[T3] Spark Plug Life...

Keith Park topnotch at nycap.rr.com
Mon Dec 12 17:56:13 PST 2016

Wow, those look like mark10 plugs!  Id have expected them to look much worse
with stock kettering at 60K.  at 15K mine have looked about like that, crisp
edges of center electrode worn off but otherwise looking good.


Topnotch Restorations
topnotch at nycap.rr.com
71 Squareback  "Hothe"
65 Notchback  "El Baja Rojo"
93 RX7  "Redstur"
87 Golf  "Winterat" RIP
01 Sentra SE "Boremobile"
-----Original Message-----
From: type3-vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org]
On Behalf Of John Jaranson
Sent: Sunday, December 11, 2016 8:24 PM
To: type3 at vwtype3.org
Subject: Re: [T3] Spark Plug Life...

On Nov 14, 2016, at 11:15 PM, John Jaranson wrote:

> On Nov 14, 2016, at 11:04 PM, Keith Park wrote:
>> 65K!  WOW John!
>> Generally, in the old days, 15K you replaced the plugs.
>> The GM HEI ignitions systems would jump quite the gap and wore the plugs
>> down to what Jim described and still ran at 60Kmi or so.
>> John, send us a picture of your "Worn knubs" when you get them out.
>> :-)
> I plan to document the whole process.  I will be sure include pictures of
what I find as I go through it.

I pulled Sophy's engine yesterday in preparation her freshening over the
winter.  I pulled the spark plugs and took some pictures.  These are Bosch
W8AC plugs with over 60,000 miles on them.  3/4 side look really good.  1/2
are a bit more sooted up but the electrodes themselves look fine.  All the
gaps were still good.  Sophy's rough running is likely explained by whatever
is causing the poor combustion on the 1/2 side. Further investigation is

Here is a link to a picture showing each of the plugs....


I am definitely impressed with the Bosch plugs....not even close to being
"worn knubs"

BTW, Sophy is running standard point ignition with a stock black 12V coil.
Nothing special on that side of things.

John Jaranson

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