Plugs

[1ptturbo]

Torque specifications are calculated for dry threads unless stated otherwise!

[purple04]

told you it was debated! Any other problems with the instructions, guys?

[1ptturbo]

quote:Originally posted by purple04

told you it was debated! Any other problems with the instructions, guys?

What's to debate if even the spark plug manufacturers tell you not to.

[AA PT]

[/quote]You cannot "over torque" if you are using a properly calibrated torque wrench.[/quote]

This is not a true statement. If you use certain lubricants on the threads like PROLONG's assembly lube, you will over torque. All of the aluminum rod manufacturers warn that you take the chance of damaging or pulling the threads out of the rod because of the friction loss between the bolt and aluminum thread. Improperly lubricating the threads and eliminating the friction will allow you to go beyond the intended normal torque specs.

If a test situation were set up where bolt stretch (stress) was measured based on torque, a none lubricated assembly would require higher torque to reach the desired bolt stretch while a lubricated assembly would require significantly less torque to acheive the same amount of stretch. The stress measured on the threads would show the same results.

[Cal Cruzer]

We are now talking about 2 different things. a TTY (torque to yield) bolt is something different than a spark plug. The TTY bolt's required clamping load is established when the bolt is in the plastic stage not the elastic stage (trying to remember the stuff I learned about TTY bolts). A spark plug is not a TTY bolt. The clamping force is to tighten the plug, granted, but it's also to compress the crush washer to form the seal.

[AA PT]

quote:Originally posted by Cal Cruzer

We are now talking about 2 different things. a TTY (torque to yield) bolt is something different than a spark plug. The TTY bolt's required clamping load is established when the bolt is in the plastic stage not the elastic stage (trying to remember the stuff I learned about TTY bolts). A spark plug is not a TTY bolt. The clamping force is to tighten the plug, granted, but it's also to compress the crush washer to form the seal.

Very true. You are not stretching the spark plug threads like you would a bolt especially considering the low number, but you are still stressing the threads. The stated torque is a factor of friction and crush. Remove the friction and the torque value is compromised...and you will end up pulling the aluminim threads since that's the weakest link. Trust me.

Anti-seize is not a high performance lubricant, and I personally don't see any problem using it.