Need some help here; The correct torque for spark plugs according to the book is between
12\18 foot pounds. My torque wrench starts out at 25 foot pounds so I need to convert 12\18 foot pounds to inch pounds. According to the torque conversion I should multiply foot pounds by 12 in order to get the correct inch pounds so; 12 x 15 (middle of the road between 12 and 18 foot pounds) would be 180 inch pounds. Am I correct???

 

Yeah, thats right. 180.

 

Correct!

 

That's the conversion I've always known, so that is what I would do to, but actually I would just use my wrist torque, but with a real wrench you have it right.

 

Boy, that seems like a lot of torque for a spark plug. I usually just hand tighten and then give her a bit of a good snug on my 5/8'" ratchet. I torqued her to 150 inch pounds and it really tightens the plug well beyond what I normally do. Sure don't want to brake off a spark plug.

 

Do you mean 25 Inch lbs. ?

 

I have two torque wrenches, one is for foot pounds ( which starts out at 25 foot pounds and goes up to 250 foot pounds) and a smaller torque wrench which is for inch pounds. The larger wrench will not go as low as 12 foot pounds therefore the reason for asking for the correct conversion from foot pounds to inch pounds.

 

You are right with your calculations. The book calls for 12 to 18 ft pounds. I always use the lower number. I also put some anti sieze on the threads. Where did you find a 5/8 Ratchet???

 

wrist tight plus 1/8 of a turn with a wrench works too.

 

You don't have a 5/8 ratchet?? I though everyone had one.
I meant to say 5/8 socket! Picky picky!