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DENSO Iridium Racing Spark Plug [IRL01-27] 5754

DENSO Iridium Racing Spark Plug [IRL01-27] 5754


DENSO Racing SparkPlug IRL0127 - Single Plug

Single Plug


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  • Description
  • Benefits
  • Technical Info
  • Shipping Explained

DENSO Iridium Racing Spark Plug [IRL01-27] 5754

General Details:

Diameter [mm]14
Spanner Size20.6
Tightening Torque [Nm]22
Weight [g]58
Spark Plug1 - Earthed Electrode
Thread Length [mm]21

Addtional Images:

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Please use our DENSO Spark Plug Lookup or contact us to find the right spark plug for your car

DENSO has been setting the standard for spark plug technology since 1959. They develop all of their ranges in-house, and manufacture them in their own ISO9000 certified factories worldwide - with 'zero defects' as standard. They also provide this outstanding OE quality to the aftermarket. Including Standard, Platinum and Iridium, DENSO Spark Plugs cover a complete range of continually updated references. Guaranteeing optimum engine performance, choose DENSO Spark Plugs for every automotive, motorcycle, marine and small engine application.

DENSO's unique Iridium Racing plugs feature iridium-rhodium alloy and a platinum tip on the ground electrode - for ultimate acceleration, engine output, ignition and spark voltage out on the circuit. These ultimate plugs have been specially tested and developed by DENSO for top level motor racing to give drivers superb engine response and unbeatable reliability - even in the most demanding conditions.

These plugs are recommended for drivers who care about:

  • Improved Acceleration
    Unbeatable acceleration performance on the circuit. With 0.4 mm diameter centre electrode, Iridium Racing plugs are the realisation of superb ignition performance and spark voltage at unparalleled levels. Misfires have been controlled and will allow you to have steadily high levels of response and increased acceleration.
  • Improved Horse Power
    More power with an ideal combustion cycle. Through superb ignition performance and spark voltage, non-firing and misfires under a variety of conditions has been greatly reduced. As a result, combustion conditions have improved dramatically, increasing engine output.

Spark Plug Health Check

Use Spark Plugs To Check Your Engine Health

Read More

Heat Ranges Explained

Learn what a spark plugs heat range means, and how it can effect your engine

Read More

Heat Cross Reference

Use our spark plug heat range cross reference table

Cross Reference Heat Range

PDF Downloads:

Download the Technical PDF


  • Improved cold-starting
  • More efficient fuel consumption
  • Better engine performance and acceleration
  • Smoother idling performance and throttle response
  • Original equipment quality now available to the aftermarket
  • Plugs available for all applications
  • Handles extreme compression and boost levels
  • Ultimate performance and durability
  • Maximizes track time, minimizes downtime

Technical Information:

Tech Data:

  • Thread Ø: 14mm
  • Thread Reach: 21.0mm
  • Hex Size:20.6mm
  • Heat Range: 27
  • Plug Type: 0.4mm Iridium centre electrode
  • Electrode Shape: Slant ground electrode or surface gap

Compatible OE part: MAZDA - N3##-18-110 ???


SHIPPING IS FREE* for orders of £75 and over , regardless of the weight of your order.
We've tried to keep all other shipping costs as low as we can.

Carriage starts at just £0.95 (inc VAT) for small items, with our most common courier rate set at £5.99 for orders of 5kg (enough for 5 litres of oil).

  • *Free shipping is available for UK Royal Mail, UPS Access Point™ (click & collect) and standard UK courier services (not express / priority / islands).
  • Courier surcharges mean we are unable to offer free "to the door" courier shipping from us in Cornwall up to Highlands / Grampian in Scotland - and because we send a lot of liquids, not every courier option is available to us. UPS Access Point™ (click & collect) is available as a free shipping option across Scotland, Wales and England, wherever there is a UPS Access Point™ Location.
  • Carriage charges are based on weight - please see our table of carriage costs for full details (although adding an item to your cart and viewing the calculated carriage is often easier!).
  • Priority shipping is also available.

How long will it take to get my order?

We give an estimate of delivery dates as you shop and in your basket. The vast majority of items are held in stock and dispatched from our UK warehouse and we'll do all we can to get your order to you as quickly as possible.

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"A premium, high-performance spark plug with extra-long life"

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