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  View original topic: Beam bushing issues delrin AND urethane
Dibaltic Thu Jul 23, 2020 7:31 pm

Delrin
I bought two sizes of Pacific customs Delrin bushings totalling over $120 per this sites recommendation of delrin over urethane. Both press fit into the beam yet clunked (by hand) on install with zero reaming. Total pain to remove and useless waste of unreturnable money.



Urethane
Bought JBugs kit listed as for 2" 0.120 wall tubing which my beam is, did not fit. Upon arrival notice packaging says 46 mm but 2" 0.120 is 44.704m. shaved about 1.3mm odd before these pieces of garbage fit. Had I bought the 45mm kit for aluminum beam (per their site) I'd of only had to shave off 0.3mm which I feel is very reasonable for aftermarket parts and aftermarket setups. Plus I'd of saved $10 on top.of the $120 in bushings alone I wasted with Pacific customs (plus $100 reamer)





After reaming



In the future I would recommend either the urethane bushings for aluminum beam (anywhere) plus reamer from Pacific customs (or better yet spiral reamer) but most preferably the beam getting machined for needle bearings post welding.

dustymojave Thu Jul 23, 2020 9:54 pm

About 10 years ago, I had a customer who insisted that I replace his perfectly good stock needle bearings and micarta inner bushings in his ball joint beam and install delrin bushings. The delrin bushings he provided slipped very loosely into the beam tubes, yet at the same time were rattly loose on his arms. So I took them out and put the original bushings and bearings back in, at considerable effort to do without breaking the inner bushings or damaging the original bearings. Then after I told him I was not charging him for my time, he left in a huff because I had not installed the delrins.

Close measurements of the new are necessary BEFORE going to the effort of taking out old parts.

JBUGS.COM Thu Jul 23, 2020 11:54 pm

dustymojave wrote: About 10 years ago, I had a customer who insisted that I replace his perfectly good stock needle bearings and micarta inner bushings in his ball joint beam and install delrin bushings. The delrin bushings he provided slipped very loosely into the beam tubes, yet at the same time were rattly loose on his arms. So I took them out and put the original bushings and bearings back in, at considerable effort to do without breaking the inner bushings or damaging the original bearings. Then after I told him I was not charging him for my time, he left in a huff because I had not installed the delrins.

Close measurements of the new are necessary BEFORE going to the effort of taking out old parts.

The only reason(s) to use these bushings is in situations such as you are building a scratch beam and factory bearings are not available or don't fit. In those situations it is considered to be expected that the entire car is custom, and this product is a "clay" to make it all work together. Another possibility for them to be the correct option is that it is a one time use 1000 mile run suspension etc. I agree, the needle bearings are the best option for an air-bag car.

JWHracing Fri Jul 24, 2020 11:34 am

Sounds like a measurement issue on your end, not necessarily the seller's fault. I agree some of the descriptions on parts sites aren't great, but if you really want to get the right part, maybe you should pick up a phone and call and ask. The good shops where I'd want to spend my money I'm sure would be more than happy to help and tell you some measurements.

Usually when the beam bushings are installed into the beam, the bushing itself gets compressed and shrinks the ID of the bushing due to the press fit of the outside of the bushing inside the beam itself. This is what causes the need to ream the inner diameter after install.

I've also seen beam tubes that are ovalled instead of round due to warping after welding.

dustymojave Sun Jul 26, 2020 5:41 pm

VERY good response JWH.

kangaboy Mon Jul 27, 2020 8:32 am

I don't really understand the issue here...did you remove previous bushing/bearing, clean up the beam, and then measure the ID of each beam opening, and then base your purchase on your measurements?
Like was said above, you want to purchase the bushings based on the ID of the beam, and then if/when they compress when installed, that is where the reamer comes into play, and you can just ream them to the OD of the trailing arms.
I guess I just wasn't able to understand the issue in the original post.

jsturtlebuggy Mon Jul 27, 2020 1:15 pm

When I first saw this thread awhile back you had a video attach to it. From what I saw it look like the trailing arm was rocking back and forth in bushing.
What happen to the video?

One thing you are not showing is the trailing arms. Are they stock or aftermarket?
Have you measure the diameter of the arms? If so can you share your findings?
I have been using and fitted the blue, white and grey ones for many years now.
The white ones seems to be the best for cost verses wear. The gray ones are the best and wear like iron, though they are not cheap. And you need a real sharp reamer to fit them to size.
I buy mine from KarTek, they know off road and can give you answers that most other places, you are just dealing with a sales person that has no idea on what works.

66 Shorty Fri Aug 07, 2020 6:23 am

I just bought the Delrin bushings from Kartek myself. I'm waiting for their arrival... I have a ball joint beam that I'm using them in. They only had one size for them. I should be good I'm hoping... lol!

dustymojave Fri Aug 07, 2020 9:29 pm

Hell, I'm still trying to figure out what Jaime Marrison of J-Bugs is talking about "an air-bag car"... :roll:

kangaboy Mon Aug 10, 2020 7:16 am

66 Shorty wrote: I just bought the Delrin bushings from Kartek myself. I'm waiting for their arrival... I have a ball joint beam that I'm using them in. They only had one size for them. I should be good I'm hoping... lol!

For one reason or another, my bottom busing fit fine with the trailing arms in them, but I had to ream the top ones for the trailing arms to fit. Hope you get lucky if you dont have the reamer.

Matt Wilson Mon Aug 10, 2020 8:30 am

I had excellent fit with these Delrin bushings on a stock beam:

http://nectarlabs.co/shop-2/delrin-beam-bushings-ball-joint-beam/

Not sure if those guys are around anymore.

Also had good luck with red EMPI urethane.

I tend to agree with the Jbugs folks a bit, that almost any aftermarket parts nowadays, are about 80% there; you have to do the extra effort to get it up to 100%.



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