Q451990
Old School Q Guru
Offline
6924 posts
1990 Q45 - 96K, 2005 G35 Sedan - 51K, 2004 Frontier M/T - 57K
Columbia, SC
7-23-2002
|
I just looked in the manual on MA-17 and it says that it's not necessary to check or regap the plugs. They come pre-gapped from the factory, so I always just put them in... one of the few things that doesn't require tweaking!Heath
1990 Infiniti Q45 **** AKA "Q2"
2005 Infiniti G35 **** Sedan A/T
2004 Nissan Frontier.. King Cab M/T
|
911/Q45
Offline
1376 posts
Autos, Fitness
San Luis Obispo, CA
7-23-2002
|
Wonder what would happen if they got bumped out of tolerance?
|
Q45tech
Q45 Guru
Offline
13721 posts
1990 Q45 323,000 miles 19.5 years ownership
Marietta , Georgia
4-30-2002
|
The serious amount of voltage available from individual coil on plug systems means that in theory any gap [in a wider direction]would be statisfactory.
The reason for 60k recommended changes has to do with galling of the plug into the head and the necessity to examine the plug wells for oil leaks.The NGK [PFR6B-11] plugs themselves seem to be fine for 100k or more assuming all sensors/ecu are opering correctly [mixture is under control] and the engine is not continuously driven in cool start [short multiple 10 minute trips per day]! After the first 150,000 miles additional ring blowby [and or stem seal leaks] may add to combustion chamber deposits which could mean that 60k is the useful life without cleaning. The above assumes that the injectors are clean and the rear of intake valves are not burbened with deposits.....altering the mixture.
Copyright 2009. Nipuspan International Corporation. All rights reserved. This material may not be broadcast, rewritten or redistributed.
http://www.t3atlanta.com/
|
Aussie Q45
Offline
56 posts
1990 Nissan Infinity Q45. '46 Ford Super Deluxe (Restored)
Brisbane Queensland
2-3-2005
|
| « Re: (Q45tech) | 3:51 PM 2/17/2005 |
|
| Quote, originally posted by Q45tech » | The serious amount of voltage available from individual coil on plug systems means that in theory any gap [in a wider direction]would be statisfactory.
The reason for 60k recommended changes has to do with galling of the plug into the head and the necessity to examine the plug wells for oil leaks.The NGK [PFR6B-11] plugs themselves seem to be fine for 100k or more assuming all sensors/ecu are opering correctly [mixture is under control] and the engine is not continuously driven in cool start [short multiple 10 minute trips per day]! After the first 150,000 miles additional ring blowby [and or stem seal leaks] may add to combustion chamber deposits which could mean that 60k is the useful life without cleaning. The above assumes that the injectors are clean and the rear of intake valves are not burbened with deposits.....altering the mixture. |
The local NGK Distributor informed me that the - 11 part of the plug number indicates that the gap should be around 1.1mil. I guess that would have to be a starting point. When I checked mine out of the pack, 2 = 2.4mil, 3=1.8 mil & 3 were around the .6mil. I figured that to try to get an even burn in all 8 pots I should gap all the plugs the same.
Any comments greatly appreciated
|
911/Q45
Offline
1376 posts
Autos, Fitness
San Luis Obispo, CA
7-23-2002
|
Wow, you've been digging deep to pull up this old thread! I'd go with the average of 1.8, it doesn't sound like it's a major deal.
|
Aussie Q45
Offline
56 posts
1990 Nissan Infinity Q45. '46 Ford Super Deluxe (Restored)
Brisbane Queensland
2-3-2005
|
| « Re: (911/Q45) | 4:14 PM 2/17/2005 |
|
Yeh Thanks
I don't like annoying you blokes too much if the info is already there SOMEWHERE. Wish I could get my hands on a FSM
Great site, keep up the good work
Regards Greg
|
DAEDALUS
Offline
6231 posts
1990 Q45
El Segundo, CA
7-22-2002
|
I assume by "mil" you mean millimeter? We're still on English units over here. A mil here = .001 inches = .0254mm.1.8 mm sounds pretty wide to me. 1.1mm = .043", which is close to common for most platinum plugs I think (.035-.045). There's no gap given in the FSM because they should never need to be gapped between 60,000 mile change intervals. I think I measured new plugs at .045".
|
Aussie Q45
Offline
56 posts
1990 Nissan Infinity Q45. '46 Ford Super Deluxe (Restored)
Brisbane Queensland
2-3-2005
|
| « Re: (DAEDALUS) | 10:33 PM 2/17/2005 |
|
Thanks Daedalus
Will gap all of them at .045 then. What a hell of a job, it's taken me half a slab of stubbies so far and I only have 4 plugs out!!! 
Greg
|
911/Q45
Offline
1376 posts
Autos, Fitness
San Luis Obispo, CA
7-23-2002
|
More Stubbies=less work accomplished!
|
Aussie Q45
Offline
56 posts
1990 Nissan Infinity Q45. '46 Ford Super Deluxe (Restored)
Brisbane Queensland
2-3-2005
|
| « Re: (911/Q45) | 2:21 PM 2/18/2005 |
|
More Stubbies = Less PAIN 
|
| |
