spark plug puck
Thread Starter
Safety Car
Joined: May 2002
Posts: 4,010
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From: Somewhere nowhere
spark plug puck
I'm changing plugs on my LT4, and I notice one of the old plugs is missing the puck, and the gap is .60 rather than .50
also, the plug had a whitish coating on the ground, probably a result of the missing puck.
definately glad I pulled the plugs on a 30,000 mile car....
also, the plug had a whitish coating on the ground, probably a result of the missing puck.
definately glad I pulled the plugs on a 30,000 mile car....
Team Owner
Joined: Dec 1999
Posts: 34,873
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
NGK plugs work great on the LTx motors. I used the NGK Iridium plug on my 92 and saw a 2MPG increase in fuel limeage and a much smoother idle.The AC Delco platinum plugs were famous for losing the little puck. When I pulled the OEM plugs out, the car only had 38K miles and only 1 of the 8 plugs still had the puck.
Drifting
Joined: Sep 2003
Posts: 1,363
Likes: 7
From: 1994 LT1 Coupe 6-speed with FX3 & 2000 LS1 Vert 6-Speed with F45 Hunterdon County, NJ
NGK plugs work great on the LTx motors. I used the NGK Iridium plug on my 92 and saw a 2MPG increase in fuel limeage and a much smoother idle.The AC Delco platinum plugs were famous for losing the little puck. When I pulled the OEM plugs out, the car only had 38K miles and only 1 of the 8 plugs still had the puck.
, our 94's had 2 AC/Delco's missing their pucks (only 20k on them). Also went with NGK Iridium.C4cruiser, I went with a gap on our NGK's @ 0.050-0.051 (car spec and per NGK tech support), what did you set yours at?
Last edited by theadmiral94; Oct 11, 2007 at 06:26 PM.
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From: Greenwood Indiana
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Can someone show a pic or a link of a plug w/ and w/o the puck. My ignorance, but I'm not clear on what a puck is.
Drifting
Joined: Sep 2003
Posts: 1,363
Likes: 7
From: 1994 LT1 Coupe 6-speed with FX3 & 2000 LS1 Vert 6-Speed with F45 Hunterdon County, NJ
puck: a small soldered piece of platinum on the inside edge of the ground electrode, designed to be the place where the spark jumps too when arcing from the center electrode. imagine that the 'puck' is directly across from the center electrode, so when gapping the plug, the feeler gauge will go between the 'puck' and the center electrode.
Hence why when they fall off (bad soldering, overheat melting the puck, etc) the gap jumps from 0.050 to 0.065.
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Last edited by Blownfuel1; Oct 12, 2007 at 01:38 AM.
