Ball Bearing Bushings for Fiero
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Ball Bearing Bushings for Fiero
What is your take on these bushings:
a guy on P. FF is selling them for 84'87 Fieros. Rear control arm bushings.
http://www.fiero.com/forum/Forum4/HTML/042116.html
$145 shipped.
a guy on P. FF is selling them for 84'87 Fieros. Rear control arm bushings.
http://www.fiero.com/forum/Forum4/HTML/042116.html
$145 shipped.
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Exactly. Complete waste of money IMO.Xanth wrote:Interesting idea, seems like overkill. Why complicate such a simple part?
And they never require maintenance during their entire lifetime? How long is their lifetime? The wheel bearings on my nitro RC car are of the same type, just in a smaller scale, and those only last 1 season, if that.
Im sure he's tested these for a couple years though :bs:
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I don't think I would've used such a small bearing. When cornering at 1g, those things are going to be loaded pretty close to the static load rating, and the big issue is that those bushings can get hammered pretty hard if you hit a bump on a corner. Ball bearings don't work as well when the race has a bunch of dings in it.
A+ for the idea...C for execution.
A+ for the idea...C for execution.
This part doesn't seem to be for true-performance though. Its more of a symbolic gesture. Also much cheaper than getting an 88 cradle.Pyrthian wrote:yes, roller/needle bearings would have been a better approach - but - again - if you are squeezing out every last dime of handling - would you not go with a '88 cradle.....
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In this app, these bearings do NOT take the static weight of the car and jounce/rebound loads. To a first order estimate, they only take cornering loads.
I've seen '88 rear cradles as low as $300...
The S1 through S3 Jaguar XJ-6's use both needles and tapered rollers in their rear suspension. It's an arrangement somewhat similar to Corvette rear suspension. They have a suspension cage which is rubber mounted to the chassis. The diff (Salisbury) is hard mounted to the cage. The axles use a pair of universal joints and have static length. The LCA is an H-arm pivoted at the cage with needle rollers. These bearings last forever. The H-arm has dual coil over shocks mounted to it and is pivoted at the hub carrier with tapered rollers. These bearings need to be replaced about every 30-40K miles. The cars weigh ~4,000# and handle very nicely.
So in the Jaguar, the bearings DO take static vehicle weight, jounce/rebound loads AND cornering loads. They also have very limited servo type motion. The needle do just fine and the tapered rollers suck. My dad recently re-engineered the outer joint to take rollers, so we'll see how that works out eventually.
The Jaguars also have inboard mounted brakes, so the brakes end up being SPRUNG weight. They ride extremly well.
I've seen '88 rear cradles as low as $300...
The S1 through S3 Jaguar XJ-6's use both needles and tapered rollers in their rear suspension. It's an arrangement somewhat similar to Corvette rear suspension. They have a suspension cage which is rubber mounted to the chassis. The diff (Salisbury) is hard mounted to the cage. The axles use a pair of universal joints and have static length. The LCA is an H-arm pivoted at the cage with needle rollers. These bearings last forever. The H-arm has dual coil over shocks mounted to it and is pivoted at the hub carrier with tapered rollers. These bearings need to be replaced about every 30-40K miles. The cars weigh ~4,000# and handle very nicely.
So in the Jaguar, the bearings DO take static vehicle weight, jounce/rebound loads AND cornering loads. They also have very limited servo type motion. The needle do just fine and the tapered rollers suck. My dad recently re-engineered the outer joint to take rollers, so we'll see how that works out eventually.
The Jaguars also have inboard mounted brakes, so the brakes end up being SPRUNG weight. They ride extremly well.
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for such short motions and high loads i wouldn't put anything but needle bearings in there. balls have higher point loads and in such short motion as our suspensions have most of the time they would develope flat spots on the balls or pits in the races quickly. needles would be fine because they have such a smal diameter they are able to fully roll around.
a lot of work and expense for something that doesn't work any better in the fiero than lubricated poly. (its really easy to add a grease fitting to the swing arms for poly bushings.)
a lot of work and expense for something that doesn't work any better in the fiero than lubricated poly. (its really easy to add a grease fitting to the swing arms for poly bushings.)