In a message dated 9/25/2001 8:47:06 AM Central Daylight Time, LBC286@aol.com
writes:
<< Can anyone give me a simple explanation as to why it may or may not be a
good idea to replace grade 5 with grade 8? >>
Cost, and the embarrassment of proving one doesn't know what they are doing
are 2 reasons which immediately come to mind as why one shouldn't use grade 8
anywhere in a car except maybe the driveshaft.
Using grade 8 in any stressed engine part is foolish, they are not strong
enough. Use ARP or SPS bolts instead.
Using a grade 8 bolt to hold a fender on is pretty ridiculous too. It's the
equivalent of telling people that one uses racing slicks, on the street,
because you want to go faster. It may impress 15 year olds, but those who
know, just laugh.
Fasteners work by stretching, do you really need a yield strength of 120,000
psi to hold that plastic MG fuse box in place or is that going to seem just a
little foolish?
Check out the ARP website for more info on bolts and how they work. Also see
Carroll Smiths books.
Ron
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