These bolts are typically a much smaller cross-section, high strength material
relative to stock bolts (to keep the rotating weight down) and the required
torque is lower. The bolts on the Carillo rods on my GT6 get only about 25 lb
of torque - probably smaller ones than on your TR4. Read the instructions
carefully - Carrillo specifies what type of lubricant to use on them at a
certain torque (I think some sort of loctite). I once used ARP lube, thinking
it was interchangeable. The ARP lube is much more slippery and the bolts were
over-torqued. You might try using a bolt stretch dial indicator instead of
tightening them to a torque setting.
Why is this important? Those fancy little bolts cost about $30 each if you
over-stretch one!
On Aug 15, 2011, at 5:04 PM, Alexandre Camoletti wrote:
Amici ! Currently building a TR3/4 engine with Carrillo rods.
The set came with the stock Carrillo bolts (called by them WMC/H11) and the
tech sheet says they must be torqued max 40lbs.
While the stock rods and bolts usually are torqued at 60 lbs.
So should I torque the Carrillos at 40 or 60 lbs then ?
Amici, thank you for your very valuable input (as always)!
Cheers
Alex
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