I agree with you that at first glance the application of reciprocating
needle bearings seems questionable. In reality, they seem to work quite
Perhaps the U joint needle bearings are one of the most common &
successful uses of them in a non rotating application.
In the case under discussion, I believe Cape's "Steering Trunion
Bearings" is the same as the AH Spares bearings, I doubt that the cost
of special bearings & their fitting would offer enough improvement to
be of benefit. The original bearing design is fairly low friction &
offers long trouble free life. The weight of the car is not against this
bearing so it is not heavily loaded. I doubt that steering effort is
Bob Spidell wrote:
>I am totally unqualified to answer this question, but that's never
>stopped me ;)
>Generally, I have heard--and this makes mucho sense--that needle
>bearings aren't a
>particularly good idea on (for lack of a better word) "reciprocating"
>pivots. Usually, this
>is in reference to using needle bearings on valve rockers, but the
>principle is the same:
>since the bearing doesn't rotate completely about the shaft, the needle
>essentially rocking back and forth on the same limited surfaces (also
>"concentrating" the friction and pressure on less surface area than for
>Obviously, this can cause excessive localized wear, even to the point of
>grooves in the shaft or flat-spotting the bearings themselves.
>Given that the bushes are (should be) regularly lubed with quality
>grease (I don't think
>they're oillite, BTW), I'd expect them to last 100K miles or more. The
>might make steering a teensy bit easier, but who doesn't need a little
>Tom Rech wrote:
>>I'm thinking about rebuilding my front suspension and using the AH Spares
>>needle bearings (I'm assuming they're needle bearings) in place of the
>>original oillite washers. Before I buy, I would like to hear the list's
>>opinion. Are they worth the expense?