 spark plug question for a six |
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| rfuerst911sc |
 Jan 1 2011, 08:05 AM
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#1
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Advanced Member  Group: Members Posts: 2,158 Joined: 4-May 06 From: Dahlonega , Georgia Member No.: 5,980 Region Association: South East States  |
I just ordered some Clewett spark plug wires for the six and I'm going to change the plugs at the same time. Ignition rotor and cap are only 6 months old. Engine is a stock internal 3.0 with Weber carbs and Mallory multi spark ignition. All my records are still in moving boxes and I haven't pulled the old ones yet so what are the recommended plugs/heat ranges for street driving ? I generally like NGK standard copper plugs but have run copper Bosch in the past. Thanks and happy new year (IMG:style_emoticons/default/beerchug.gif) .
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| Cap'n Krusty |
Jan 3 2011, 08:32 PM
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Reality check!
Early 3.0 engines used one plug, late engines used another. Carbs, especially with "modern" fuels, need a hotter plug than is specified for CIS engines. "R" is for resistor, and most new plugs have that feature. Bosch uses the ":C" designation for non-extended tip, "D" for extended. NGK uses "P" for extended tip, no letter at all for standard tip. A "cold" plug transfers heat away from the tip faster than a "hot" plug. 911s have traditionally run non extended tip plugs. PMO advises running the hottest plug you can get, more or less, and they know quite a bit about 911s with carbs. The book calls for them. However, at some point they changed, probably with the 3.2. The Cap'n |
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| rfuerst911sc |
Jan 4 2011, 04:44 PM
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#3
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Advanced Member Group: Members Posts: 2,158 Joined: 4-May 06 From: Dahlonega , Georgia Member No.: 5,980 Region Association: South East States |
QUOTE(Cap'n Krusty @ Jan 3 2011, 06:32 PM)  Reality check! Early 3.0 engines used one plug, late engines used another. Carbs, especially with "modern" fuels, need a hotter plug than is specified for CIS engines. "R" is for resistor, and most new plugs have that feature. Bosch uses the ":C" designation for non-extended tip, "D" for extended. NGK uses "P" for extended tip, no letter at all for standard tip. A "cold" plug transfers heat away from the tip faster than a "hot" plug. 911s have traditionally run non extended tip plugs. PMO advises running the hottest plug you can get, more or less, and they know quite a bit about 911s with carbs. The book calls for them. However, at some point they changed, probably with the 3.2. The Cap'n Cap'n what plug would you recommend ? I did know that early ( 78-79 ) used a different plug then late ( 80-83 ) but I don't know if that is just for the CIS cars ? To your point I'm running carbs on both engines. |
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Posts in this topic
rfuerst911sc spark plug question for a six Jan 1 2011, 08:05 AM
J P Stein BP6es should be close. It takes a bit of fooling a... Jan 1 2011, 08:50 AM Joe Sharp :agree: Tottaly... Jan 1 2011, 01:04 PM carr914 :agree: :beer2: Jan 2 2011, 04:22 AM rfuerst911sc Any advantage to use the BPR6ES vs. B96ES ? I assu... Jan 2 2011, 04:43 AM J P Stein I don't know. I collected a good size box of t... Jan 2 2011, 08:49 AM ME733 ...I wish their was an absolutely clear deffinatio... Jan 2 2011, 09:48 AM
ME733
Reality check!
Early 3.0 engines used one pl... Jan 4 2011, 09:27 AM Cap'n Krusty Well, that's Champion, a plug virtually no Ger... Jan 4 2011, 09:48 AM
ME733
Well, that's Champion, a plug virtually no Ge... Jan 4 2011, 10:06 AM Cap'n Krusty Well, I disagree with you, and I've been worki... Jan 4 2011, 03:33 PM ME733
Well, I disagree with you, and I've been work... Jan 5 2011, 09:13 AM Joe Sharp I use NGK's on every thing I can. I like them ... Jan 4 2011, 04:09 PM |
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