The Ford Barn

37 Coupe · 02-03-2020, 10:29 PM

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.

Jim Baskin III Pa. · 02-04-2020, 08:12 AM

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

http://www.federalmogul.com/digitala...RangeChart.pdf

katy · 02-04-2020, 12:16 PM

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".

37 Coupe · 02-04-2020, 12:31 PM

I noticed the shorter reach compared to the 3X plugs I have but also different plug gap design.

katy · 02-04-2020, 12:41 PM

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.

dave in australia · 02-06-2020, 01:26 AM

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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.

rotorwrench · 02-06-2020, 09:42 AM

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

02-03-2020, 10:29 PM	#1
37 Coupe Senior Member Join Date: May 2010 Posts: 1,835	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. __________________ "Never complain,never explain"... Henry Ford II

02-04-2020, 08:12 AM	#2
Jim Baskin III Pa. Senior Member Join Date: May 2010 Location: Lock Haven Pa. Posts: 252	Re: Champion W-20 plug 37 Coupe ,they are a industrial plug with a high heat range http://www.federalmogul.com/digitala...RangeChart.pdf

02-04-2020, 12:16 PM	#3
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,042	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". __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn! Last edited by katy; 02-04-2020 at 12:18 PM. Reason: Addition

02-04-2020, 12:31 PM	#4
37 Coupe Senior Member Join Date: May 2010 Posts: 1,835	Re: Champion W-20 plug I noticed the shorter reach compared to the 3X plugs I have but also different plug gap design. __________________ "Never complain,never explain"... Henry Ford II

02-04-2020, 12:41 PM	#5
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,042	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. __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!

02-06-2020, 01:26 AM	#6
dave in australia Senior Member Join Date: May 2010 Location: Victoria, Australia Posts: 1,175	Re: Champion W-20 plug Sponsored Links (Register now to hide all advertisements) 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.

02-06-2020, 09:42 AM	#7
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,425	Re: Champion W-20 plug The shorter reach likely helps keep them from fouling for a oil burner.