Club X, Nissan X-trail Club, Philippines

jibong · Newbie Joined: 02 Mar 2009 Posts: 31 Location: qatar

jaz wanna ask you guys, recently i changed my plugs, and the salesman told me that i can replace mine with high performance plugs used with such cars as 350Z and maxima. i asked him kung platinum or iridium yung plugs but all i had was a blank face. nevertheless putting my trust on the fellow i went on buying and installing it.
my question is.. when i researched the part no. 22401-5M016 i found out its a "cold type" spark plug. can you guys enlighten me with these subject: cold vs hot. salamat.
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X32garrick · Posted: Tue Jun 02, 2009 1:54 pm Post subject:

Found this on Wikipedia...

"The operating temperature of a spark plug is the actual physical temperature at the tip of the spark plug within the running engine. This is determined by a number of factors, but primarily the actual temperature within the combustion chamber. There is no direct relationship between the actual operating temperature of the spark plug and spark voltage. However, the level of torque currently being produced by the engine will strongly influence spark plug operating temperature because the maximum temperature and pressure occurs when the engine is operating near peak torque output (torque and RPM directly determine the power output). The temperature of the insulator responds to the thermal conditions it is exposed to in the combustion chamber but not vice versa. If the tip of the spark plug is too hot it can cause pre-ignition leading to detonation/knocking and damage may occur. If it is too cold, electrically conductive deposits may form on the insulator causing a loss of spark energy or the actual shorting-out of the spark current.

A spark plug is said to be "hot" if it is a better heat insulator, keeping more heat in the tip of the spark plug. A spark plug is said to be "cold" if it can conduct more heat out of the spark plug tip and lower the tip's temperature. Whether a spark plug is "hot" or "cold" is known as the heat range of the spark plug. The heat range of a spark plug is typically specified as a number, with some manufacturers using ascending numbers for hotter plugs and others doing the opposite, using ascending numbers for colder plugs.

The heat range of a spark plug (i.e. in scientific terms its thermal conductivity characteristics) is affected by the construction of the spark plug: the types of materials used, the length of insulator and the surface area of the plug exposed within the combustion chamber. For normal use, the selection of a spark plug heat range is a balance between keeping the tip hot enough at idle to prevent fouling and cold enough at maximum power to prevent pre-ignition leading to engine knocking. By examining "hotter" and "cooler" spark plugs of the same manufacturer side by side, the principle involved can be very clearly seen; the cooler plugs have more substantial ceramic insulators filling the gap between the center electrode and the shell, effectively carrying off the heat, while the hotter plugs have less ceramic material, so that the tip is more isolated from the body of the plug and retains heat better.

Heat from the combustion chamber escapes through the exhaust gases, the side walls of the cylinder and the spark plug itself. The heat range of a spark plug has only a minute effect on combustion chamber and overall engine temperature. A cold plug will not materially cool down an engine's running temperature. (Too hot of a plug may, however, indirectly lead to a runaway pre-ignition condition that can increase engine temperature.) Rather, the main effect of a "hot" or "cold" plug is to affect the temperature of the tip of the spark plug.

It was common before the modern era of computerized fuel injection to specify at least a couple of different heat ranges for plugs for an automobile engine; a hotter plug for cars which were mostly driven mildly around the city, and a colder plug for sustained high speed highway use. This practice has, however, largely become obsolete now that cars' fuel/air mixtures and cylinder temperatures are maintained within a narrow range, for purposes of limiting emissions. Racing engines, however, still benefit from picking a proper plug heat range. Very old racing engines will sometimes have two sets of plugs, one just for starting and another to be installed once the engine is warmed up, for actually driving the car."
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jibong · Newbie Joined: 02 Mar 2009 Posts: 31 Location: qatar

medyo nahilo ako dun ha. thanks boss garrick.
follow up question? what do we have in our x trail ba? hot or cold?
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X2 · Posted: Sun Jun 07, 2009 9:37 pm Post subject:

Nasa low heat range siya which means hot plug. I'm currently using a denso plug IKH16 if i'm not mistaken.

machoman · Posted: Sun Jun 14, 2009 10:26 pm Post subject: re

X32garrick · Posted: Mon Jun 15, 2009 3:41 pm Post subject:

You're welcome machoman Very Happy

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machoman · Posted: Thu Jun 25, 2009 2:36 am Post subject: re

ihope you can share more thread like this sir para sa ibang mga reader

speedyfix · Consultant Joined: 14 Jun 2006 Posts: 151

denso 16's are a 5 heat range plug. hot pa classification nun.
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jibong · Newbie Joined: 02 Mar 2009 Posts: 31 Location: qatar

Mga bossing, yesterday biglang nagloko ang x trail ko, kumakadyot sya, i dont know what kasi ang english term nun =)
anyways, i have replaced my plugs at 30,000 km and now its 56,000 eventhough plugs agad nasa isip ko, iniisip ko na imposible naman na mapundi agad plugs ko, ang mahal pa naman nung bili ko dun.
anyways, i checked it and to my surprise, sunog yung isang plug ko. hindi ko kasi alam mag post ng pic i hope na pi-picture nyo ibig ko sabihin. kasi yung side electrode ko nag bend na at dumukit dun sa center electrode dahil sa sobrang init.
kaya ayun bumili na lang ako nung normal type (22401-8H516) ayun mukhang ok naman na sya, baka pag uwi ko na lang pinas ako bumili ng magandang klase.
what do you think happened? anyone had the same problem before? do i have to do something else to prevent it from happening again? maybe my x trail is telling me something...
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