Spindle Hub Delfection
1st Gear Member
Joined: Sep 2008
Posts: 60
From: Arizona
Spindle Question/Clarification
My question:
Is this also concern for those of us doing only Autocross/Solo 2 on street
tires.........although large (275) sticky street tires (Dunlop Direzza's or
Nitto NT-05's)?????????
Thx,
Is this also concern for those of us doing only Autocross/Solo 2 on street
tires.........although large (275) sticky street tires (Dunlop Direzza's or
Nitto NT-05's)?????????
Thx,
Last edited by azrampage; Jul 26, 2009 at 02:12 PM. Reason: typo
4th Gear Member
Joined: Dec 2007
Posts: 1,692
From: Ontario, Canada
I'm sure the prices in the US will be better than here in Canada - they usually are.
6th Gear Member
Joined: Feb 2007
Posts: 7,635
From: state of confusion
I don't know about the bearings, but the knuckle failures appear to be centered around insufficient clamping force in the strut/knuckle bolts. Given any room to move, fatigue failure of the knuckle becomes only a question of when. The fixes that I know of include fine thread bolts with higher torque specs and the newer knuckles with slightly thicker pad thickness.
Insufficient clamping force has a number of possible causes, inadequately torqued fasteners, fastener stretch/relaxation in service, excessive clearances in the joint being bolted together . . .
What I hear from Sam Strano is that Ford's 140-whatever torque spec is pretty low for strut bolts on a ponycar.
Separately, camber bolts are more likely to stretch (since they have a smaller cross section over part of their length).
Norm
Insufficient clamping force has a number of possible causes, inadequately torqued fasteners, fastener stretch/relaxation in service, excessive clearances in the joint being bolted together . . .
What I hear from Sam Strano is that Ford's 140-whatever torque spec is pretty low for strut bolts on a ponycar.
Separately, camber bolts are more likely to stretch (since they have a smaller cross section over part of their length).
Norm
4th Gear Member
Joined: Dec 2007
Posts: 1,692
From: Ontario, Canada
I just picked up my new bolts from the Ford dealer. They come in a set of four bolts in one package under PN W714652-S439 and four of the flag nuts in another package under PN W714653-S900.
Quote from post #37 on this thread
http://forums.corner-carvers.com/showthread.php?t=41225
"The bottom line is that these bolts need to be regularly checked for proper torque. The course thread bolts need 200 nm /148 ft lbs. The newer fine thread bolts go to 225 nm /166 ft lbs. It would probably do good for anyone racing/autocrossing an S197 to get the newer bolts sooner rather than later."
Monday I'm at Mosport. Details and video to follow.
Quote from post #37 on this thread
http://forums.corner-carvers.com/showthread.php?t=41225
"The bottom line is that these bolts need to be regularly checked for proper torque. The course thread bolts need 200 nm /148 ft lbs. The newer fine thread bolts go to 225 nm /166 ft lbs. It would probably do good for anyone racing/autocrossing an S197 to get the newer bolts sooner rather than later."
Monday I'm at Mosport. Details and video to follow.
Last edited by Sleeper_08; Jul 28, 2009 at 08:24 PM.
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