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Roughen those head bolt washers

http://www.enginelab... Interesting but does it apply to TTY bolts where perhaps the final torque angle might take into account the washer turning especially those I have seen with radial lines under the bolt cap obviously designed to ensure the supplied washers turn with the bolt e.g. these http://i.imgur.com/o...

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Yes it does apply to TTY bolts: "Another roughly 30- to 35-percent is used to overcome friction in the threads. This leaves around 10- to 15-percent of the remaining torque to stretch the bolt and create the desired clamp load."
As story about TTY bolts.
About 8 years ago when TTY bolts were relatively new a bloke I know of spent a lot of money getting a motor built for the WRC round of the ARC.
Being the non-trusting untrustworthy person he is, he had his mechanic pull the brand new motor down to make sure the work he paid for was done.
After a couple of rally stages the motor destroyed itself.
There was much swearing and talk of suing the engine builder.
The engine builder dismantled what was left of the motor and his first question to the owner of the car was " who pulled the motor down and rebuilt it with the used stretch bolts?"
This was the first time the owner had ever heard of stretch bolts. Karma can be a b!tch.
David

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Old is good.

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