Moly lube vs 30w torque specs for arp studs

[cinciguy89turbo]

I am reusing arp studs, and it looks like they were used with moly grese I'm using 30w. What should I torque since they are combining? Arp says to still torque to 120...seems high.

 

[radiod]

Off ARP's tech section:

2. The lubricant used is the main factor in determining friction, and therefore, the torque for a particular installation. Motor oil is a commonly used lubricant because of it’s ready availability. If less friction is desired in order to install the fasteners with less torque, special low friction lubricants are available. With special lubes, the required torque can be reduced as much as 20 to 30 percent. It is important to keep in mind that the reverse is also true. If the torque value has been specified for a particular fastener on the basis of low friction lube, installing the fastener with motor oil will result in insufficient preload; the torque has to be increased to compensate for the extra friction caused by the motor oil.

Personally I just went and bought the ARP stuff. They made it for a reason, right? I got one for like 20 bucks and it will be good for many a rebuild after if necessary.

 

[JDMMA70]

You can get Moly Lube almost anywhere.

 

[adampecush]

you can also clean the old lubricant off the threads...you should be doing this anyway to eliminate any contaminants that will affect the frictional properties of the lubricant.

although it is counterintuitive, lubricated threads require significantly less "torque" than dry to result in the same clamping force.

 

[Keros]

Hit them with some WD40 to clean up the remaining lubricant... then use brake cleaner to get rid of any residue left behind by the WD40. Then it'll be squeaky clean.

 

[WhtMa71]

Yes that is right. It's that high because 30wt oil does not have the lubricating properties that their moly lube does.