Denso Iridium IKH24 One-Step Colder Spark Plugs for S60 V70 S60R V70R S40 V50 C30

IKH24

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If you're running higher boost or have an agressive tune, you may need spark plugs which are "colder" than stock to help avoid detonation, these Denso plugs are the best "colder" plug on the market.

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Denso Iridium plugs, one step colder, for your high boost Volvo.

There is a lot of talk "heat range" and "hotter" and "colder" spark plugs. Here is a brief explanation of spark plug heat ranges and what affect they have on your engine.

The heat range of a plug has no relationship to the electrical energy transferred through the spark plug. The heat range of a spark plug is the range in which the plug works well thermally. 

Low heat range (hotter) plugs have long insulator leg sections and the surface area affected by the flame and the gas pocket capacity are large. Also, since the heat release path from the insulator leg section to the housing is long, heat dispersal is low and the temperature of the center electrode rises easily. 


On the other hand, high heat range (colder) plugs have short insulator legs and the surface area affected by the flame and the gas pocket capacity are small. Also since the heat release path from the insulator leg section to the housing is short, heat dispersal is high and the temperature of the center electrode does not rise easily.

When the center electrode temperature is 500°C or lower, free carbon generated when the fuel does not combust completely is deposited on the surface of the insulator. Therefore, the insulation between the insulator and the housing falls, electricity leaks occurs, the spark across the gap is incomplete, causing ignition failures. This temperature of 500°C is called the self-cleaning temperature because above this temperature the carbon is naturally burnt away completely by combustion. Lower temperatures, where this does not occur typically cause a symptom called Carbon Fouling.

The opposite problem is when the center electrode reaches 950°C or higher, pre-ignition (early ignition) occurs, meaning that the electrode serves as a heat source and ignition occurs without a spark. Therefore, output falls and this can reach the level of electrode wear and insulator damage.

These particular Denso plugs are one step colder than the stock plugs, which means center electrode temperatures that do not rise easily, so they are unlikely to reach the pre-ignition temperature even at high speed. Therefore, this type of spark plug is generally used for high speed, high output engines.

Priced and sold by the each.

Fitment:

C30 2008 to 2013

S40 2004.5 to 2011

V50 2005 to 2011

C70 2006 to 2013

S60R 2004 to 2007

S60 T5 2005 to 2008

V70R 2004 to 2007

V70 T5 2005 to 2009

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Denso Iridium IKH24 One-Step Colder Spark Plugs for S60 V70 S60R V70R S40 V50 C30

Denso Iridium IKH24 One-Step Colder Spark Plugs for S60 V70 S60R V70R S40 V50 C30

If you're running higher boost or have an agressive tune, you may need spark plugs which are "colder" than stock to help avoid detonation, these Denso plugs are the best "colder" plug on the market.

Write a review