Is torquing used bolts to 30ft lbs the same as torquing new bolts to 30ft lbs? The only difference between the used bolt and the new bolt is the stretch correct?

 

id say that you would have to torque an older bolt a little more than a new bolt

 

I think torque specs are for new, non-lubricated bolts. However, I don't think I've ever seen instructions on what to do when contaminants or lube are introduced.

I also don't think most bolts are designed to permanently stretch. So if they did stretch, you should probably get new bolts.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lsos &raquo;</TD></TR><TR><TD CLASS="quote">I think torque specs are for new, non-lubricated bolts. However, I don't think I've ever seen instructions on what to do when contaminants or lube are introduced.

I also don't think most bolts are designed to permanently stretch. So if they did stretch, you should probably get new bolts.</TD></TR></TABLE>

Torque specs are not usually for dry bolts. Thats why you need to make sure you use the correct lube that the manaufacturer of your bolts has recomended. For OEM bolts just use engine oil.

 

Reason why I'm asking is that I'm in the process of building my block. When I plastigaged my main bearings I used my old main studs. I decided to not re-use my old main studs and bought new OEM main studs.

I'm not sure if the new main studs will change the way my bearings were plastigaged. For example, I don't want to put my new studs in if it's going to make the bearing clearances tighter. That's why I was wondering if as long as I torque the new main studs to factory torque specs it shouldn't change the plastigaged value of the bearing as long as I don't exceed the torque spec correct?

 

Sorry but first off unless something has changed recently you have bolts not studs.

The bolts will not change how much clearance you have on the bearings. Think about it, you are clamping the girdle not crimping it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1992Si &raquo;</TD></TR><TR><TD CLASS="quote">
The bolts will not change how much clearance you have on the bearings. Think about it, you are clamping the girdle not crimping it.

</TD></TR></TABLE>

In this case it probably wont make a difference as the same clamping force will be present. But if you were to change to ARP's then that CAN change the clearances. That's why an align hone is nessesary when aftermarket studs are used.