| Author | Message | ||
     Ebrfan |
This is a bronze swingarm saver and chain rub I have been working on. I had 7 of these cut last week and finally got the tabs welded on them today for the installation. It utilizes most of the OEM chain rub piece, as seen in the pictures. "Some assembly is required". The chain was adjusted to 30mm deflection per the manual, and the first 50 miles of rodding on it shows very little marking on the bronze under heavy deceleration just like I had hoped. I'm going to let sag into the chain tomorrow, and let it stay that way for a while to see how it does for wear then. But because bronze has been used as a low wear rub material for many decades I have confidence this will keep the swingarm from being chewed up from a saggy chain. Keep in mind that this is not a rub to neglect proper maintenance. It is for a swingarm saver to offer a better, but still limited protection to a saggy steel chain eating a chunk out of the aluminum swingarm in an hours ride time. Let me know what you think. | ||
| Terrys1980 |
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| Ebrfan |
Pictures...  | ||
| Dannybuell |
That looks like a great prototype. very thoughtful engineering. What is the cost? was kostet es quel est le coűt quanto costa Cuánto cuesta コストは何で&# 12377;か چه هزینه است | ||
| Ebrfan |
Dannybuell, it wasn't exactly cheap but its cheaper than a swingarm for sure. Each piece cost me $82.15. The 954 aluminum bronze bar stock was $140.00, programming from my print and cutting 7 parts was $375.00, and welding was $60.00. Fuel running around for the material, welding rod, finding a welder, and my sweat equity not included. | ||
| Ceejay |
jeez that photo should be on a wall somewhere - it's art. nice work! | ||
| Ebrfan |
Thanks Ceejay. It is a pretty cool looking picture, isn't it! | ||
| 1_mike |
I needed one a happening a coupla months ago... Something got jammed in the tunnel area and trashed both the chain and forced the chain to grind into the "SIDE" of the swingarm. The newish chain would bend almost two inches...side to side in a 12" length..! It ground into the thin outer wall of the swing arm...almost going thru. Left aluminum dust all over the side of the bike and my pant leg/shoe. No other visible damage to the chain or the rest of the swing arm tunnel. All I can think of was it must have picked up a piece of tire tread and it jammed in there for a short period of time. I did feel something hit the "heal" of my foot on that side..! Mike | ||
| Ebrfan |
Mike, do you still have that chain? I could use it to experiment with side wear on this bronze rub if you don't want it. On my chain I have let slack into it for bottom rubbing, but it is still too new to have much of any side play. No matter how many circles I do in the parking lot I am not getting the super slack side rub I want to get into the side of the swingarm. | ||
| Stevel |
I think this is a great idea and you did a very good job. I would have used Delrin or another nylon derivative. It would be much less weight and less expensive. No matter what you use, it will be sacrificial and should be readily replaceable. Sounds like something that would sell quite well. Go for it. | ||
| Zac4mac |
Just got home from 3 days of pushing my RS to the limit at the Colorado Mile. I will be examining the rub when I pull her off the trailer, later today. The RS has a tad over 1000 miles and is on her 2nd EVR3 race chain, still on the original rub. Last year, I did the Colorado and Texas Miles, came home with 172.4 in Colo and 172.7 in Texas. Yesterday I had a 171, 173, (2)176 and best speed, 178.4mph. Hope for 180+ in Texas next month. Damn I LOVE this bike!!!! Z | ||
| Zac4mac |
Just saw a new post by Dan Hurda - Chain Slider Wear We are actively working on this issue and have some good data we are starting to make sense of, but I'm looking for a bit of feedback to help. If you are experiencing wear on the outboard side of the slider (not the bottom) please send email to Tech@EBR.com with the subject OUTBOARD WEAR Every indication so far is that wear to the outboard side of the slider has a different root cause than wear to the bottom. I'm only familiar with about a half dozen cases of wear to the side but I'd like to get more feedback (via email not Facebook) That is all Z | ||
| 1_mike |
Ebrfan - Maybe, will look. Mike | ||
| 1_mike |
Ebrfan - Looked all over, I guess I tossed it. Mike | ||
| Ebrfan |
Thanks for checking Mike. | ||
| Firemanjim |
Just talked to a friend today complaining of swingarm/rubbing block wear, will get more info from him. | ||
| Ebrfan |
Firemanjim, as you probably know, the chain rub is a wear item that needs to be changed out when worn. It just happens to wear more quickly on some bikes rather than others. Mine being one of them, and that is why I designed this part. So far so good as far as wear goes, and only adding a little more weight near the swingarm axle. EBR has unofficially helped a few guys out with the problem, but have not came forth with a determination as to why some bikes are more prone to block wear than others. | ||
| Zac4mac |
So, I agree that you have something here. I still have a new rub for when mine wears out, but I would LOVE one or two of your bronze units. BTW, home from 16 runs in Texas, disappointingly slow... more drag increase than power increase going down to sea level. Chain and rub look like when I left 2 weeks ago... adjusted chain 2 flats tighter before tech would pass me to run. | ||
| Dannybuell |
do you think those extra flats increased the chains frictional losses? | ||
| Ebrfan |
Zac, sorry to hear you had a disappointing weekend in Texas. I'm going to run one of the "miles" this next spring or summer on a slightly modified RX. As far as the rubs go, I had only made 7 of them and have not finished experimenting on wearing them out yet. I'd like to see their true longevity before dolling out too many prototypes. As you know, they do not fix the underlying problem of the chain getting into the swingarm. In the last 1000 miles they have proven to withstand an intentional 36-38mm of sag without hardly wearing into the bronze. There is 0.020" wear at most, and only where the links beat up the bottom of the rub on deceleration! | ||
| Zac4mac |
Danny - short answer no. I told tech I was going to tighten it, so they said to come back after with safety wire on the axle-nut. |
