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Old 05-19-2021, 10:26 AM   #1
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Spark plug gap

I have a 2004 workhorse chassis RV. I saw a post on there about spark plug gap. It was stated that you should use a different gap then Workhorse states and I can not find the posting at all. it was posted Nov 2020. Can someone help? I have a 5.7L gas
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Old 05-19-2021, 03:25 PM   #2
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Quote:
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I have a 2004 workhorse chassis RV. I saw a post on there about spark plug gap. It was stated that you should use a different gap then Workhorse states and I can not find the posting at all. it was posted Nov 2020. Can someone help? I have a 5.7L gas
I would be very suprised to learn you have a small V-8 powering your Chieftain. ASSUMING you have a W-22 series chassis, you have an 8.1L V-8.

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Old 05-19-2021, 05:36 PM   #3
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I agree with Ed, your 2004 Chieftan should be equipped with an 8.1 engine. The revised spark plug gap you mentioned is .045. (45/1000).
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Old 05-20-2021, 04:43 AM   #4
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Jon Brazel posted this in March:

We’ve done a lot of dyno testing and with our Magnum wires, there was absolutely no difference in power between .045 gapped plugs and factory .060 gapped plugs. Removing the resistance in the ignition wire has many benefits! Back when we use to run Taylor wires, the .045 gap worked well but with the Iridium tips being a bit more fragile I recommend leaving them alone at .060.
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Old 05-20-2021, 10:01 AM   #5
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so sorry, I do have a 8.1
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Old 05-20-2021, 10:02 AM   #6
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yes, I do have a 8.1. brain fart on my part
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Old 05-20-2021, 10:04 AM   #7
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you are all right. I have a 8.1, thanks for correcting my Bad
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Old 05-20-2021, 05:35 PM   #8
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Jon Brazel posted this in March:

We’ve done a lot of dyno testing and with our Magnum wires, there was absolutely no difference in power between .045 gapped plugs and factory .060 gapped plugs. Removing the resistance in the ignition wire has many benefits! Back when we use to run Taylor wires, the .045 gap worked well but with the Iridium tips being a bit more fragile I recommend leaving them alone at .060.
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I changed wires and plugs, about a month ago, gapped at 45. Done a 400 mile trip and it run great. Do I need to regap to 60, I used the magnum wires.
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Old 05-20-2021, 10:31 PM   #9
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I changed wires and plugs, about a month ago, gapped at 45. Done a 400 mile trip and it run great. Do I need to regap to 60, I used the magnum wires.
Leave it where it is if you've already done it. I think the risk is in damaging the fragile tips while performing the gap change.
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Old 05-21-2021, 04:48 AM   #10
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Just to add to the discussion, I purchased plugs and Magnum wires from Brazels and left the gap at the factory setting of .060. Engine has run perfectly for 3,000 miles.
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Old 05-21-2021, 04:57 PM   #11
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I replaced my plugs just before I saw this thread and set them at .045". I'm leaving them that way! That was in fact the GM recommendation.
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Old 06-12-2021, 07:02 PM   #12
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how can adjusting the gap mess up the tip ? my cheap gap tool does not come close if USED CORRECTLY.

i surely can change the gap on ANY plug w/o touching the tip, can not any competent person do the same - put on glasses so you can see the details if need be ???1

IMO, a silly notion NOT to change gap if needed, what if NOT set correctly from factory somehow ?


please explain ?


Quote:
Originally Posted by RetiredBob View Post
Jon Brazel posted this in March:

We’ve done a lot of dyno testing and with our Magnum wires, there was absolutely no difference in power between .045 gapped plugs and factory .060 gapped plugs. Removing the resistance in the ignition wire has many benefits! Back when we use to run Taylor wires, the .045 gap worked well but with the Iridium tips being a bit more fragile I recommend leaving them alone at .060.
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Old 06-13-2021, 01:34 AM   #13
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The vast majority of plugs already come pre gapped according to manufacture specs for said vehicle.
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Old 06-13-2021, 05:39 AM   #14
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how can adjusting the gap mess up the tip ? my cheap gap tool does not come close if USED CORRECTLY.

i surely can change the gap on ANY plug w/o touching the tip, can not any competent person do the same - put on glasses so you can see the details if need be ???1

IMO, a silly notion NOT to change gap if needed, what if NOT set correctly from factory somehow ?


please explain ?
It's not needed. Did you not read the part about there being no difference in power?
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