Not sure where you get your info from, mine have R142RS bearings with a load rating of 1735 lbs each. Made by F15Falcon down in Texas. The tube is CNC machined and has a step inside to support the bearing (unlike the crushed-tube design of Opentracker and Daze). The tube is mig welded to the saddle and has cutouts to make for easier access to the shock mounting nuts. The bearing are held in with snap rings, very easy to replace if needed. I would think twice about running these with bias-ply or belted tires, but with radials, no problem.
this is the setup i used...the before pic. and replacement parts. Falcon spring perch Falcon pin 1 brass center bushing 2 needle bearings. ...check out the pin...it ran in the brass bushings in a '60s falcon... ......
The bushing is enough to handle the shock loads and the needle bearing won't start taking any shocks until the busing begins to wear. That will be a long lived part but it will still transmit road shock to the drive train. I owned a couple of Falcons and raced one - found out the hard way what that kind of shock does the the lower control arms - I ended up breaking two of them! The R142RS and the 6303 2RS is the same bearing. Just different number system. All you have to do is run a search on the bearing part number and find the engineering specs.
Exactly. Learn to read... http://www.dynaroll.com/cgi-bin/xspec.exe?BasePartNo=R14&Type=2RS Part Number R142RS Material 52100 chrome steel Bore (d) 0.8750 in (+0-0.0004 in) O.D. (D) 1.8750 in (+0-0.0005 in) Width (Ws) 0.5000 in (+0-0.0050 in) Fillet radius 0.031 in Dynamic load rating (radial) 1735 lbs Static load rating (radial) 1110 lbs Retainer type J No. of balls 10 Ball diameter 1/4 in So, have you personally ran roller spring perches and encountered the problems you are alluding to? Or is it that your brother's friend's uncle overheard in a bar that they are no good? I have been using them for a while now and in my experience they have worked well. This isn't new technology. Road racers have been doing this for 30 or more years. Drag racers use them so that the front end lifts more consistently for better weight transfer. Their loads are a lot harsher than anything we will subject the bearings to, and I don't hear about them breaking. Is it overkill for 95% of the people running our cars? Probably. In my case, the last set of perches I bought at a local parts house were "Made in some country where English is a foriegn language" and lasted less than 10,000 miles. I wanted something better, found these on sale, and with my Christmas bonus in hand, decided to splurge. When you have some personal experience with the product, then you should comment.
bmcdaniel, From the bearing website you linked to: MAXIMUM STATIC LOAD Co When subjected to an excessive load or shock, rolling bearings may incur a permanent damage to the raceways, called brinelling. This occurs when the elastic limit of the raceway material is exceeded and will permanently effect the smooth rotation of the bearing. My comment: The bearing in question is a ball bearing and is not allowed to rotate beyond the few degrees of the angular deflection of the upper control arm. That means impacts are always in the same place. The maximum static load rating of a bearing (Co) is defined as that load which will produce a contact stress of 609,000 lbf /in2 (428 kgf/mm2) between the rolling element (ball) and the raceway. The values of Co are listed in the bearing tables for each individual bearing. Exceeding this value will damage the bearing. My comment: there is no static load on these bearing in this application. They don't rotate so the "static" load is just the weight of the vehicle, on the front wheels, at rest and always with the same contact point. At 60 mph (88 fps) the impact of hitting a 1" pothole or a 1" rise is equal to the weight times the velocity squared. 88 x 88 x 1020 = 7898880 ft. lbs. if you divide that by the area of contact of one or two balls it is (two ball contact) 789880 / .06 = 131,648,000 foot pounds per square inch. That is over 21 times the maximum load for this bearing. MAXIMUM STATIC LOAD Co In most cases, the actual load applied to a bearing is a combination of fluctuating radial and axial loads which cannot be directly used for fatigue life calculations. Instead, the Equivalent Load (P) is used. This represents the hypothetical load of constant magnitude, passing through the center of the bearing, that would give the actual observed bearing life when used in the fatigue life formula. It is an estimate, dependent on the initial ball contact angle αo and the static capacity of the bearing Co, as well as the actual load applied (F). This equivalent load does not even apply to a non-rotating bearing. There is no "equivalent load" associated with this application because all of the load is with the bearing not moving and constantly under impact loads. Any questions on the math? Yes I have used roller perches and yes they make noise. I already stated that I owned two Falcons that had the bushed perches and that the continuous impacts ended up fracturing the upper control arms. They are the only cars I have ever had those fractures happen under any circumtances.
I agree that the early falcon spring perches with the bronze bushings were a great idea if you kept them lubed. Ford didn't switch to the molded in rubber for any reason other than it was cheaper and it gave them a market for replacement parts. It's all about money!!! I did't use any of the available roller perches or the kits to do it yourself. I took new perches, found my own bearings and made my own(my own design). I don't think the noller bearings failing will ever be an issue. If they fail they can be replaced cheaply enough. RS
As mentioned, I got them a few years ago when they were cheaper and on sale... http://cgi.ebay.com/ebaymotors/ws/e...0485218301&viewitem=&sspagename=STRK:MEWAX:IT
fordsforever; what bearings did you use? is that the stock sleaves from the rubber bushing? or did you weld in new sleaves? I'd appreciate some details, thank you.
The sleeves that came in the perches were a little small for the bearing I used so I had to increase the size to fit. The sleeves are welded in place. The bearings are inserted and the ends of the sleaves are just rolled over the bearings to hold them in place. The sleaves are still smaller than what Opentracker uses. On theirs there is not much left of the perch once you cut the hole out for the sleave. It's possible that may weaken the whole structure depending on how good of a weld job yoiu do. I didn't have to cut as large of a hole. Plus on theirs you have to either notch the sleaves or dent the sides in to get to the bolts that attach the shocks. Mine doesn't have that problem. I didn't install grease 'zerks but could have. I used 6003-2Rs bearing which are a smaller O.D. and smaller I.D. As you can see from the 2RS they are sealed both sides which means they don't need to be greased. The spring perches I got from CJ Pony and were polurethane. I was hoping the urethane was the replaceble kind--NOT! The urethane is molded onto the shaft just like the standard perches. So they are just as stiff if not more so than if they were just rubber. I had to dig out the urethane to get the shaft out. Because the bearing had a smaller I.D. than the shaft I turned the shaft down to fit the bearing. Hopefully that doesn't weaken the shaft. But i don't think it will be a problem. The bearing are only about $6 apiece so they are not expensive. Because I rolled the ends of the sleaves over the edge of the bearings, should one fail it's a matter of unrolling the lip and replacing the bearing. Haven't installed them yet so can't comment on performance. Soon, real soon I hope. RS
I bought some roller perches and installed them 2 days ago... my god what a great improvement... should be the first thing anyone does when rebuilding the front of one of these cars.
i;ve seen these too openroad track or something of that sort.. would you even need these anymore if you have por convert to a coil strut mount setup?
