Re: Anti- sieze on NGK TR55 plugs
 

In theory maybe but there's plenty of metal to metal contact at the gasket area.

Re: Anti- sieze on NGK TR55 plugs
 

Interesting theory....
Since spark plugs operate at a very high voltage 40K volts or more?...but very low current something measured in miliamps . A very small contact area with the head should be enough grounding....In theory...would like to hear more on this ...these plugs have a tapered seat and no washer to compress. When the seat hits the head...thats it..they dont really turn after that. I dont see how they can be over tightened without causing severe damage. So im going to theorize (again) that the plugs were so hard to get out because they have been in there awhile, and no anti-seize was used.

Re: Anti- sieze on NGK TR55 plugs
 

You saying taper seat plugs on aluminum head? Didn't think that was possible.

Re: Anti- sieze on NGK TR55 plugs
 

After ripping the threads out of my alum head from a seized spark plug, I'm not inclined to put in a plug without anti-seize again. Incidentally, happened at a divisional race 1000 miles from home so not the most opportune time for it to happen.

Jim Caughlin
SS6019

Re: Anti- sieze on NGK TR55 plugs
 

Taper seat plugs are what we use on our LT1 and LS1 aluminum heads.

Re: Anti- sieze on NGK TR55 plugs
 

Thank you. Learned something new

Re: Anti- sieze on NGK TR55 plugs
 

Biggest problem with anti-seize is that folks tend to slop it on instead of using small amounts per the mfg's instructions.:eek:
Regards,
HB2:)
Dissident

Re: Anti- sieze on NGK TR55 plugs
 

I use anti-seize, however, not all anti-seize products are the same. I recommend either a Copper or Nickle based high temperature antiseize. The Champion brand that Curtis Reed showed in the earlier post is a very great product used in aviation.

Based on recommendations from a friend that managed a NASCAR engine shop for many years, I use Copaslip high temp anti-sieze on the spark plug threads. Copaslip makes two products, Copaslip and Molyslip; the one to use is Copaslip without moly. Moly, when exposed to high temperatures may induce corrosion.

Another great product is Jet-Lube NIKAL anti-seize, which is nickel based and the Ford XL-2 High Temperature Nickel Anti-Seize.

Not only I recommend these products for spark plugs, but also with O2 sensors.

Also, proper torque is critical, for the right thread engagement I suggest using the manufacturer specification. I have seen to many plugs that appear to have been installed with a breaker bar. It is also recommended that when you have a sealing washer, torque, loosen and re-torque to compress the washer, making sure you get the proper thread engagement and heat transfer.

Re: Anti- sieze on NGK TR55 plugs
 

With dissimilar metals (steel spark plug, aluminium head) there's an electrolysis that occurs. That is what welds the plugs into the heads like in Jims example. Electricians use it for the same reason. The same electrolysis that occurs in the cooling system and can be measured with a volt meter because its acting like a battery. And where an anode saves other things in the cooling system from erosion.

Re: Anti- sieze on NGK TR55 plugs
 

I also use it on intake & header bolts. Anything that screws into aluminum.