What do technicians need to know about spark plugs? DENSO answers the key questions
Supersessions within the Spark Plug range
30 June 2017 | Article
Supersession of Automotive Iridium Power and Tough plugs to Iridium TT (IrTT). Fast moving SC20HR11 Iridium Spark Plug superseded with SC16HR11
Supersession of Automotive Iridium Power and Tough plugs to Iridium TT (IrTT)
For automotive applications, Iridium TT will supersede a part of the Iridium Power and Iridium Tough range.
After 20 years of 0.4mm patented Iridium we are now moving forward with Iridium TT long life for
automotive applications. Iridium TT utilizes 0.4mm center electrode, with an addition of a needle type ground electrode. This new development is the next step of evolution in Iridium technology and continues the high quality legacy of Iridium Power and Tough.
From June 2017 we will automatically supersede the phased out Iridium Power and Iridium Tough references to the new Iridium TT. You will receive stock of the new IrTT plug if the old stock is depleted. This will ensure delivery of the correct alternative Spark Plug in case you order the old reference.
Below is a Cross Reference overview with applicable part numbers.
Fast moving SC20HR11 Iridium Spark Plug superseded with SC16HR11
Part Number SC20HR11 will be phased out. Due to OE requirements all demand will continue to the existing SC16HR11.
In the past only the 2014 Aygo/108/C1 and Yaris had 16 heat range, however going forward all other engines will move from SC20HR11 to the SC16HR11 Spark Plug. For Aftermarket it is safest to switch gradually to SC16HR11 for the whole connected car parc and sell out the current stock
of SC20HR11. We will supersede SC20HR11 with SC16HR11 automatically in terms of ordering and delivery, following Toyota’s decision. Please refer to the DENSO Spark Plug catalogue for the correct crossing.
Due to OE requirements DENSO has to change the heat range from 20 to 16. These connected applications are mainly Toyota engines. The OE car manufacturer has already switched to SC16HR11 for newly manufactured vehicles. The Aftermarket will follow this consequently.
The level of heat range is connected to low or high speed driving. The initial choice for the right heat range is a result of expectations towards average use of the engine. After a few years of experience with this engine, the manufacturer decided to lower the heat range.
In all digital catalogues like TecDoc and MAM, the change will take effect in June 2017.
From June 2017 onwards we will automatically supersede SC20HR11 with SC16HR11. This will ensure delivery of the correct Spark Plug in case you order the old reference.
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