I was just looking at some pictures of the rear suspension of an Escort WRC, but I can't really see what would cause bump steer on it. The two arms running from the knuckles to cradle near the diff are the same length and run exactly parallel. So when they move up and down the toe shouldn't change. The arm that connects the knuckle to the front of the cradle will push the knuckle back a bit when it's completely horizontal and pull it a bit forward when it's not horizontal. But this would only change the caster of the wheel and not the toe. So can you explain why this design is not good?
Originally Posted by
ian sibbert
Some would argue the Cradle/McPherson upgrade wasn't as good as the later beams and trailing arms, one major improvement though was the use of same hub on each corner so less spares to carry....bump steer on the cradle setup was horrendous out of the box!!
BTW, what is different on the later beams and trailing arms compared to the earlier ones? In the Escort Cosworth Group N and Group A manual nothing is mentioned on the beam and arms being a different geometry.