Notices
Series II Technical and Trouble shooting Discuss technical details for the Series II RX-8 and any issues or problems you are facing

NGK Spark Plug GAPS

Old 12-20-2010, 11:09 PM
  #1  
Super Moderator
Thread Starter
 
ASH8's Avatar
 
Join Date: Apr 2005
Location: Australia
Posts: 10,624
Received 156 Likes on 113 Posts
NGK Spark Plug GAPS

I know this is not ground breaking news, BUT, I could not find an easy reference here on allowable or recommended Spark Plug GAPS for Trailing and Leading NGK plugs.

When it comes to specific Rotary Models, only use what is recommended for the RENESIS, don't try Frankenstein plug combinations from other Rotaries.

The GAPS are as follows for RX-8 Spark Plugs..

Brand New NGK Spark Plugs
1.15-1.25mm (0.046-0.049in)

Used Maximum GAP
1.50mm (0.059in) Leading Plug
1.40mm (0.055in) Trailing Plug

I do not suggest or recommend the manipulation or bending of ground strap to close or reduce the "GAP" in well used (old) Rotary Spark Plugs.

Some may do it, but IMO it is not worth the risk of weakening tiny weld joints.

So if your plugs are close to the Maximum Gap or over it, consider replacing them.
ASH8 is offline  
Old 02-19-2011, 09:55 PM
  #2  
Registered User
 
Join Date: Oct 2009
Location: somewhere in Kansas
Posts: 14
Likes: 0
Received 0 Likes on 0 Posts
when i replaced my spark plugs i was told they were ready to go?..... i own a 04 rx8, ive been having idle issues im kinda new to the forums
Acykj424 is offline  
Old 02-20-2011, 12:40 AM
  #3  
Sydney, Australia
 
SARRAS's Avatar
 
Join Date: Feb 2009
Location: Sydney, Australia
Posts: 202
Likes: 0
Received 1 Like on 1 Post
AU

Originally Posted by Acykj424 View Post
when i replaced my spark plugs i was told they were ready to go?..... i own a 04 rx8, ive been having idle issues im kinda new to the forums
I think 2 things may also be relevent - they are an Iridium plug and general instructions on those is 'Do Not Gap' as the centre electrode is so fragile to force. So all Iridiums are pre-gapped as such.

Secondly, since these plugs ONLY fit our cars - what other gap would they be set for!

Last edited by SARRAS; 02-22-2011 at 02:53 PM.
SARRAS is offline  
Old 02-20-2011, 12:45 AM
  #4  
I zoom therefore I am.
 
laythor's Avatar
 
Join Date: Mar 2007
Location: San Jose, CA
Posts: 4,919
Likes: 0
Received 5 Likes on 5 Posts
do not gap iridium plugs
laythor is offline  
Old 02-20-2011, 09:14 AM
  #5  
Registered
iTrader: (3)
 
Join Date: Apr 2004
Location: macon, georgia
Posts: 10,770
Likes: 0
Received 8 Likes on 8 Posts
the denso iridium plugs have a much stouter ground straps and can be gapped --carefully.
Some have had really bad results in gapping the ngks, but i still do, but only one time when they are brand new. I only barely touch the center electrode. You do have to be VERY careful and gentle. I do look at the grounding strap with a magnifying glass afterward.
olddragger is offline  
Old 02-20-2011, 09:51 AM
  #6  
Super Moderator
Thread Starter
 
ASH8's Avatar
 
Join Date: Apr 2005
Location: Australia
Posts: 10,624
Received 156 Likes on 113 Posts
Hi Denny, I have a few Denso Iridium Racing Plugs, they are a very well made plug, 0.4 mm Ir electrode tip.

I have only just received them, they warn about using any thread lubrication?, the thread and plug body is Very shiny almost like a full chrome job...highly polished nickle plate?..

Got to go to bed now..Good Night ...

I have some good new info for club members soon...
ASH8 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
DylanForbes
RX-8 Discussion
25
10-31-2017 05:47 PM
RevMeHarder
New Member Forum
5
09-22-2015 06:36 PM
1.3_LittersOfFurry
Series I Trouble Shooting
9
09-22-2015 01:54 AM
Vedivan1
Series I Trouble Shooting
2
09-18-2015 12:39 PM
Irvinb16
New Member Forum
5
09-11-2015 10:27 PM


Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 1 votes, 5.00 average.

Quick Reply: NGK Spark Plug GAPS


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.