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LS head bolt comparison

Fu Manchu

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I think quite a few of you will be interested in this one.
 

lmoengnr

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I wonder how much they paid for all the dial indicators? :D
 

Fu Manchu

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Not sure. They seem to be quite impartial with their tests.
The ARP head stud was donated. I recall in a video leading up to this one, they asked if anyone had one they could give them because they couldn’t source one.
 

immortality

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I watched that video and it was interesting but there is something I think they potentially missed with the use of the ARP fasteners.

Taken from the ARP catalogue.

"1. The friction factor changes from one application to the next. That is, the friction is at its highest value when the fastener is first tightened. Each additional time the fastener is torqued and loosened, this value gets smaller. Eventually the friction levels out and becomes constant for all following repetitions. Therefore, new fasteners should be tightened and loosened through several cycles before applying final torque. The number of times depends on the lubricant. For all situations where ARP lubricants are used, five cycles are required before final torquing."
 

07GTS

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I watched that video and it was interesting but there is something I think they potentially missed with the use of the ARP fasteners.

Taken from the ARP catalogue.

"1. The friction factor changes from one application to the next. That is, the friction is at its highest value when the fastener is first tightened. Each additional time the fastener is torqued and loosened, this value gets smaller. Eventually the friction levels out and becomes constant for all following repetitions. Therefore, new fasteners should be tightened and loosened through several cycles before applying final torque. The number of times depends on the lubricant. For all situations where ARP lubricants are used, five cycles are required before final torquing."
another i just realized is that the bolts arnt at say 90-100c+ operating temps
 
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