Best Spark Plugs in the UK

Review & Comparison, Last Update October 6, 2020
Spark plugs are small but mighty. These little devices create the ignition for the combustion that's necessary to start your car. The best spark plugs will be able to offer improved spark whilst reducing the travel time from the spark to the combustion gases. ...Read more ...Read less
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BEST 2020
PROS
CONS
OUR VERDICT
Kit Contents
Material
Seat Type
Reach
Hex Size
Warranty
 
PROS

The centre electrode tip incorporates 4 yttrium-enhanced ground electrode tips that create an instant unwavering spark, enabling efficient combustion. The tips smooth out the start as well as make the run more consistent. The plug arrives re-gapped already.

CONS

The gasket is not always tight. 

OUR VERDICT

The Bosch FGR7DQP+ is aimed at drivers that cover considerable distances on a frequent basis. Besides delivering smooth acceleration, the plug improves fuel economy and ensures excellent engine performance, also making the engine more responsive.

detailed parameters
Kit Contents

Pack of 1 spark plug

Material

Platinum centre electrode tip with 4 yttrium-enhanced ground electrode tips

Seat Type

Gasket

Reach

19 mm

Hex Size

16 mm

Warranty

7 years

PROS

Adopting a nickel alloy сentre electrode tip that features a copper centre core, this plug will not start corroding or rusting with time. The plug is also great at resisting fouling. Both materials increase its conductivity as well as heat control. 

CONS

The model is quite pricey. 

OUR VERDICT

The Champion RCJ6Y Spark Plug improves the spark and reduces its travel time. Since the thread reach measures 9.5 millimetres, this plug will be able to work with garden equipment (including chainsaws and brush cutters), motorcycles, ATVs, and some vintage cars.

detailed parameters
Kit Contents

Pack of 1 spark plug

Material

Nickel alloy сentre electrode tip with a copper centre core

Seat Type

Gasket

Reach

9.5 mm

Hex Size

19 mm

Warranty

1 year

PROS

The copper centre core prevents the plug from overheating. The model resists carbon buildups and pre-ignition. The patented triple-gasket sealing process removes combustion leakage from the equation, improving emissions as much as reducing exhaust fumes.

CONS

The centre electrode is fragile. 

OUR VERDICT

Cars, motorcycles, ATVs, string trimmers, leaf blowers, lawn mowers, the Briggs and Stratton 992304 can accommodate them all, as long as 'them all' come equipped with an overhead valve engine. Despite its versatility and effectiveness, the plug is pretty cheap.

detailed parameters
Kit Contents

Pack of 1 spark plug

Material

Nickel alloy centre electrode tip with a copper centre core

Seat Type

Gasket

Reach

19 mm

Hex Size

16 mm

Warranty

2 years

PROS

The J-type gap makes the plug compatible not just with garden equipment and motorised saws but also with jet skis and most petrol engines. More often than not, you'll be able to use this plug with ATVs and motorcycles.

CONS

The plug sometimes comes without a cardboard box. 

OUR VERDICT

The Champion RJ19LM Engine Spark Plug will prove equally efficient and consistent short-term and long-term. With its nickel alloy centre electrode tip, the model always creates an unwavering spark. Plus, the housing is resistant to vibrations.

detailed parameters
Kit Contents

Pack of 1 spark plug

Material

Nickel alloy centre electrode tip with a copper centre core

Seat Type

Gasket

Reach

9.5 mm

Hex Size

19 mm

Warranty

1 year

PROS
Employing corrugated ribs, the plug prevents flashovers. Introducing pure alumina silicate ceramic insulation, the model improves heat transferring and increases its strength. The copper centre core aids heat removal.
CONS

Some customers comment that the model's lifespan is short. 

OUR VERDICT

Apart from protecting the plug against corrosion, the NGK 4626 BPMR7A also provides great anti-seizing properties. Likewise, the triple seal prevents leaks and, ensuring reliable combustion, increases the engine's service life.

detailed parameters
Kit Contents

Pack of 1 spark plug

Material

Nickel alloy centre electrode tip with a copper centre core

Seat Type

Gasket

Reach

9.5 mm

Hex Size

19 mm

Warranty

1 year

X

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Bosch FGR7DQP+

Smooth Operator

The Bosch FGR7DQP+ delivers deliver smooth acceleration, excellent fuel economy, as well as improved engine performance. Furthermore, the plug takes less time reaching self-cleaning temperatures, making its performance more responsive.

Made from platinum, the centre electrode tip comes outfitted with 4 yttrium-enhanced ground electrode tips. Creating a powerful spark, these enhanced tips enable efficient combustion, not just smoothing out the start but also making the engine's run more consistent. Because the plug is re-gapped, installation requires almost no time at all. Plus, the gap's indicated on the package, meaning that you won't be wasting time figuring out the required adjustment.

But the gasket that the plug comes with is not always tight initially, so we would not advise against tightening the plug up before installation. Circling back towards the platinum construction though, aside from protecting the plug against rust and corrosion, the material also makes sure the unit does not get brittle with time. The engineers at Bosch are so certain that the plug will remain unaffected that they have extended the warranty 7 years, so you won't be replacing this spark plug anytime soon.

