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Old 02-03-2020, 10:29 PM   #1
37 Coupe
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Default Champion W-20 plug

Would a Champion W-20 plug be a good runner in a Model A engine that probably has seen better days,probably needs at least rings and valve job,never bored. I have 4 W-20 that came with it.Thank You. Also have the 3X plugs.
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Old 02-04-2020, 08:12 AM   #2
Jim Baskin III Pa.
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Default Re: Champion W-20 plug

37 Coupe ,they are a industrial plug with a high heat range

http://www.federalmogul.com/digitala...RangeChart.pdf
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Old 02-04-2020, 12:16 PM   #3
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Default Re: Champion W-20 plug

I have Champion W-18 plugs in my CCPU and they run fine. The chart that Jim B linked to shows they have a heat range of 7 which is the same as it shows for the W-20 plug, although the W-18 has a reach of 3/4" while the W-20 has a reach of 5/8".
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Last edited by katy; 02-04-2020 at 12:18 PM. Reason: Addition
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Old 02-04-2020, 12:31 PM   #4
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Default Re: Champion W-20 plug

I noticed the shorter reach compared to the 3X plugs I have but also different plug gap design.
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Old 02-04-2020, 12:41 PM   #5
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Default Re: Champion W-20 plug

The modern 3X plugs are a reproduction of the old ones and have the "bent wire" ground electrode which is designed to drain any oil accumulation away from the gap. The oil accumulation occurs in old, tired engines, aka oil burners.
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Old 02-06-2020, 01:26 AM   #6
dave in australia
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Default Re: Champion W-20 plug

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I use W-20's and have never had a problem with them. The engine in my Tudor was getting on a bit, and would get a bit fumy when hauling up a long climb, but the plugs never fouled.
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Old 02-06-2020, 09:42 AM   #7
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Default Re: Champion W-20 plug

The shorter reach likely helps keep them from fouling for a oil burner.
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