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| Hydro and dry upper arms https://www.ausmini.com/forums/viewtopic.php?f=2&t=35993 |
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| Author: | Mick [ Sun Sep 23, 2007 2:38 pm ] |
| Post subject: | Hydro and dry upper arms |
Can anyone tell me what gives away a hydro upper arm from a dry apart from the mounted bumpstop? Measurements, obvious features etc.. I don't have two to compare against around the garage, and I have it from a hydro subframe converted to dry. I'd like to make sure I am refurbishing the right type of top arm... |
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| Author: | drmini in aust [ Sun Sep 23, 2007 3:56 pm ] |
| Post subject: | |
A dry arm has the shocky bolt hole a loose fit on a 3/8" bolt (I guess 10.0mm diameter). A virgin hydro arm has a hole about 8.5mm diameter. But if it's been drilled out it's hard to tell from a dry arm. If you have one of each to compare, the big knuckle joint hole on a dry arm is slightly closer to the top pivot shaft. 
Some racers use hydro top arms instead of dry, as it increases the spring rate a bit. |
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| Author: | Mick [ Sun Sep 23, 2007 4:09 pm ] |
| Post subject: | |
Yeah, I've checked the holes and they look pretty vigin with no signs of a dodgy drill going through or a burr. I'll have to see if I can find a dry arm to compare against. Now I've blasted the bare arm back, the number can be seen - 21A1480 so I'll see if I can't find a part number reference. EDIT: Well from the CD reference it has 21A611 and 610 (Right & Left). Though it shows a dry suspension in the diagram it is supposed to be for Cooper S as well....hmmm |
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| Author: | EST-071 [ Sun Sep 23, 2007 4:25 pm ] |
| Post subject: | |
In the Mini Kingdom book the number is close to a hydro one 12A1482 or 12A1479. Cheers Pete |
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| Author: | drmini in aust [ Sun Sep 23, 2007 4:28 pm ] |
| Post subject: | |
My Mini Car Clinic book says dry- 21A2690, 21A2691 hydro- 21A1479, 21A1482. |
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| Author: | Mick [ Sun Sep 23, 2007 4:35 pm ] |
| Post subject: | |
Definitely a 1480 on the arm I have blasted back, but will take that as a hydro from those numbers as they are far removed from the dry type numbers.The knuckle joint looks like it is spaced out a little further (6mm (ish)) from the inner edge of the machined pad. |
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| Author: | drmini in aust [ Sun Sep 23, 2007 5:18 pm ] |
| Post subject: | |
It was common BMC practice to make part numbers and casting numbers 1 or 2 apart. eg the C-AEA648 or 649 cam. |
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| Author: | Mick [ Sun Sep 23, 2007 5:30 pm ] |
| Post subject: | |
Yep that makes sense now that you have mentioned it. Thanks for the support. In goes the new needle rollers! |
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