R. Phillips
Member
- Sep 10, 2002
- 19
- 0
I plan on doing a top end this winter, but wondered how in the heck I was going to torque those recessed nuts on the bottom of the cylinder head. I've got a torque wrench and didn't want to buy a "specialty" one, just for this job.
So, I remembered I had this formula in an old training manual.
If you add an "extension" to your torque wrench (90 deg off the handle) it has no effect on the reading.
BUT if you add an adapter i.e. open end or boxed end, which in effect extends the length of the torque wrench, you will be exerting more torque on the bolt/nut than what the torque wrench is reading. This is not good when torquing into aluminum.
Also, you have to keep the adapter in line (parallel) with the torque wrench handle. If not the torque changes.
Here is the formula for using an adapter you can get at the parts store, and use on your old torque wrench:
Tw = Ta x L
........ (L+A)
Tw = Torque wrench scale reading (what to set torque wrench to)
Ta = Torque exerted at end of adapter (torque needed on nut)
L = Lever length of torque wrench (middle of handle to head)
A = Length of adapter (hole to hole)
You guys may know all this already, I haven't seen it posted.
Hope it helps someone.
Robert
So, I remembered I had this formula in an old training manual.
If you add an "extension" to your torque wrench (90 deg off the handle) it has no effect on the reading.
BUT if you add an adapter i.e. open end or boxed end, which in effect extends the length of the torque wrench, you will be exerting more torque on the bolt/nut than what the torque wrench is reading. This is not good when torquing into aluminum.
Also, you have to keep the adapter in line (parallel) with the torque wrench handle. If not the torque changes.
Here is the formula for using an adapter you can get at the parts store, and use on your old torque wrench:
Tw = Ta x L
........ (L+A)
Tw = Torque wrench scale reading (what to set torque wrench to)
Ta = Torque exerted at end of adapter (torque needed on nut)
L = Lever length of torque wrench (middle of handle to head)
A = Length of adapter (hole to hole)
You guys may know all this already, I haven't seen it posted.
Hope it helps someone.
Robert