How frequent for NGK Tr55 plug change
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How frequent for NGK Tr55 plug change How often are you supposed to change out NGK Tr 55's? I've been running them for about 2 years and change them about every 10-12k. Is this about right? I'm not that happy with them excpet for price, they seem to produce a miss and I have them gapped correctly at .050. What other plugs are good? I don't want anything expensive. How about Autolite's, anything good about them? Part number?
Launching!
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From: Monticello, MN
I run GM 41-985 Iridium plugs. They are now the stock recommended plug by GM for the LS1. I have a heads/cam C5 and they run great. In addition, they are a long life plug...no screwing around changing them out all the time. 
Ed
Ed
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From: Live Oak, FL - in the woods where the creatures lurk.
Originally Posted by Vrbas
Unless you spray, they should last as long as your engine does.
NGK TR55s are great plugs, IMO, but like all copper electrode plugs these need to be changed more frequently than platinum or iridium plugs.
I have changed my plugs 5 times within 136K miles, each time with TR55s. I've never had a problem that could be attributed to the plugs, AFAIK.
I ran NGK plugs on my flat track and motocross bikes way back when because the other brands would foul out too easily. FWIW.
Originally Posted by gwj
I totally disagree. Copper plugs are not high mileage plugs.
NGK TR55s are great plugs, IMO, but like all copper electrode plugs these need to be changed more frequently than platinum or iridium plugs.
I have changed my plugs 5 times within 136K miles, each time with TR55s. I've never had a problem that could be attributed to the plugs, AFAIK.
I ran NGK plugs on my flat track and motocross bikes way back when because the other brands would foul out too easily. FWIW.
NGK TR55s are great plugs, IMO, but like all copper electrode plugs these need to be changed more frequently than platinum or iridium plugs.
I have changed my plugs 5 times within 136K miles, each time with TR55s. I've never had a problem that could be attributed to the plugs, AFAIK.
I ran NGK plugs on my flat track and motocross bikes way back when because the other brands would foul out too easily. FWIW.
Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
Originally Posted by Redneck Z
I agree. They won't last as long as your engine does, unless you are only getting 15,000k out of your motor. I'd say ~15,000k is pushing it for a copper plug.
Originally Posted by RPM WS6
Nah, I've seen 'em come out of LS1s after 20-30K miles and look good still. If the tune is good, 30K is totally doable unless you're idling through constant heavy traffic 95% of the time.
Personally, I wouldn't go much more than 15k if you want optimal performance. Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
Originally Posted by Redneck Z
They might still work after 20-30k miles, but their peak performance begins to taper after about 5-7k. Personally, I wouldn't go much more than 15k if you want optimal performance.
Personally, I wouldn't go much more than 15k if you want optimal performance.That statement might be true for the colder TR6 plug, but not the TR55. Just my experiance.
Last edited by RPM WS6; Nov 17, 2005 at 05:40 AM.
