Several things contribute to the problem.
The bolts do not fit the sleeves tight enough. If the cams are not over tightened the sleeves will shift on the bolt. heard as a clunk in hard cornering force turns. especially transitions from side to side.
To cure issue number 1, we over tighten the bolts beyond their yield strength, thus loosing torque.
On budget builds, the suspension is not disassembled, the bolts seize in the bushings. When the cams are turned, the stress from being seized on the bushing puts even more strain on the bolts and the cam "teeth"
You must loosen the cams enough when adjusting.
You must hold the bolt when tightening the nut.
Failure to lube or at least have slippage between the nut and washer during adjustment
Because we over tighten the cams, they actually bend into a bowl shape. reducing the mateing surface between the washers and the subframe. So we over tighten some more.
Some times you can flip the cams over and get another allignment out of them.
We overtighten the bejesus out of these things because we are racing Barbie cars.
dave
Dave Wheeler
Advanced Autosports, the nations most complete Spec Miata shop
Author, Spec Miata Constructors Guide, version 1 and 2.0
Building Championship winning cars since 1995
4 time Central Division Spec Miata Champion car builder 2012-2013-2014-2017
Back to Back June Sprints Spec Miata 1-2 finishes 2016 and 2017
5 time June Sprints winner in Mazda's
6 Time Northern Conference Champion Car Builder
2014 SCCA Majors National point Champion car builder
2014 SCCA Runoffs winner, T4 (Bender)
2014 Central Division Champion, ITS (Wheeler)
2013 Thunderhill 25 hour winning crew chief
2007 June Sprints winner, (GT1, Mohrhauser)
Over 200 race wins and counting.
www.advanced-autosports.com
dave@advanced-autosports.com
608-313-1230