 Is this the correct spark plug?, NGK B5ES?? |
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| porschefile2010 |
 May 12 2015, 08:24 PM
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#1
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Member  Group: Members Posts: 228 Joined: 26-May 11 From: Whangaparaoa, New Zealand Member No.: 13,118 Region Association: Australia and New Zealand  |
Hi. I just went to clean my plugs to see if my retuning had made the car run a little leaner and had a look in the Haynes manual for the correct gap.
When I finally found it I noticed that the manual says there are two different plug specs, one for 1975 ( which mine is ) and one for the rest. It seems I should be running a Bosch 175M30 or equivalent, so down here a Champion N9YC which I presume is slightly longer. I have searched for a thread on this but can't find anything. Any ideas? And do you think it will be ok to fit a N9YC/ Thanks Richard |
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| JawjaPorsche |
May 13 2015, 03:40 AM
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#2
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Advanced Member Group: Members Posts: 3,463 Joined: 23-July 11 From: Clayton, Georgia Member No.: 13,351 Region Association: South East States |
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| JFJ914 |
May 13 2015, 09:23 AM
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Senior Member Group: Benefactors Posts: 813 Joined: 13-June 03 From: Alpharetta, GA Member No.: 814 Region Association: South East States 
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Stock plug was Bosch W7CC, Optional NGK B6ES. Three Quarter inch reach, no extended tip.
HTH |
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| jim_hoyland |
May 13 2015, 01:09 PM
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Get that VIN ? Group: Members Posts: 9,289 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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QUOTE(John Jentz @ May 13 2015, 08:23 AM)  Stock plug was Bosch W7CC, Optional NGK B6ES. Three Quarter inch reach, no extended tip. HTH Good info (IMG:style_emoticons/default/smile.gif) what about '75 vs the earlier years ? I have a '75 and didn't realize any difference ? And why would they be different ? |
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| porschefile2010 |
May 13 2015, 03:32 PM
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#5
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Member Group: Members Posts: 228 Joined: 26-May 11 From: Whangaparaoa, New Zealand Member No.: 13,118 Region Association: Australia and New Zealand |
So that was my point as much as anything. Why would the Haynes manual specify a distinctly different plug for the 75 engines.
I went and purchased a set of Champion equivalents to the Bosch plug ( Champion N9YC ) and while the thread was the same length it seemed the tip of the plug was a few mm longer. So might this have been to do with a different piston or different head design for that year. I notice it was only for 75 US cars as well. |
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