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aluminium bolts
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Posted by: arjay
I'm rebuilding my engine using 6mm 7075 hi-tensile aluminium bolts. The manafacturer says that they're strong enough to hold the crankcases together. Are there any issues regarding alu/alloy metal seizure over time? ie between bottom end rebuilds? (Max recommended torque is 5nm) Thanks for any advice.
Posted by: kuritaro9
i have some of those mixed with a few titanium bolts. i always put a little MILSPEC antisieze i "picked up" during my military time. never had a problem...watch the tourque on the aluminum though. they pop quick when pushed... 
Posted by: Jaybird
Bone up on torque values when an anti-seize is used.
Like kuritaro9 stated, the aluminum will not take any amount of overtorque, and using anti-seize (which you should do for certain) will mean you need less torque to get the bolt properly seated.
I think it's like 30% reduction from the dry bolt spec.
Someone will surely come in before I can look it up and state the exact ratio for coated bolt torques.
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