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Max Welton
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Joined: May 19, 2003
Posts: 11092
Location: Black Forest, CO
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DesertSasquatchXploration
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Joined: April 16, 2021
Posts: 997
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 Posted: Sun Jun 01, 2025 3:25 pm Post subject: Re: Spark Plug Heat Ranges |
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It will run like crap and misfire. Cold plug's are for High CR Or boost engines.
Plugs need to match the engine build. They are not used to correct tuning issues. 5 heat range might melt on ACVW 6 is a good range. I'm going to try a 7 on my new top end with 9:1 CR but its probably to cold.
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Key is to have downward travel Preload keep both wheels on the ground at all times once you lift a tire your DONE. Guys worry about clearance instead think of the opposite you want the suspension to drop that tire in the hole and keep you going. A spider for example they keep their body low but their legs can reach pretty far so they don't (bottom out)
Last edited by DesertSasquatchXploration on Sun Jun 01, 2025 3:50 pm; edited 1 time in total |
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Max Welton
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Joined: May 19, 2003
Posts: 11092
Location: Black Forest, CO
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daveblank
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Joined: November 07, 2024
Posts: 169
Location: Dallas, TX
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| Posted: Sun Jun 01, 2025 6:59 pm Post subject: Re: Spark Plug Heat Ranges |
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| Max Welton wrote: |
I'm not trying to cure a problem. My choice of heat-range was pretty much a wag to begin with. Just wondering what I could expect from stepping up or down one number. I assume your input was directed at going too cold. What about going up in heat (numerically lower with NGKs) one number?
Max |
If you go to a hotter plug than you need it could lead to the engine running hotter or some pre-ignition. If yours are good, I would leave them.
1 question on how you're reading your plugs. Are you doing an actual "plug chop" or are you simply pulling them out after normal driving. Everybody does it differently, I was taught the chop so that's how I do it. |
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Max Welton
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Joined: May 19, 2003
Posts: 11092
Location: Black Forest, CO
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halfassleatherworks
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Joined: December 09, 2018
Posts: 808
Location: Reno NV
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| Posted: Mon Jun 02, 2025 9:04 am Post subject: Re: Spark Plug Heat Ranges |
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| daveblank wrote: |
| Max Welton wrote: |
I'm not trying to cure a problem. My choice of heat-range was pretty much a wag to begin with. Just wondering what I could expect from stepping up or down one number. I assume your input was directed at going too cold. What about going up in heat (numerically lower with NGKs) one number?
Max |
If you go to a hotter plug than you need it could lead to the engine running hotter or some pre-ignition. If yours are good, I would leave them.
1 question on how you're reading your plugs. Are you doing an actual "plug chop" or are you simply pulling them out after normal driving. Everybody does it differently, I was taught the chop so that's how I do it. |
Your reference to "plug chop" Is that in reference to doing a full power pull and then killing the Eng. to get a true look at how the plug is doing?? |
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67rustavenger
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Joined: February 24, 2015
Posts: 11259
Location: Oregon
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| Posted: Mon Jun 02, 2025 10:17 am Post subject: Re: Spark Plug Heat Ranges |
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| halfassleatherworks wrote: |
| daveblank wrote: |
| Max Welton wrote: |
I'm not trying to cure a problem. My choice of heat-range was pretty much a wag to begin with. Just wondering what I could expect from stepping up or down one number. I assume your input was directed at going too cold. What about going up in heat (numerically lower with NGKs) one number?
Max |
If you go to a hotter plug than you need it could lead to the engine running hotter or some pre-ignition. If yours are good, I would leave them.
1 question on how you're reading your plugs. Are you doing an actual "plug chop" or are you simply pulling them out after normal driving. Everybody does it differently, I was taught the chop so that's how I do it. |
Your reference to "plug chop" Is that in reference to doing a full power pull and then killing the Eng. to get a true look at how the plug is doing?? |
Short answer, Yes you are correct.
Do a full throttle pull and shut the engine off and coast to the side of the road pull some plugs to see what the plugs look like.
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I have learned over the years.
Cheap parts are gonna disappoint you.
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Don't let your bad ideas remain, ideas! |
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daveblank
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Joined: November 07, 2024
Posts: 169
Location: Dallas, TX
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| Posted: Mon Jun 02, 2025 12:11 pm Post subject: Re: Spark Plug Heat Ranges |
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| halfassleatherworks wrote: |
| daveblank wrote: |
| Max Welton wrote: |
I'm not trying to cure a problem. My choice of heat-range was pretty much a wag to begin with. Just wondering what I could expect from stepping up or down one number. I assume your input was directed at going too cold. What about going up in heat (numerically lower with NGKs) one number?
Max |
If you go to a hotter plug than you need it could lead to the engine running hotter or some pre-ignition. If yours are good, I would leave them.
1 question on how you're reading your plugs. Are you doing an actual "plug chop" or are you simply pulling them out after normal driving. Everybody does it differently, I was taught the chop so that's how I do it. |
Your reference to "plug chop" Is that in reference to doing a full power pull and then killing the Eng. to get a true look at how the plug is doing?? |
Yes, kill the engine while still under power. It's a pain to pull over & pull a plug though.
Last edited by daveblank on Mon Jun 02, 2025 2:42 pm; edited 1 time in total |
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runamoc 
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Joined: June 19, 2006
Posts: 6230
Location: 37.5N 77.1W
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| Posted: Mon Jun 02, 2025 1:14 pm Post subject: Re: Spark Plug Heat Ranges |
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from my research, the 'curved' electrode will tell you if you have the right heat range. If lower half of that electrode closes to the threads is tan and the rest is black you have the right heat range plug.
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