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Old 12-28-2005, 10:32 AM   #1
Coyote
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Default Spark Plug Heat Range Chart

This is a spark plug heat range chart that has worked well for me; hopefully you will find it useful as well. The chart is not is not vehicle/engine specific. To use it, simply look up your factory spark plug (sorry, Auto light plugs only) and then go hotter or colder (depending on your use). For example; a stock Jeep 4.0 engine uses plug number 985. Iím getting a lot of fouling, so I went one step hotter; plug # 3926. When you go to your favorite auto parts store, donít bother trying to tell them what vehicle itís for or what you are trying to do. Most of the parts counter people wonít have any idea what youíre talking about or tell you that it canít be done. Just give them the Autolite part number or ask for an equivalent in your favorite brand. The chart works best if you print it out and then try to read it. Unless you have eagle eyes.

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í91 XJ bone stock - why change a perfect thing?

There is no such thing as driver error, only parts failure.

Last edited by Coyote; 12-28-2005 at 10:43 AM. Reason: fixed now.
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Old 12-28-2005, 10:34 AM   #2
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Default Re: Spark Plug Heat Range Chart

Quote:
Originally Posted by Coyote
This is a spark plug heat range chart that has worked well for me; hopefully you will find it useful as well. The chart is not is not vehicle/engine specific. To use it, simply look up your factory spark plug (sorry, Auto light plugs only) and then go hotter or colder (depending on your use). For example; a stock Jeep 4.0 engine uses plug number 985. Iím getting a lot of fouling, so I went one step hotter; plug # 3926. When you go to your favorite auto parts store, donít bother trying to tell them what vehicle itís for or what you are trying to do. Most of the parts counter people wonít have any idea what youíre talking about or tell you that it canít be done. Just give them the Autolite part number or ask for an equivalent in your favorite brand. The chart works best if you print it out and then try to read it. Unless you have eagle eyes.

Coyote
Is there supposed to be an attachement of link for this?
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Old 12-28-2005, 10:38 AM   #3
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Default Re: Spark Plug Heat Range Chart

Yep, having issues with the attachment. Trying to work it now.

I had to drop the quality quite a bit to get the image to post. If you are having problems reading the chart after you print it out, PM me and Iíll email you the original file.

Coyote
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í91 XJ bone stock - why change a perfect thing?

There is no such thing as driver error, only parts failure.

Last edited by Coyote; 12-28-2005 at 10:43 AM. Reason: Fixed now.
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Old 12-30-2005, 12:31 AM   #4
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Default Re: Spark Plug Heat Range Chart

E-mail it to me and I will post it big.
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Old 12-30-2005, 12:37 AM   #5
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Default Re: Spark Plug Heat Range Chart

Email sent to you.
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í91 XJ bone stock - why change a perfect thing?

There is no such thing as driver error, only parts failure.
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