Review of Bosch FGR7DQP+ Spark Plug

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Champion RCJ6Y

Championing an Improved Spark

Champion RCJ6Y Spark Plug champions an improved spark and reduced travel time from the spark to the combustion chamber. Not unlike the company's previous models, this plug is made from heavy-gauge, high-impact nickel alloy сentre electrode tip with a copper centre core, making sure that both the housing and the tip do not start displaying corrosion signs or forming rust patches eventually. Apart from that, the plug also resists fouling, but the biggest change that this construction makes is increasing the plug's conductivity and heat control, preventing the engine from wearing out before its time.

With its 9.5-millimetre thread reach, the model will be able to accommodate vintage cars, motorcycles, and garden equipment. That said, there are ATVs and boats that the plug will fit as well.

Setting machines aside, some chainsaws are also compatible with this plug but that's beside the point. The point is that, first and foremost, this plug gives you consistent cold starts and quick acceleration, making sure that even the least reliable engines behave well. Provided you don't mind the somewhat expensive price, there's almost no chance that the Champion RCJ6Y Spark Plug will leave you disappointed.

Review of Champion RCJ6Y Spark Plug

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Briggs and Stratton 992304

Triple-Gasket Sealing Process

Despite its value-oriented disposition, the Briggs and Stratton 992304 can trade blows with the most expensive spark plugs. Having said that, we're not crazy about the centre electrode. From what we can tell, it is a little fragile. Nevertheless, again, this model can throw down with the best. 

Resisting carbon buildups as well as pre-ignition, the plug treats the engine with the care and respect that the car's heart deserves. Besides accelerating and smoothing out cold starting, the model makes sure that the overall run also remains smooth. Considering the 19-millimetre thread reach and its 19-millimetre hex size, this plug will prove compatible with most overhead valve engines (maybe even all). 

But the biggest standout feature has to be the NGK's patented triple-gasket sealing process anyway. In addition to eliminating combustion leakage, this sealing process also improves emissions and reduces exhaust fumes, making the engine a little more forgiving towards the environment. 

All things considered, the people whose commute involves countless stops and frequent speed shifting will appreciate the Briggs and Stratton 992304 the most. Also, the model will work with most garden equipment, including string trimmers, blowers, and lawn mowers.

Review of Briggs and Stratton 992304 Genuine Spark Plug

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Champion RJ19LM

A Consistent Spark

As you would expect, the Champion RJ19LM Engine Spark Plug is not that different from its RCJ6Y stablemate. Primarily, the plug replaces the NGK BR2LM model that most lawn mowers, jet skis, and chainsaws come with from the factory. The similarities include the J-type gap that makes the model compatible with 9/10 petrol engines.

Of course, rubbing shoulders with the aforementioned plug, this unit has a 9.5-millimetre thread reach and a 19-millimetre hex size. With these specs, the model fits most pieces of garden equipment. The majority of motorcycles and ATVs work with these specs as well. The plug will not be able to suit modern cars but there are some vintage cars that can make it work.

Construction-wise, making the centre electrode tip from nickel alloy, this unit gives you a consistent spark without hiccups, so you should have no problems cold-starting the engine. In the meantime, the copper centre core will make sure that the plug does not overheat. Looking at the package, plug sometimes comes without a cardboard box, making things a little uncomfortable initially. Barring this little mishap, the Champion RJ19LM Engine Spark Plug will not inconvenience you short-term as well as long-term.

Review of Champion RJ19LM Engine Spark Plug

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NGK 4626 BPMR7A

Excelent Anti-Seizing

The NGK 4626 BPMR7A is the original piece that most petrol engines come from the factory. To start with, the plug adopts trivalent metal plating, not just protecting the unit from corrosion but also providing excellent anti-seizing properties. What's more, featuring corrugated ribs, the model prevents flashovers. But, before that, the plug introduces pure alumina silicate ceramic insulation, improving heat transferring and increasing its strength.

When this part is done, the copper centre core takes centre stage, aiding heat removal. Then, the plug unleashes its triple seal, preventing leaks. Leaving prevented leaks behind, the same seal also ensures reliable combustion, increasing the engine's lifespan.

The issue here is that, while the plug is working towards this increase, its own lifespan is pretty short, which's unfortunate and, truth be told, a little surprising considering that everything else about this product is first-class.

Nevertheless, taking into account everything that we have outlined above, as well as the plug reducing carbon deposits, the NGK 4626 BPMR7A is a force to be reckoned with, a force that very few engines will mind having by their side. Also, the nickel alloy centre will prevent the electrode tip from overheating.

Review of NGK 4626 BPMR7A Spark Plug

Additional Info

    Manufacturer


 

What Is a Spark Plug?

A spark plug is a device that delivers the electric current from the car's ignition system to the combustion chamber present in any spark-ignition engine. It ignites the compressed fuel-air mixture using an electric spark, all while keeping the combustion pressure "locked" within the engine. A plug like that will have a metal-threaded shell that is electrically isolated from its central electrode with a porcelain insulator.

Now, it is all very technical and there's a decent chance you're already familiar with these basics and don't necessarily need our help in that regard. As far as the selection part is concerned, there are many things that differentiate quality plugs from subpar products.

Any ribbed insulator design will always prove a good place to start as it will be able to prevent the flashover issue that so many mediocre plugs have been known to cause and/or fail to mediate. You can never go too wrong with fine wiring tips as these little components excel at reducing the required voltage. All in all, as long as the plug is able to offer reliable cold starting and quick acceleration, you shouldn't have too many issues making it work.

Using OBD2 scanners, you'll be able to inspect your car anytime, anywhere. New jumper cables will not necessarily hurt too, so you might want to consider adding them to your shopping cart.

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Publish Date: 2020-10-06 12:44:16