W9DC Spark Plugs - Pagoda SL Group

Trang chủ » Bosch W9dc Ngk » W9DC Spark Plugs - Pagoda SL Group

Có thể bạn quan tâm

Pagoda SL Group Welcome, Guest. Please login or register. 1 Hour 1 Day 1 Week 1 Month Forever Login with username, password and session length This topic This board Entire forum Google

News:

Become a Full Member and get the official Linkage Tour and the official Starting Aid. This information alone will pay for your membership

  • Pagoda SL Group »
  • W113 Pagoda SL Group »
  • Electrical and Instruments »
  • W9DC Spark Plugs
« previous next »
  • Print
Pages: [1]

Author Topic: W9DC Spark Plugs (Read 8711 times)

hauser

  • Guest
W9DC Spark Plugs
« on: August 13, 2009, 02:04:06 » Hello AlfredI have a Crane XR700 installed in my '69. As you know I take it to Continental Imports in Gainesville for service work. In my six years of going there the plugs have been replaced twice with W7DC according to the invoice. However the tech said he had used a WR7DC. I have upgraded the alternator to a 55amp Bosch unit and every once in a while for a split second the engine will cut off. All services are up to date. Could this have anything to do with the spark plugs? If my plugs are indeed the W7DC what changes if any would the W9DC plugs make?I apologise for the inquiry considering this is the items for sale section. :-[ Logged

Benz Dr.

  • Associate Member
  • Platinum
  • ******
  • Canada, ON, Port Lambton
  • Posts: 7220
  • Benz Dr.
W9DC Spark Plugs
« Reply #1 on: August 13, 2009, 02:30:46 » W7DC are the recomended plug for a lot of these older cars but for the most part they're generaly too cold. Unless your engine has perfect compression, doesn't use any oil, and everything is at optimal settings, they often foul out and can make your engine run rich.The hotter plugs heat up faster and run at a higher temp. This helps to keep them clean so the chance of fouling and then misfire is for the most part reduced or eliminated. Logged 1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA ''The Red Rocket ''Dan Caron's SL Barn1970 3.5 Coupe1961 190SL1985 300CD Turbo Coupe1981 300SD2013 GMC Sierra1965 230SL1967 250SL1970 280SL1988 560SEC

hauser

  • Guest
W9DC Spark Plugs
« Reply #2 on: August 13, 2009, 03:27:04 » What should the gap be on a W9DC? Logged

jacovdw

  • Guest
Re: W9DC Spark Plugs
« Reply #3 on: August 13, 2009, 09:43:26 » The gap should be 0.7 mm or 0.028 inches (if I have my conversion right).That is assuming that you are running a stock ignition system. With a "modified" ignition system, you can open the plug gap a little.I'm using NGK BP6ES gapped at 0.9 mm with a Bosch red coil, 1.8 Ohm ballast resistor, 1 kilo Ohm plug ends and a Pertronix ignitor. « Last Edit: August 13, 2009, 09:52:29 by jacovdw » Logged

waqas

  • Full Member
  • Platinum
  • ******
  • USA, TX, Austin
  • Posts: 1738
Re: W9DC Spark Plugs
« Reply #4 on: August 13, 2009, 17:45:48 » Don't all these plugs come pre-gapped now? I've never had to set the plug gap when putting in new plugs. Logged Waqas (Wa-kaas) in Austin, Texas

graphic66

  • Guest
Re: W9DC Spark Plugs
« Reply #5 on: August 13, 2009, 18:08:18 » A slight bang or bump can change the gap. You must always confirm the gap, even if you gap one and set it down, check it. You sometimes drop them and close up the gap. Check them and recheck them to be sure. It is easy and fast and free. I sometimes find them all set and sometimes all wrong. Logged

Benz Dr.

  • Associate Member
  • Platinum
  • ******
  • Canada, ON, Port Lambton
  • Posts: 7220
  • Benz Dr.
Re: W9DC Spark Plugs
« Reply #6 on: August 14, 2009, 00:08:18 » I think they're pre set at .032 and I leave them there. Having the gap too close will cause a missfire. Logged 1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA ''The Red Rocket ''Dan Caron's SL Barn1970 3.5 Coupe1961 190SL1985 300CD Turbo Coupe1981 300SD2013 GMC Sierra1965 230SL1967 250SL1970 280SL1988 560SEC

66andBlue

  • Full Member
  • Platinum
  • ******
  • USA, CA, Solana Beach
  • Posts: 4737
Re: W9DC Spark Plugs
« Reply #7 on: August 14, 2009, 00:27:16 » W9DC: pre-gapped at 0.9 mm = 0.0354 inchTorque: 25 Nm = 19 ft. lbs. * W9DC.jpg (31.99 kB, 376x191 - viewed 637 times.) Logged Alfred1964 230SL manual 4-speed 568H signal red1966 230SL automatic 334G light blue (sold)1968 280SL automatic (now 904G midnight blue)

Dash808

  • Full Member
  • Silver
  • ****
  • USA, HI, Kaneohe
  • Posts: 320
Re: W9DC Spark Plugs
« Reply #8 on: August 14, 2009, 04:47:34 » I just put a set of NGK BP5es in. They were all gapped at .35 out of the box. Just right and runs great. Logged Chan Johnson'67 250slNapoli Italian EuroBang Bang Booogie!

mdsalemi

  • Pagoda SL Board
  • Platinum
  • ******
  • USA, NC, Davidson
  • Posts: 7092
Re: W9DC Spark Plugs
« Reply #9 on: August 17, 2009, 15:46:48 » On the spark plug topic...How do you know if you are running the right plug? I have NGK BP6ES; how do I know if this is the right plug, or one heat range hotter or colder might be better?Obviously the thing to do is try--but assume for a moment that I have three sets of plugs, my BP6ES, and whatever the next hotter or colder plug is. What are the symptoms/running characteristics I would see with a plug out of the right heat range?? « Last Edit: August 17, 2009, 20:13:56 by mdsalemi » Logged Michael SalemiDavidson, North Carolina (Charlotte Area) USA1969 280SL (USA-Spec)Signal Red 568G w/Black Leather (Restored)2023 Ford Maverick Lariat Hybrid "Area 51"2023 Ford Escape Hybrid2024 Ford Mustang Mach Ex PEV

Dash808

  • Full Member
  • Silver
  • ****
  • USA, HI, Kaneohe
  • Posts: 320
Re: W9DC Spark Plugs
« Reply #10 on: August 17, 2009, 21:53:16 » According to NGK: Spark plug tip temperature must remain between 500- 850 deg C. One heat range hotter or colder = 70-100 deg C. Temps <500 deg will lead to fowling and misfire. Temps >850 deg will lead to preignition/detonation.For best results learn to read the plug. A good read:http://www.ngksparkplugs.com/techinfo/spark_plugs/techtips.asp?nav=31000&country=US Logged Chan Johnson'67 250slNapoli Italian EuroBang Bang Booogie!
  • Print
Pages: [1] « previous next »
  • Pagoda SL Group »
  • W113 Pagoda SL Group »
  • Electrical and Instruments »
  • W9DC Spark Plugs
  • SMF 2.0.19 | SMF © 2020, Simple Machines | Terms and Policies
  • XHTML
  • RSS
  • Pagoda SL Group © 2025

Page created in 0.024 seconds with 23 queries.

Từ khóa » Bosch W9dc Ngk