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Registered
Join Date: Jul 2005
Location: southern RI USA
Posts: 1,513
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Spark plug gap question
Hello
Changing the plugs yesterday, I noticed that the manual specifies plug gap of 0.024. The WR5DC+ plugs (recommended by PP and others) have a gap of ~0.032. I assume this is acceptable or that a note to re-gap plugs before installation would be made somewhere... Stock 2.2t engine with bosch distributor/crane ignition, if that helps. One of the old NGKs I pulled out had a badly cracked insulator. Yikes.
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Sepia brown 1971 911T. |
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08-20-2007, 04:59 AM
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Bug Eating Member
Join Date: Jul 2007
Location: A swamp near you
Posts: 2,068
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I would use the factory spark plug gap specs unless your car has an MSD box instead of the factory CDI box.
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08-20-2007, 05:35 AM
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Regis turd ab user
Join Date: Dec 2006
Location: Tacomatose, Wa USA
Posts: 1,489
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.028 - .032 should do you fine, NGK BP6ES or BP7ES depending on your operating conditions.
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08-20-2007, 05:57 AM
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Mine are supposed to be .028, I have them at .035" and love it. No more gas smell at idle and no little backfires when letting off the gas.
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1977 911S Targa 2.7L (CIS) Silver/Black 2012 Infiniti G37X Coupe (AWD) 3.7L Black on Black 1989 modified Scat II HP Hovercraft George, Architect |
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08-20-2007, 06:54 AM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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With an upgrade to an HEI distributor cap/ ignition cables, my 86 3.2 has no problem firing a 0.060" gap.
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08-20-2007, 07:33 AM
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Quote:
Hows that working for you? I still have the bookmark somewhere.
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1977 911S Targa 2.7L (CIS) Silver/Black 2012 Infiniti G37X Coupe (AWD) 3.7L Black on Black 1989 modified Scat II HP Hovercraft George, Architect |
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08-20-2007, 07:43 AM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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That's right. An HEI Jeep Cerokee cap and rotor.
I have to admit that it's probably the most reliable ignition upgrade that I have ever had on my 911. Seems like I never have to worry about ignition issues ever again even after degreasing/hosing it off, it never skips a beat. Nothing like having the reliability of a domestic with the performance of an exotic. Whoever said "you can't have your cake...."? Cheers, Joe Last edited by stlrj; 08-21-2007 at 06:27 AM.. |
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08-21-2007, 06:17 AM
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Registered
Join Date: Aug 2003
Location: RI
Posts: 901
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So your using the coil pac built into the cap?
I did this method on my 87 Wangler using a GM HEI. Sounds like a nice upgrade for the Porsche.
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Silver 1980SC Euro coupe |
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08-21-2007, 10:55 AM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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Quote:
Sorry for the dirty engine, but as you can see this was before I installed the waterproof HEI cap. Now I don't worry about hosing my engine when I degrease it like I do on my domestic cars.      HEI cables     Water cooling. Last edited by stlrj; 08-21-2007 at 02:59 PM.. |
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08-21-2007, 02:34 PM
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1977 Porsche 911S 2.7L
