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Plugs - What a diff!
On the left is a Bosch W7DTC 3-electrode plug with about 5000 miles on it. On the right is an NGK BPR6ES (copper) with about 5000 miles on it. The Bosch showed some caked on carbon which you can't see here very well. The NGKs had no carbon on the electrodes at all. (the black on the NGK electrode is dirt/grime from removing).
Quite a difference , yes? The only other variables were that I replaced my rotor and cap when I installed the NGKs. ![]() Would you say that the main difference is a better spark due to new cap and rotor? Or are the single electrode plugs just a way better plug?
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-Steve '87 Carrera Targa Last edited by Steve87-911; 08-28-2005 at 07:48 PM.. |
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I use NGK's in every car I own. They are the best plug IMHO.
Mike
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'77 911 3.0 '94 Mustang GT '77 911 (soon be a real live racecar!) |
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Re: Plugs - What a diff!
Quote:
You can correct the problem though by cleaning up and regapping the Bosch plugs and putting them in for another 5000 miles, and THEN comparing them to the NGK's.
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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Back in the 80's when I used to work on the line, I couldn't tell you how many problem cars came in with ign problems. It would always boil down to people installing plat plugs. These cars were made for copper plugs. Install the Bosch Super plugs and you'll notice how good they work.
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Armando Diaz 85 911 Carrera - Track car 01 996 Carrera - For Sale http://forums.pelicanparts.com/showthread.php?s=&threadid=327823&highlight=996 87 944na - Old Daily Driver, now 944 CUP 03 Chevy Avalanche- Support Vehicle 70 Olds 442 W30 Conv- Gone but not forgotten http://www.diazracing.com adiaz@diazracing.com |
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Excellent picture, thanks.
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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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No prob.
I wouldn't normally change my plugs so often but since I have to do my smog test this week, I didn't want to take any chances.
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-Steve '87 Carrera Targa |
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Those two plugs have different heat ranges, right? that might have something to do with it. Maybe the one on the left was too cold. Anyone?
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Good point about the heat ranges. In order for the comparison to be meaningful, both plugs have to be of comparable heat ranges.
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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Those plugs have the same heat range.
Mike
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'77 911 3.0 '94 Mustang GT '77 911 (soon be a real live racecar!) |
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Quote:
and NGK BP6ES is one step colder than plugs for rich carbs. Meaning I ran BP7&8 ES with CIS.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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