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srfndoc
Samba Member
Joined: August 21, 2010
Posts: 3274
Location: SoCal
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 Posted: Mon Feb 06, 2023 3:31 pm Post subject: Odd buildup on spark plug |
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Recently pulled my plugs after a long trip as it was running rough with less power. These were put in before my time so not sure how long they were in for and whether or not they used anti-seize (I'm guessing they did). What would cause the buildup on the ground electrode?
The other thing I noticed is the plugs seemed very loose, almost hand tight but they were not stripped and I had no issues putting another set in. Would the combination of being loose and anti-seize present cause the buildup? Something else?
I have not used these plugs before and put in my last set of Bosch W8AC's in (practially antiques now) and it seems to be running better after also fixing a few other items:
-Points gap closed up
-Belt loose (recently changed a few 100 miles ago)
Set the points gap properly, re-timed it with a timing light for 30 degrees all in (009 dizzy with H30/31) and its running pretty good now. The W8AC's are a little hotter than the previous plugs (NGK B6HS) so maybe that contributed as well (bone stock sp1600)?
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RPM=(MPH*336* (R&P*4th*1.26))/Tire Diameter in inches |
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mukluk
Samba Member
Joined: October 18, 2012
Posts: 7023
Location: Clyde, TX
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| Posted: Mon Feb 06, 2023 4:07 pm Post subject: Re: Odd buildup on spark plug |
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Hard to tell for certain what the deposits are on the electrodes. It looks like ash to me, possibly from running the cooler heat range plugs, or possibly from bottles of additives in your fuel if you use them.
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madmike
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Joined: July 11, 2005
Posts: 5292
Location: Atlanta,Michigan
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| Posted: Mon Feb 06, 2023 4:23 pm Post subject: Re: Odd buildup on spark plug |
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cheap Ca. fuel 
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'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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srfndoc
Samba Member
Joined: August 21, 2010
Posts: 3274
Location: SoCal
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| Posted: Mon Feb 06, 2023 4:40 pm Post subject: Re: Odd buildup on spark plug |
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Don't use any fuel additives and yes, the fuel sucks here in CA but I'm always running premium (92 octane).
It's possible I got some shit gas on the trip as I think it really didn't start running poorly until after my last fill up on the way back.
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Bruce Amacker
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Joined: December 26, 2007
Posts: 1786
Location: Cleveland, Ohio
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