[Z06] Spark Plugs
Le Mans Master
Joined: Dec 2001
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From: Winchester TN
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St. Jude Donor '03-'04-'05-'06-'07-'11
Re: Spark Plugs (edwards)
Hi edwards -
I have been told by reliable sources that changing to the TR's will give you more low end response - I am going to do this when the weather breaks.
Anyone know if we should use the stock gap on the TR plugs?
Best Regards -
[Modified by mqqn, 8:58 PM 2/4/2003]
I have been told by reliable sources that changing to the TR's will give you more low end response - I am going to do this when the weather breaks.
Anyone know if we should use the stock gap on the TR plugs?
Best Regards -
[Modified by mqqn, 8:58 PM 2/4/2003]
Race Director
Joined: May 2000
Posts: 12,712
Likes: 2,271
Re: Spark Plugs (edwards)
NGK TR55s could actually be called a "downgrade". They are fine plugs, but are conventional nickel electode copper core plugs that cost about two bucks each. Thye are the proper geometry and heat range for Corvette engine and have a nominal life of about 30K miles.
The OEM plugs are a double platinum long life design with a change recommendation interval of 100K miles. The are fine for normal driving, but anyone who hot laps should install a plug that is one or two heat ranges colder than OEM for track events.
BTW the OEM plugs are supplied to GM by Denso, not AC. Check out your owners manual.
Duke
The OEM plugs are a double platinum long life design with a change recommendation interval of 100K miles. The are fine for normal driving, but anyone who hot laps should install a plug that is one or two heat ranges colder than OEM for track events.
BTW the OEM plugs are supplied to GM by Denso, not AC. Check out your owners manual.
Duke
Burning Brakes
Joined: Mar 2000
Posts: 973
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From: San Jose, CA
Re: Spark Plugs (SWCDuke)
I have decided to go with the OEM recommendation of the Denso aka PTJ16R15 or Denso type pn#25315018. (Sold as an AC Delco PN also). I have been reading on this forum and others that the OEM tried many combinations before settling on the above spark plug. I now have app 50k on the original ones and can't really decide to change them or let them go close to the 100k as specified by Chevrolet.
They are not inexpensive (app $5-8 per)
They are not inexpensive (app $5-8 per)
Burning Brakes
Joined: Jun 1999
Posts: 1,028
Likes: 0
From: La Jolla, CA
Re: Spark Plugs (clintw)
People were raving about Iridium a while back: they're supposed to be better than Platinum. Any evidence, one way or the other? The NGK TR-55-IX (Iridium) are $6.95 here: http://www.thunderracing.com/index.c...ategoryid=1090 .
NGK site explaining benefits of Iridium over Nickel and Platinum: http://www.ngksparkplugs.com/product.../iridiumix.asp
Denso site explaining the benefits of Iridium: http://www.densoiridium.com/faq.php
[Modified by johnC5, 12:37 AM 2/8/2003]
NGK site explaining benefits of Iridium over Nickel and Platinum: http://www.ngksparkplugs.com/product.../iridiumix.asp
Denso site explaining the benefits of Iridium: http://www.densoiridium.com/faq.php
[Modified by johnC5, 12:37 AM 2/8/2003]
Race Director
Joined: May 2000
Posts: 12,712
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Re: Spark Plugs (ruking1)
My concern with 100K spark plugs is that they will seize up, so I always remove them for inspection at least every 30K, if not more frequently.
My suggestion would be to remove them, and if they do not have excessive deposit build-up, check and reset the gaps as necessary and reinstall them, but be very careful not to break off the platinum button on the ground electrode if you have to bend it to adjust the gap.
Also, these are taper seat "peanut plugs", and you want to be sure to seat them with a torque wrench at 10-12 lb-ft. No more!
Duke
My suggestion would be to remove them, and if they do not have excessive deposit build-up, check and reset the gaps as necessary and reinstall them, but be very careful not to break off the platinum button on the ground electrode if you have to bend it to adjust the gap.
Also, these are taper seat "peanut plugs", and you want to be sure to seat them with a torque wrench at 10-12 lb-ft. No more!
Duke
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