What is the typical size of a Trophy Truck lower A arm Delrin bushing?...They are typically a Nylon/Delrin type of thing right?...What size bolt also?....Thanks!
2" x .250 wall outer sleeve, 1.125" x .188 wall inner sleeve, 3/4 bolt. Delrin Bushings. Kartek has these bushing assemblies ready to go.
You bring up an interesting point..I was thinking the 3/4" hiem was not strong enough but if the bolt is the problem, I could just remove the 3/4" to 1/2" spacers and run a 3/4" bolt with some big 3/4" spacers..Its bolting the A arm to the chassis and has no need for the mis-alignment spacers...3/4" hiem is strong enough?...This is a truggy with a weight of 4000 to 5000 pounds when finished
I think the 5000 lb experts need to chime in here. Thats a lot of weight, and probably a 60/40 split front to back on the weight??? 3/4" might be on the margional side, but you have 1/2" bolts now, have you had any bolt breaking issues???? If not I think your good. Worry about it once you break something. I know, not the safest answer, but I am looking forward to a truck/truggy expert to chime in.
Well, a 1/2" grade 8 bolt if memory serves has approximately a 12000 LB sheer strength. 3/4" should be around 30K (somebody correct me if thats wrong) I've never calculated loads on A-arms before, but I've done quite a bit on 4-link rears, and for that weight vehicle I would guess load values to be considerably less than 12000 B, but perhaps not enough to satisfy specific requirements for margin of safety. If you are redoing everything anyway, I'd definitely step it up to at least 5/8". FWIW the '08 Ranger I just pulled apart had 5/8" LCA bolts. I was surprised (thought they'd be in the 1/2" range), but its an indication that 3/4 on a more abused vehicle wouldn't be overkill. On the other hand, OEM's have crazy margins built in...
A good delrin bushing will last you a long time. Typically longer then a spherical bearing will. We have seen the larger bushings like this last for almost a whole season of races (4 or 5 races) without wearing to the point of needing to be replaced. Also the surface area on the delrin bushing helps with keeping the bolts from bending. We always use them on the lower A-arm and then heims on the uppers so you can adjust a little for the camber, caster stuff. Everyone has good points on the bolt stuff too, but we end up with 3/4 bolts due to the fact that we have seen bending and shearing in 5/8 and less. Its the heavy hit accidental slam into a rock or big hole on the one wheel that spikes up and damages this type of thing. Even when the bolts are tight sometimes we would see the heads shear, just pop off the shaft of the high quality bolts. With the 3/4 overkill bolt you dont see it. So I guess we dont really know how much load ends up on one of those in a 100 MPH hit like that. Not sure if anyone has been able to really measure that well??? Anyone??? We are using a 2.25" Delrin bushing in our new TT stuff. The Swift 7200 Ranger has a delrin bushing too.... Anyway....How long does a Delrin bushing last in a high load suspension application, say compared to PU or rubber? or a SRE/uni?
I can see the beneft of the precise location, but curious about the wear characteristics. Maybe OK for a race-maintenence schedule, but not so hot for a play/road going car? Cheap and easy replacement is awesome for a race car, but might be too labor intensive for a 'rode hard and put away wet' play-mobile... ?
Is it noticeable harsher in shock transmission than polyurethane/rubber? softer/quieter than a solid bearing type connection?
So I guess we dont really know how much load ends up on one of those in a 100 MPH hit like that. Not sure if anyone has been able to really measure that well??? Anyone??? We are using a 2.25" Delrin bushing in our new TT stuff. The Swift 7200 Ranger has a delrin bushing too.... Anyway....