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  #21  
Old 09-16-2015, 11:35 AM
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How does a shrouded spark (from hooked electrode) IMPROVE response?

Also, which of those benefits do not apply to.........

https://www.boschautoparts.com/auto/...on-spark-plugs
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  #22  
Old 09-16-2015, 12:14 PM
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Quote:
Originally Posted by TiAgX5 View Post
How does a shrouded spark (from hooked electrode) IMPROVE response?

Also, which of those benefits do not apply to.........

https://www.boschautoparts.com/auto/...on-spark-plugs
My quote was regarding fine wire center electrodes plugs promote un-shrouding of the plug that provide clean first fire at the cyl due to lean mixtures".

To keep this simple for most of the non techie readers: Multiple side electrodes (side straps in Champion terminology) only create more shrouding issues in lean conditions. Do many plug manufacturers market plugs more for marketing hype than actual performance gains that are measureable...you bet. See Split Fire Plugs, Y Fire Plugs, and a host of others.

In the DIY world, pick a plug you like that provides proper service (life, fit, fires) and enjoy. All other issues are "bench racing" that require engines, dynos, lab equipment, and skilled operators to confirm results, none of which I have access to since I left Champion Spark Plugs and Dana Corporation Engine Management Div (Accell Racing Ignition, Hurst Shifters, Borg Warner Trans /Clutches, Borg Warner, Neihoff, NAPA, Beck Arnold Ign, Mr Gasket, Fuel Management parts (Injectors, pumps, lines, rails & Tanks) etc. Welcome to conglomerates and roll ups, Dana is a $14.4 Billion company now) and moved into the IT world.

Old adage: Put 5 engineers in a room to come up with a solution to a problem and you will get back 109 solutions that you as the manager get to pick from, as each one of their 109 approaches has SWOT (Strengths, Weaknesses, Opportunities for improvements, and Threats that it will not).
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Current Garage:
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2002 M5 TiSilver
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Last edited by StephenVA; 09-17-2015 at 09:52 AM.
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  #23  
Old 12-26-2016, 11:04 PM
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Originally Posted by StephenVA View Post
Tip and Trick for those who have the REPLACEABLE coil to plug boots. Replace them at 80-100K (OR 10 years) as the resistance will grow until the plug will not fire as the boot resistance exceeds the coil's output. They just twist and pull off. They are nothing but a really short plug wire. Later models have molded boots that do NOT come off. Images below...

The first indication is poor idle and miss fires in high load situations (part throttle hill climbs)

Cheap part but make sure you match up coil brand/manufacture to the boot you are buying. (Bremi/Bosch)

More images BMW E53 X5 M54 3.0L Engine Ignition - ECS Tuning
Not sure what your saying here. Are you saying to replace all 6 COPS?
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  #24  
Old 12-26-2016, 11:11 PM
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- The rubber boots crack after 150K or so, and they are cheap.
- The ignition coils: replace them only when they go bad. Best is to buy a few used coils on ebay and leave them in the trunk as spare. You can swap them in the middle of nowhere w/o any special tool.
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  #25  
Old 12-26-2016, 11:14 PM
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Ok, just looked on Pelican parts. Looks like they are only replaceable on certain years and "not" on my 2004 X5 3.0

Looks like my only option is to replace the whole COP.

X5 3.0i (2001 thru September 2002)
X5 4.4i (2000-03)
X5 4.6is (2002-03)

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  #26  
Old 12-27-2016, 03:36 PM
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If you have the "new style" coils see images below then the boot are part of the coil and do not suffer from deterioration like the "older" versions.
Attached Images
  
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2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
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  #27  
Old 12-27-2018, 03:50 PM
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Outstanding thread and discussion!


Not new to changing plugs, but things are too expensive for discovery learning.


Going after single prong Iridium plugs!
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  #28  
Old 12-28-2018, 07:00 AM
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Good move!
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2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
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  #29  
Old 12-28-2018, 07:11 PM
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Just a heads up... NGK says specifically on an aluminum block not to use anti-seize... danger of over-torquing the plugs.
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  #30  
Old 12-28-2018, 09:08 PM
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- Look up what torque necessary to strip the cylinder head threads.
Go to junk yard and play with spark plug and threads, it takes way beyond 100 ft*lb to cause any damage.

- Google that topic (what torque can cause cylinder head damage).

- I have been using anti-seize for 20 years using the same torque, zero issues.
If you are worried, you can reduce the torque a bit, let's say the book states 18 ft*lb, then with antiseize, reduce it to 16 ft*lb or something like that.
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