too, felt the acceleration somewhat stronger, fuel economy is a bit higher than OEM ones ( think this plugs might work better into bigger engines) but as I told you already they are doing great no foul ones, and burning equally.

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Denso Iridium Spark Plugs are designed to ignite the air-fuel mixture in the engine cylinder by generating sparks between the center electrode and earth electrode. They employ an iridium alloy for the center electrodes and provide superb ignition performance. These plugs have lower fuel consumption and higher acceleration performance as well as stable combustion during idling, which contribute to the cleaner exhaust.

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Pulstar dg1i Iridium Pulse Spark Plug, Pack of 1 Review

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(More customer reviews)i brought this for my 2010 altima coupe 2.5s, amazon said it would fit but doesnt which sucks just letting everyone know.

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Pulstar Iridium Pulse Plugs are the first real breakthrough in spark plug technology in over 120 years. They look and fit like spark plugs, but contain an integrated electrical capacitor, which focuses the energy of the plug in much the same way that a camera flash intensifies light. The result is peak electrical energy delivered to the fuel mixture that is far beyond that typical of conventional spark plugs, allowing for more complete combustion that in turn produces not only better fuel efficiency, but also increased torque and horsepower. Viewlarger.

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6 New DENSO Iridium Spark Plugs IK20 # 5304 Review

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(More customer reviews)These worked very very well.
In both my 1998 BMW 323is [M52 IIRC] as well as my 2001 525iT [M54] they went in just fine and the cars both ran without a hiccup after install.
Replacing the OEM NGKs in the 5er, and Bosch plugs in the 3er.
\o/ no check engine lights!

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DENSO Iridum Spark Plug, 14mm Thread, 19mm (3/4") Reach, 5/8" (16mm) Hex Size, Gasket Seat, Resistor, Removable Terminal, ISO height, 0.4mm Iridium Center Electrode, Tapered Cut U-groove Ground Electrode, .044" (1.1mm) Gap, Heat Range 20

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Denso (5305) IW16 Iridium Spark Plug, Pack of 1 Review

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(More customer reviews)This has the 0.4mm tip which Denso says to replace in 30,000 miles. I replaced the distributor cap, rotor and the plugs as I do each 10,000 miles. When I purchased them I assumed they would last 120,000 miles, but the ones that last that long have the 0.7mm tip. My 1994 4 cyl Toyota pickup runs better and idles more smoothly.
For the last 21 tanks of gas the average gas mileage was 19.819. With the Iridium plugs the mileage was 21.045. I normally use 89 octane on the next tank I will try 87 because I read the iridium reacts with the benzine for a better burn.
Based on the improvement above I would use 88.188 less gallons of gas over a 30,000 mile period which would save $238.11 based on gas at $2.70 a gallon.
The newer cars (my 2003 Corolla is an example) came with iridium plugs so I would think only the older cars would benefit from this upgrade.
I used Amsoil Performance Improver, the tank that ran the PI got 20.3 mpg, the last time I ran a tank of PI I got 17.5 mpg with regular Toyota plugs. I continue to get about 1.1 mpg better with these plugs.

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Denso Iridium Spark Plug Denso's Iridium power spark plugs help your vehicle achieve unparalleled performance. It alters the belief that a mere spark plug can add power and mileage. This is done by combining an ultra-fine 0.4mm diameter Iridium center electrode with a tapered cut U-groove ground electrode. Iridium conducts electricity better than platinum, however what makes it exceptional is it's also 6x harder and 8x stronger than platinum. Because of this, the center electrode can be machined down to 0.4mm. This ultra-fine iridium center electrode provides superior ignition performance during acceleration and top cruising RPM. The U-groove ground electrode creates a larger, brighter flame kernel. The tip of the ground electrode has been tapered which further improves firing performance by reducing quenching. All of these features combine to give more horsepower to your motor. Technical Specifications - 14mm Thread, 19mm (3/4") Reach, 13/16" (20.6mm) Hex Size, Gasket Seat, Resistor, Removable Terminal, 0.4mm Iridium Projected Center Electrode, Tapered Cut U-groove Ground, .044" (1.1mm) Gap

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NGK (6637) BPR6EIX Iridium IX Spark Plug, Pack of 1 Review

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(More customer reviews)These are wonderful spark plugs . Thank you for your excelent service too.
Kind regards. André

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NGK iridium plugs represent the ultimate evolution of spark plug technology and performance. The iridium center electrode is both stronger and harder than platinum. This allows NGK engineers to design an ultra-fine (0.6mm)center electrode reducing the voltage requirement for spark. This allows for a brighter, stronger spark from your existing ignition system. The ground electrode has a tapered cut at the firing end which reduces quenching for better flame core growth and increased ignitability. The combination of fine wire center electrode and tapered cut ground will increase performance, improve acceleration, and fuel efficiency. Technical Specifications - Iridium IX Plug, 14mm Thread, 19mm (3/4") Reach, 13/16" (20.6mm) Hex Size, Gasket Seat, Resistor, Removable Terminal, JIS Height, Projected Tip, Fine Wire (0.6mm) Iridium Center Electrode, Tapered Cut Ground Electrode, .032" (0.8mm) Gap

