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  #11  
Old 07-17-2012, 06:26 PM
dusterman dusterman is offline
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can you run colder pulgs all the time or do you have to change them everytime your not running boost whats the long term on just running cold plugs.
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  #12  
Old 07-17-2012, 07:15 PM
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Your stock intake plug is 92174, same as the Hemi. The good one range colder plug for that is 7787 or 3672 (can't see a difference between these two)

Exhaust stock plug is 97606, a double platinum plug. Should be able to use the 5987 for those!

This would take you from heat range 5 up to heat range 6 on both and they have all the same specs as the stockers, just one step colder!

You can go on ngk.com and put the plug part numbers in to compare all the specs.

Last edited by 916Timmy; 07-17-2012 at 07:28 PM.
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  #13  
Old 07-18-2012, 08:29 AM
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Quote:
Your stock intake plug is 92174, same as the Hemi. The good one range colder plug for that is 7787 or 3672 (can't see a difference between these two)

Exhaust stock plug is 97606, a double platinum plug. Should be able to use the 5987 for those!

This would take you from heat range 5 up to heat range 6 on both and they have all the same specs as the stockers, just one step colder!

You can go on ngk.com and put the plug part numbers in to compare all the specs.
Are you sure? Where'd you get that info?

I didn't check the info you posted but these are the stock plugs (bosch) from what I've found:

Intake:
Part # FR8TE2
Yttrium enhanced for longer performance life
Also says it has 2 ground electrodes
Center Electrode Core Material: Nickel-Yttrium and Copper
Center Electrode Tip Material: Nickel-Yttrium
Ground Electrode Tip Material: Nickel-Yttrium and Copper

Exhaust:
Part # FR8TI332
Center Electrode Tip Material: Iridium
Ground Electrode Tip Material: Nickel-Yttrium
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  #14  
Old 07-18-2012, 08:36 AM
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Quote:
can you run colder pulgs all the time or do you have to change them everytime your not running boost whats the long term on just running cold plugs.
You don't have to change them. Hotter plugs clean themselves better, and I think are better for emissions. If you go one heat range colder you won't experience any problems. If you were to jump say 4 heat ranges you might have some issues with the plugs not cleaning themselves well and fouling easily. Sometimes too hot of a plug can also cause preignition(usually on air cooled engines, not liquid cooled).

For example on my buell the cylinder head temp gets as hot as about 450 deg F, and with the stock plugs when it would get that hot(sitting in traffic, etc.) it would sometimes preignite. The plug retains so much heat that it gets so hot where it causes the compressed air/fuel to combust before the plug actually fires. I changed to the same plugs one heat range colder and it stopped doing that.

This usually doesn't happen with liquid cooled engines since the temperature is maintained better within a certain range, the plug doesn't get extremely hot like that and cause a hot spot for ignition.

A colder plug simply has less insulation around it's core(so it can transfer heat faster away through it's body and into the cylinder head).
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  #15  
Old 07-18-2012, 10:50 AM
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So is what 916Timmy said correct? will those plugs work?
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  #16  
Old 07-18-2012, 10:53 AM
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Quote:
Originally Posted by snrusnak View Post
I'm not sure that that is correct. Also, keep in mind that's only one plug, you have two per cylinder, and they are different plugs. Going from memory, I think the one you posted there(the bosch nickel yttrium) is intake side, and the exhaust side is a bosch iridium plug.
so now we need an exhaust plug? should be good to go if i can find one.
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  #17  
Old 07-18-2012, 11:19 AM
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hold on a second..........I'm not sure we have the intake side down yet...

OEM intake plug is Bosch FR8TE2. What plug did you come up with that is the same plug but one heat range colder?
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  #18  
Old 07-18-2012, 11:43 AM
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This is what i have

OEM plug. http://www.summitracing.com/parts/BCH-FR8TE2/

Colder plug. http://www.summitracing.com/parts/NGK-2460/

916Timmy http://www.summitracing.com/parts/NGK-7787/
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  #19  
Old 07-18-2012, 11:45 AM
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Difference between mine and his is the heat range.
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  #20  
Old 07-18-2012, 01:48 PM
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The reach between the two NGK's you posted is actually different. Timmy's NGK plug has a reach that matches the OEM Bosch plug. The other NGK plug that you show is a different reach from OEM(not sure if this matters).

Also, they might be a suitable replacement(not really sure honestly) but they do not appear to be "yttrium enhanced". I'm not even really sure what the yttrium even does, I think it might just be for longevity and have nothing to do with performance.

I'm trying to help but honestly don't have "the answer". A plug like one of those NGK's might be a suitable replacement(not really sure), but it is NOT the same as an OEM plug that is one heat range colder. Again, I know that's not an answer, but it's all I know lol.

EDIT: Also, another difference between the OEM Bosch intake plug is that it says it has two ground electrodes and the NGK I believe does not. Again, not really sure if this makes a difference.
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