Torqueing rod bolts... Questions
Thread Starter
Joined: Apr 2006
Posts: 3,899
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From: Grand Rapids, Michigan
Torqueing rod bolts... Questions So, I torqued all my rod bolts on my Summit ProLS rods, according to their instructions. Two steps to 30 lb. ft. and then + 50 degrees. Using their supplied lube, of course. These are ARP 2000 bolts. All of the bolts had from 92 to 97 lb. ft. after performing the procedure, which seems kind of high to me. They say if torque angle can't be used, to just torque them in 3 steps to 82 lb. ft. My results are 10-15 lb. ft. higher. I don't want to distort the bearing bore, so should I crack these loose again and just torque them to the lb. ft. value? I did see that on their 6.098" rods, they call for 95 lb. ft. , so I can't imagine my results are out of line on my 6.125" rods, but I'd rather be safe than sorry.
I don’t think you have anything to worry about. The angle method is more accurate than going by torque. Sometimes the friction will be a little high on brand new threads and so it will make the torque higher. After a couple cycles of torquing the bolts, the threads “burnish” and it gets easier. I usually do three cycles before torquing for real and start measuring for clearances.
Thread Starter
Joined: Apr 2006
Posts: 3,899
Likes: 1,143
From: Grand Rapids, Michigan
Okay, that makes sense. This was on my second run through, and I did get slightly lower values ( 3-5 lb. ft. ) the second time. Just seemed a little excessive, but I do agree that torqueing to angle is a better way to go if you want to be sure you're getting correct bolt stretch.
