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Registered
Join Date: Nov 2008
Posts: 44
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spark plug gap
does anyone know the right gap on a 77 911s targa with a 2.7 engine i am using ngk plugs , i got the thinging running now atleast. But i still have a little miss, i changed the plugs, points, rotor and cap the wires look new so i didnt replace them. I dont know how long the cars been sitting so i put acouple cans of sea form in the tanks to clean the system out plus replaced the fuel system, i installed the plugs right out of the box cause i couldnt find the right gap in my manual for the ngk plugs, also i set the points at 14 thanks for any info
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02-01-2009, 06:58 PM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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Quote:
If they short out, they're junk. Last edited by stlrj; 02-02-2009 at 07:31 PM.. |
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02-02-2009, 02:25 AM
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Registered
Join Date: Mar 1999
Location: Cornwall-on-Hudson, New York, USA
Posts: 4,499
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Or watch them in the dark with the engine running.
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Stephan Wilkinson '83 911SC Gold-Plated Porsche '04 replacement Boxster |
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02-02-2009, 06:05 AM
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Join Date: Jan 2006
Location: Santa Barbara, CA
Posts: 2,307
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i use the stock out of the box gaps on my ngks. Doubt this is the source of a miss problem.
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jhtaylor santa barbara 74 911 coupe. 2.7 motor by Schneider Auto Santa Barbara. Case blueprinted, shuffle-pinned, boat-tailed by Competition Engineering. Elgin mod-S cams. J&E 9.5's. PMO's. 73 Targa (gone but not forgotten) |
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02-02-2009, 06:52 AM
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Make My Day
Join Date: May 2003
Location: Northern NY
Posts: 1,305
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Plug Gap: 0.55mm/0.022in
You don't always get a straight answer here. 
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74 911S Targa ROW Building Designer/Business Owner |
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02-02-2009, 09:06 AM
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Join Date: Mar 2008
Location: Thousand Oaks, California
Posts: 367
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You didn't ask, but after gapping your plugs with a proper gauge, be careful when you insert them in the motor. It very easy to "bonk" them on the way to the hole, effectively closing the gap.
If you set the points to "14," a dwell tach would be a great tool to set them more accurately. All good advice on the plug wires. Sometimes it's not one specific thing that makes a motor "miss." It's a combo of several small things. |
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02-02-2009, 09:35 PM
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