|  | Topic : Spark plugs |  |
| | | large | | Set |  |  | | Reg. Date | : | 22/08/2009 | | Posts | : | 168 | | Location | : | North Tazewell, virgina, United States |
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| | Posted : 14 Apr 2015 - 01:22 Post title : Spark plugs | | | I decided to try something different I have the bb kit, gutted cat, k&n filter, long tors, and have been running dizzes no cat tune. The plugs seem to be to hot so I installed NGK DPR7EIX-9 Iridium IX Spark Plugs they are one step colder. I am amazed at the power difference and seems smoother at high rpms 
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| | | daz | | Zeus | |  | | Reg. Date | : | 12/05/2009 | | Posts | : | 7,686 | | Location | : | United States |
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| | Posted : 14 Apr 2015 - 02:16 Post title : Re: Spark plugs (Re: large) | | | See people !!! I've been saying this forever. I used to use NGK iridiums in my speedamster and i swear i got as much gains as i did from pipes, maybe more. But i never used em in the bird because they don't make em in our range. What exactly is the result of using a colder plug? Maybe i'll have to give em a go regardless.
| 2010 Blue/White Thunderbird, "Brutus". 1700 kit, short tors, gutted cat, UNI filter, filter seal off, custom tune. Brutus in his native habitat: Link
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| | | davetac1 | | Thunderbird | | | Reg. Date | : | 06/09/2010 | | Posts | : | 8,379 | | Location | : | Haverhill, Ma., United States |
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| | Posted : 14 Apr 2015 - 05:45 Post title : Re: Spark plugs (Re: daz) | | | A colder heat range plug is generally for a performance application because the combustion chamber temps run higher.However,low end performance,driveability and ecomony will suffer somewhat.The heat range number plug which comes from the factory in said vehicle is supposed to be the happy medium plug to suit all functions of that particular vehicle.It's when ya start modifying it,higher compression pistons,bigger valves,hotter cam[s],porting,polishing,bigger exhaust,etc.when you would wanna run a colder heat range plug.Other then that,there's really no big gain form using the colder heat range plug.I mean using one heat range colder may not effect it much,but will effect it to some extent.
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| | | easyrider | | Thor | |  | | Reg. Date | : | 17/12/2011 | | Posts | : | 2,066 | | Location | : | NSW, Australia |
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| | Posted : 14 Apr 2015 - 07:09 Post title : Re: Spark plugs (Re: davetac1) | | |
davetac1 wrote:
A colder heat range plug is generally for a performance application because the combustion chamber temps run higher.However,low end performance,driveability and ecomony will suffer somewhat.The heat range number plug which comes from the factory in said vehicle is supposed to be the happy medium plug to suit all functions of that particular vehicle.It's when ya start modifying it,higher compression pistons,bigger valves,hotter cam[s],porting,polishing,bigger exhaust,etc.when you would wanna run a colder heat range plug.Other then that,there's really no big gain form using the colder heat range plug.I mean using one heat range colder may not effect it much,but will effect it to some extent. |
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Say u fit a supercharger, would a cold plug be a option??
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| | | rabbi | | Chaac | |  | | Reg. Date | : | 28/02/2012 | | Posts | : | 926 | | Location | : | Geelong, Victoria, Australia |
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| | Posted : 14 Apr 2015 - 10:03 Post title : Re: Spark plugs (Re: easyrider) | | | From the NGK website
I Have Slightly Modified My Motor - Do I Need a Colder Spark Plug?
September 30, 2012
The term Heat Range refers to the speed with which a plug can transfer heat from the combustion chamber to the engine head. Whether the plug is to be installed in a boat, lawnmower or race car, it has been found the optimum combustion chamber temperature for gasoline engines is between 500°C–850°C. Within that range it is cool enough to avoid pre-ignition and plug tip overheating (which can cause engine damage), while still hot enough to burn off combustion deposits that cause fouling.
The spark plug design determines its ability to remove heat from the combustion chamber. The primary method used to do this is by altering the internal length of the core nose. In addition, the alloy compositions in the electrodes can be changed. This means you may not be able to visually tell a difference between heat ranges.
*When a spark plug is referred to as a "cold plug", it is one that transfers heat rapidly from the firing tip into the engine head, keeping the firing tip cooler.
*A "hot plug" has a much slower rate of heat transfer, which keeps the firing tip hotter.
An unaltered engine will run within the optimum operating range straight from the manufacturer, but if you make modifications such as adding a turbo or supercharger, increasing compression, timing changes, use of alternate fuels, or sustained use of nitrous oxide, these can alter the plug tip temperature, necessitating a colder plug.
A good rule of thumb is, one Heat Range colder for every 75–100hp added.
In identical spark plug types, the difference from one full Heat Range to the next is the ability to remove 70°C to 100°C from the combustion chamber.
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| | | easyrider | | Thor | | | | Reg. Date | : | 17/12/2011 | | Posts | : | 2,066 | | Location | : | NSW, Australia |
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| | Posted : 14 Apr 2015 - 19:37 Post title : Re: Spark plugs (Re: rabbi) | | | Thanks Rabbi, looks like a cold plug for me.
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| | | edbob | | Chaac | |  | | Reg. Date | : | 04/04/2012 | | Posts | : | 931 | | Location | : | United States |
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| | Posted : 14 Apr 2015 - 20:57 Post title : Re: Spark plugs (Re: large) | | | Thanks for the heads up, fellas. I read recently on one of these threads that it's quite a job. Is there a "how to" link on here? Any special tools? Thanks - Ed.
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| | | Leethal | | Zeus | |  | | Reg. Date | : | 24/01/2011 | | Posts | : | 6,404 | | Location | : | Australia |
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| | Posted : 14 Apr 2015 - 21:33 Post title : Re: Spark plugs (Re: edbob) | | | Just a small tip Ed if you don't have the proper gripping spark plug socket and just a normal deep socket. Use a piece of flexible hose that fits snug over the spark plug insulator, makes it easy to start the thread when refitting and also to retrieve the plug from the deep cavity.
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1600,Foran Razorbacks, Meerkat bypass, Dyno tune, real headlight,plenty of chrome,switchblade pegs, Hagon Nitro shocks & Ikon progressive fork springs etc. Scorpion Western Low handlebars. PH adjustable fork caps.
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| | | edbob | | Chaac | | | | Reg. Date | : | 04/04/2012 | | Posts | : | 931 | | Location | : | United States |
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| | Posted : 14 Apr 2015 - 22:32 Post title : Re: Spark plugs (Re: Leethal) | | | One more quick question  - I just got done researching heat ranges - what is the stock recommended heat range? The NGK iridium plugs listed above read as a 7 in the description. The higher the number, the colder the plug, so I'm guessing stock is a 6?
Edit - DPR6EA9 - Heat range 6...
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| | Post edited by edbob on 15 Apr 2015 - 00:26 |
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| | | large | | Set | | | | Reg. Date | : | 22/08/2009 | | Posts | : | 168 | | Location | : | North Tazewell, virgina, United States |
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| | Posted : 15 Apr 2015 - 00:39 Post title : Re: Spark plugs (Re: edbob) | | | Yes 6 is stock I went with colder because I read the color of the plugs and the ceramic was blistered and slightly burnt. I think caused by increased timing form dizzies tune and I do ride in the upper rpm range about 80% of the time. I'll check the color at the next oil change and see how it looks.
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