Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered
 
Join Date: May 2004
Location: Snohomish County WA
Posts: 691
Garage
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?

__________________
-Steve

'87 Carrera Targa

Last edited by Steve87-911; 08-28-2005 at 07:48 PM..
Old 08-28-2005, 07:44 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered
 
Join Date: Apr 2005
Location: Olympia, WA
Posts: 236
I use NGK's in every car I own. They are the best plug IMHO.

Mike
__________________
'77 911 3.0
'94 Mustang GT
'77 911 (soon be a real live racecar!)
Old 08-28-2005, 09:51 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered
 
jluetjen's Avatar
 
Join Date: Oct 2001
Location: Westford, MA USA
Posts: 8,852
Garage
Re: Plugs - What a diff!

Quote:
Originally posted by Steve87-911

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?
Unfortunately, from a design of experiments perspective you messed things up by replacing the cap and rotor, so there is no way to tell what the cause was. If the rotor and cap were worn, it could very likely have changed the spark to the level where it would cause what you see.

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.
__________________
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
Old 08-29-2005, 02:44 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered
 
armandodiaz's Avatar
 
Join Date: Sep 2003
Location: Miami, FL
Posts: 2,464
Garage
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.
__________________
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
Old 08-29-2005, 05:16 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered
 
kach22i's Avatar
 
Join Date: Mar 2004
Location: Michigan
Posts: 53,987
Garage
Excellent picture, thanks.
__________________
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
Old 08-29-2005, 06:43 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered
 
Join Date: May 2004
Location: Snohomish County WA
Posts: 691
Garage
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.
__________________
-Steve

'87 Carrera Targa
Old 08-29-2005, 07:28 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Unregistered
 
sammyg2's Avatar
 
Join Date: Aug 2000
Location: a wretched hive of scum and villainy
Posts: 55,652
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?
Old 08-29-2005, 08:45 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered
 
jluetjen's Avatar
 
Join Date: Oct 2001
Location: Westford, MA USA
Posts: 8,852
Garage
Good point about the heat ranges. In order for the comparison to be meaningful, both plugs have to be of comparable heat ranges.
__________________
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
Old 08-29-2005, 09:59 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered
 
Join Date: Apr 2005
Location: Olympia, WA
Posts: 236
Those plugs have the same heat range.

Mike
__________________
'77 911 3.0
'94 Mustang GT
'77 911 (soon be a real live racecar!)
Old 08-29-2005, 08:48 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Registered
 
Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
Quote:
Originally posted by Shocker
Those plugs have the same heat range.

wow.

and NGK BP6ES is one step colder than plugs for rich carbs. Meaning I ran BP7&8 ES with CIS.

__________________
Ronin LB
'77 911s 2.7
PMO E 8.5
SSI Monty
MSD JPI
w x6
Old 08-29-2005, 09:10 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Reply


 


All times are GMT -8. The time now is 05:51 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.