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NGK (6962) BKR6E Standard Spark Plug, Pack of 1 Review

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(More customer reviews)Purchased two NGK (3481) DCPR6E spark plugs for a Nissan 9.8 HP outboard motor. One of the old plugs had fouled out and the motor had been running very roughly probably on just one cylinder part of the time. The items purchased were as received as described by Amazon and the shipment was delivered in a reasonable amount of time. I installed the new plugs and the outboard motor is now running great and both cylinders are firing 100%.

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NGK Standard Spark Plug is manufactured to enhance the performance of the vehicle. It is constructed from durable material that is corrosion and abrasion resistant. The Spark plug insulators are made of 99 percent pure alumina silicate, allowing for longer insulator noses for reduced fouling. This Spark plug features a triple gasket sealing process that eliminates fuel leakage. It also includes a solid copper core that provides superior heat dissipation and conductivity. This Spark plug has resistor that is produced with a glass and carbon mixture, which is fired to ensure superior performance and durability. It has corrugated ribs that prevent flash over and cold rolled threads to inhibit damage to the cylinder head.

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NGK (7092) BKR6EGP G-Power Platinum Spark Plug, Pack of 1 Review

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(More customer reviews)The more I change the plugs on the old flat 4 subie the easier it seems to go. Changing plugs right before a 1420 mile road trip. Averaged mid to high 20 mpg which is doing well for my car. Factory brand plugs in normal heat range. No frills or gimmicks they just work great and burn clean.

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NGK G-Power Platinum Spark Plugs are designed to provide excellent ignitability and enhanced throttle response. They are built to OEM specifications and feature trivalent metal plating which provide long lasting durability and protection against anti-seizing. These spark plugs increase fuel economy and lowers emission providing outstanding performance. They reduce ignition system voltage requirements and are corrosion resistant.

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Autolite XP3923 Xtreme Performance Iridium Spark Plug , Pack of 1 Review

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(More customer reviews)Got some Autolite XP 3923s for my Toyota Sienna 2001. And they seem to work fine as replacements. Fast start, smooth idle, and the engine runs just like using OEM NGK or Denso plugs. But these are considerably cheaper and come with a 5 yr warranty. Based on a previous reviewer, I was afraid the end of the plug was going to have a strange head that would cause my Sienna ignition wire boots to slip off the end every couple of days. But the head was similar in shape to the dealer installed Denso long life iridium SK20R11's. Moreover, ignition wire boot slipping off won't happen on newer Toyota's which have separate ignition coil/boot pairs for each pair of plugs (3 sets for a V6 ) and these are each screwed down with a 10mm x 40mm long bolt to the engine block. So no slipping fears at least for me. Also, I can report no noticeable decrease in mileage. And the minivan drives as dependably as it usually has with smooth acceleration. It was really simple to replace these on the front 3, but as usual with tranverse mount V6 Toyotas, changing out the back 3 is difficult due to restricted access for tools to get back in there, which is why I hope these last a LONG time. We'll see how the 5 yr warranty holds up.

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Autolite XP Xtreme Performance spark plugs are one of the brand's most technologically advanced spark plugs. Consumers get the benefits of patented platinum sidewire technology for improved durability and longer life, along with an iridium-enhanced .6mm finewire design for improved ignitability. Independent lab tests show that Autolite XP Xtreme Performance spark plugs provide better overall ignitability and durability than many other premium spark plugs. By increasing the size of the flame kernel (a 21 percent bigger flame compared to standard sparkplugs), these Autolite spark plugs ignite more gas and air mixture inside the cylinders to deliver better overall ignition. The ignition is more focused, which provides faster fuel combustion, optimizing the vehicle's spark plug performance. In addition, the Autolite XP Xtreme Performance spark plug offers drivers the same durability as the Autolite Double Platinum sparkplug ¿ virtually no gap erosion, longer life, and top fuel efficiency over the life of the plug. Autolite XP Xtreme Performance sparkplugs can be used in nearly 90 percent of passenger cars and light duty trucks on the road today.

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Bosch (4506) WGR8DQI Platinum IR Fusion Spark Plug, Pack of 1 Review

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(More customer reviews)You can find a better deal somewhere else for these plugs. Amazon claims they are 89% off. You would think you're getting a pack of 4 plugs for a deal like that. This is not true. You only get 1 spark plug. Name one bosch plug that has a retail of over $52? I have found other issues where Amazon shows a bogus MSRP for items. DO NOT BUY THESE!

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Bosch Platinum IR Fusion spark plug has an iridium and platinum fused center electrode with surface air-gap firing delivering optimum horsepower, better than OE iridium plugs.

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