Spark Plug Heat Range Chart

Coyote · 12-28-2005, 09:32 AM

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. I’m getting a lot of fouling, so I went one step hotter; plug # 3926. When you go to your favorite auto parts store, don’t bother trying to tell them what vehicle it’s for or what you are trying to do. Most of the parts counter people won’t have any idea what you’re talking about or tell you that it can’t 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

Little Giant · 12-28-2005, 09:34 AM

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. I’m getting a lot of fouling, so I went one step hotter; plug # 3926. When you go to your favorite auto parts store, don’t bother trying to tell them what vehicle it’s for or what you are trying to do. Most of the parts counter people won’t have any idea what you’re talking about or tell you that it can’t 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?

Coyote · 12-28-2005, 09:38 AM

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 I’ll email you the original file.

Coyote

Logjam · 12-29-2005, 11:31 PM

E-mail it to me and I will post it big.

Coyote · 12-29-2005, 11:37 PM

Email sent to you.

12-28-2005, 09:32 AM	#1
Coyote Registered Member Join Date: May 2005 Location: Face of the sun Posts: 370	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. I’m getting a lot of fouling, so I went one step hotter; plug # 3926. When you go to your favorite auto parts store, don’t bother trying to tell them what vehicle it’s for or what you are trying to do. Most of the parts counter people won’t have any idea what you’re talking about or tell you that it can’t 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 Attached Images __________________ ’91 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 09:43 AM. Reason: fixed now.

12-28-2005, 09:38 AM	#3
Coyote Registered Member Join Date: May 2005 Location: Face of the sun Posts: 370	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 I’ll email you the original file. Coyote __________________ ’91 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 09:43 AM. Reason: Fixed now.

12-29-2005, 11:37 PM	#5
Coyote Registered Member Join Date: May 2005 Location: Face of the sun Posts: 370	Re: Spark Plug Heat Range Chart Email sent to you. __________________ ’91 XJ bone stock - why change a perfect thing? There is no such thing as driver error, only parts failure.

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