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Smart quod bastardus
 
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Join Date: Oct 2002
Location: Baltimore, MD, USA
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turbo spark plugs

Can anyone comment on these plugs and let me know if it looks normal for a turbo or do I have a problem:
Bosch W3DPO standard high dollar plug for the 79 930:

Old 06-20-2007, 07:29 PM
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They look a bit black to me.. but maybe I am seeing more than is really there..
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Old 06-20-2007, 07:59 PM
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Crotchety Old Bastard
 
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Ouch Fred, that bottom one looks pretty nasty. That plug does not look to be functioning.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-21-2007, 05:27 AM
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Too cold a plug. Add to that maybe a little oil getting past the valve guides and some blowby on the rings.

I'd go to a 4 heat range plug and check it again. A leakdown test might help pinpoint if there are other problems.
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Old 06-21-2007, 05:38 AM
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wcc wcc is offline
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The first two pics looked pretty much like mine. Black and sooted. Which is normal. The last pic looks pretty rough to me too.
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Old 06-21-2007, 06:19 AM
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