| Scott Novak |
Mon Nov 24, 2008 8:50 am |
|
These are various NGK Non-Resistor copper core 14 mm spark plugs. The spark plug gap indicates the gap as they come out of the box. The spark plugs are listed in order of heat ranges from the Hottest at the top to Coldest at the bottom. The spark plugs with a stock number listed are spark plugs that I have actually found being sold by someone online such as http://www.rockauto.com/ or http://www.ngk.com/ The spark plugs without stock numbers listed are valid part numbers, but may be difficult to find.
If there are numbers at the end of the spark plug number, it indicates the spark plug gap in mm. Example, a BP6HS10 has a 0.040" spark plug gap. A BP8HS15 has a 0.060" spark plug gap. If there is no number at the end it has a 0.025" gap.
For a stock 1600, the projected core non-resistor NGK BP6HS, or BP6HS10 is a good choice. With a high energy ignition system, such as a Jacobs, you can usually use a spark plug that is one heat range colder such as a BP7HS10, and help insure against pre-ignition or run on.
The only reason not to use a projected core spark plug is if you have an extreme engine with a turbocharger, or are using nitrous oxide, or have an extremely high compression ratio. A projected core spark plug acts like a hotter heat range spark plug at light load and keeps the spark plugs clean. At higher RPM at full load, the incoming fuel mixture cools the spark plug a bit making it act more like a colder heat range spark plug. Also, the projected core puts the spark further into the combustion chamber, thereby reducing the ignition lag time, and making your spark timing closer to optimum.
Resistor spark plugs have no place in any engine trying to achieve maximum performance or maximum gasoline mileage. The only purpose for the resistors is to eliminate electrical interference by the cheapest means possible. Not the best. With a high energy ignition system, using resistor spark plugs is like using a 2" merged exhaust system with a 1" stinger.
In my opinion, carbon core ignition wire, OEM VW ignition wire with the resistor spark plug ends, resistor rotors, and resistor spark plugs should be made ILLEGAL as they waste gasoline. Low loss spiral wound magnetic suppression ignition wires are readily available and will prevent radio noise. By using good quality ignition wires you can increase your spark plug gaps by about 0.005" because of the reduced losses, and improve your performance.
NGK Spark Plug Code:
http://www.ngksparkplugs.com/docs/tech/design_symbols_plugs.pdf
Code: 14 mm Thread 12.7 mm Reach 13/16” Hex
NGK NGK
Projected Standard
Core
Spark
Plug Part Stock Part Stock
Gap Number Number Number Number
====== =============== ===============
0.025” BP2HS 7926
0.040” BP2HS10
------ --------------- ---------------
0.025” BP4HS 3611
0.040” BP4HS10 5011
------ --------------- ---------------
0.025” BP5HS 4111 B5HS 4210
0.025” BP5HS10
------ --------------- ---------------
0.025” BP6HS 7331 B6HS 7534
0.040” BP6HS10 6326 B6HS10 1052
------ --------------- ---------------
0.025” BP7HS 5111 B7HS 5110
0.040” BP7HS10 7829 B7HS10 2129
------ --------------- ---------------
0.025” BP8HS 2630 B8HS 5510
0.040” BP8HS10 3823 B8HS10 5126
0.060” BP8HS15 6729
------ --------------- ---------------
0.025” B9HS 5810
0.040” B9HS10 3626
------ --------------- ---------------
0.025” B10HS 2399
===========================================
14 mm Thread 19 mm Reach 13/16” Hex
NGK NGK
Projected Standard
Core
Spark
Plug Part Stock Part Stock
Gap Number Number Number Number
====== =============== ===============
0.025” BP2ES
------ --------------- ---------------
0.025” BP4ES 6928 B4ES 4129
0.040” BP4ES10
------ --------------- ---------------
0.025” BP5ES 7832 B5ES 6410
0.044” BP5ES11 7732
0.052” BP5ES13 4012
------ --------------- ---------------
0.025” BP6ES 7333 B6ES 7432
0.044” BP6ES11 7334 B6ES11 7910
0.052” BP6ES13 2212
------ --------------- ---------------
0.025” BP7ES 1034 B7ES 1111
0.044” BP7ES11 2712 B7ES11 2311
------ --------------- ---------------
0.025” BP8ES 2912 B8ES 2411
------ --------------- ---------------
0.025” BP9ES 7526 B9ES 2611
------ --------------- ---------------
0.025” B10ES 7928
===========================================
14 mm Thread 19 mm Reach 5/8” Hex
NGK
Projected
Core
Spark
Plug Part Stock
Gap Number Number
====== ===============
0.025” BCP4ES
0.044” BCP4ES11 1086
------ ---------------
0.025” BCP5ES 7496
0.044” BCP5ES11
------ ---------------
0.025” BCP6ES 4930
0.044” BCP6ES11 7210
------ ---------------
0.025” BCP7ES 5030
0.044” BCP7ES11
========================
|
|
| vwracerdave |
Mon Nov 24, 2008 9:18 am |
|
| Thanks for trying, but all that is so over my head that I have no clue what you said. |
|
Powered by phpBB © 2001, 2005 phpBB Group
|