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Thread: The "bomb proof" diff mount

  1. #26
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    Quote Originally Posted by FernandoBunster View Post
    Great design and manufacturing but I'm not sure that this is not overkill. My OEM diff mounts seem to l last many hundreds of thousand miles and are relatively cheap and easy to replace.
    I believe he is intending this for folks with better than stock power and I assume "boost"

    I am very interested in this design and implementation, but I don't have a use for it myself as my OEM mount was replaced at some point and has no issues after all these years.

    Keep up the good work GI!
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  2. #27
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    Mount looks awesome and certainly look forward to some R&D on it and a final. Do I need it negative...but choices in our limited product offerings outside of OEM is near zero.
    alpinweiß on anthrazit buffalo 1984 745i, 2014 Fiesta ST, 1984 635csi 1986 635csi 1987 L6 1999 M coupe 2002 M3 1995 325i 1976 200​2, 2001 996 TT 1994 850 T5 wagon 1998 GTi VR6 1983 scirocco

  3. #28
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    Looks like the dangerous roads of Afganistan could not hurt it !!!!
    I will always own a BMW.

  4. #29
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    Great design and manufacturing but I'm not sure that this is not overkill. My OEM diff mounts seem to l last many hundreds of thousand miles and are relatively cheap and easy to replace.
    I believe he is intending this for folks with better than stock power and I assume "boost"

    Exactly.Nothing is for everyone.Unless by chance it turns out that everyone sees some notable instant advantage in testing,even then....

    I did this for myself and am simply offering it to those who want it enough to buy one.In all honesty this will most likely be a limited run even if it is popular,we will see.At the moment between two forums i have been assaulted with requests to buy a test unit overnight so clearly there is some desire out there,whether people "need" it or just want one

  5. #30
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    87-635 '78-R80/7 '96-960
    I think it's great trying to improve a weak link. I filled my mount with "Window Weld" all the way to the top. Can lift by the diff & it doesn't give or flex.

  6. #31
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    Just letting everyone know that everything is on schedule at this point.Got all the units done,just waiting on the bushings.Ill post pics and details tomorrow!

  7. #32
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    Well after a bit of a fiasco with the bushing supplier I have finally received them and have 8 units done and ready to go out on Monday.All who requested a test unit will get a PM soon and I still have a couple left for any additional people who want one.

    Here are the pics of the revised design.The only promise I did not come through on is making able to accept the stock fasteners,no biggie,they will come with new ones.As you can see, lateral movement is a thing of the past.


















    [/img]

    Also here are the specs on the bushing that i ended up settling on.There are likely others in this size that people can source if they want to experiment.# 9.9482.They are $14 for a set of 4.


    http://energysuspension.com/universal-pr.....-mounts-isolators.html

  8. #33
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    that looks very good
    Last edited by DCpower; 03-04-2012 at 02:07 PM.
    BMW collector
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  9. #34
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    Can't wait to get this in, hopefully it gets here before I go on my trip Friday. I just got my car back to 100% today so this will be great to try out.

  10. #35
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    I want to buy this... Please let me know if you sell it.

  11. #36
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    in my laundry list of projects is an LSD, would be a good idea to source this as part of the project, let me know if/when production starts, and if you have any additional units left over thanks!
    5/1984 633csi 5-speed, delphin metallic, red leather, BBK, euro turns, style 5s, thule "555" & rack

  12. #37
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    The good thing about this part is it'll also work for 5 and 7 series...

  13. #38
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    Let me know when I can get in line for one. It would be a test/spare for the car, wouldn't be able to use it immediately.

    Erik Brannfors
    RedShark Racing http://www.brannfors.com/
    1988 M6 #71, SPM
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  14. #39
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    E24 633csi, E24 635csi
    this looks awesome!
    Past: 1984 633csi / 1985 635csi / 1991 318i / 1987 325e / 1988 325is / 1986 325i / 1985 535i

  15. #40
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    1985 M635csi, 97 HD fatboy with stroker motor
    Well, now I want one to!

  16. #41
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    Got mine! Unfortunately it's raining quite a bit today and I'm getting ready to embark on a drive to Washington state with my family so I won't be able to install it until the 19th or so.

  17. #42
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    '86 M635/'10 Clubman
    I also just replaced my diff mount last year, but I'd consider buying it if we think it is stronger and lighter than the OEM part. Any opinions?

  18. #43
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    Its not lighter.Ive been meaning to weigh the two on the digi but Im guessing 50
    % heavier than stock.

  19. #44
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    I'm back home now, going to try to install it this afternoon. We've got thunderstorms rolling in so hopefully I can get it done before that.

    Got it installed. Pretty happy with how it feels. When giving it gas or letting off it has just the right amount of bounce that it's not harsh, it feels very much like the OEM mount but now I know it's a lot stronger (my entire drivetrain is held in by urethane so I can judge the bounce of the rear mount fairly accurately since I know it's not the drivetrain moving). If I ever get around to turboing it will be nice to have the rear end all sorted already.

    Anyone want mine now that my car is dead?
    Last edited by AdamBath; 03-19-2012 at 04:26 PM. Reason: Automerged Doublepost

  20. #45
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    Anyone want mine now that my car is dead?
    Last edited by AdamBath; 03-20-2012 at 11:27 AM. Reason: Automerged Doublepost

  21. #46
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    Quote Originally Posted by AdamBath View Post
    Anyone want mine now that my car is dead?

    Reading this after re reading your previous thread about not being able to install it because thunderstorms rolling in. Incredible that those storms then, would be the demise of your car today. Was the rain that you had the accident in the result of that storm you spoke of? Just so spooky.
    Such sad news but glad you are alright.
    Last edited by carsnplanes; 03-20-2012 at 12:05 PM. Reason: Automerged Doublepost
    '88 635, '92 325IC

  22. #47
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    Quote Originally Posted by GI Jonas View Post
    Well after a bit of a fiasco with the bushing supplier I have finally received them and have 8 units done and ready to go out on Monday.All who requested a test unit will get a PM soon and I still have a couple left for any additional people who want one.

    Here are the pics of the revised design.The only promise I did not come through on is making able to accept the stock fasteners,no biggie,they will come with new ones.As you can see, lateral movement is a thing of the past.


















    [/img]

    Also here are the specs on the bushing that i ended up settling on.There are likely others in this size that people can source if they want to experiment.# 9.9482.They are $14 for a set of 4.


    http://energysuspension.com/universal-pr.....-mounts-isolators.html
    Firstly, when I first looked at this post today I was hoping it was for the sideloader diff. Alas, your fine workmanship won't fit my old girl.

    Secondly. As a structural engineer working in the marine environment where constant movement always leads to fatigue failure I can not help but notice the proximity of two of the four chassis bolts to the edge of the black base/mounting plate. In Australia there is a standard that gives edge clearances to bolt holes in steel base plates. The distance from bolt hole edge to plate edge looks well under sized. I won't discuss all the nasty things that can happen if these distances are not maintained. May be something to look at if you consider a re-design in the future.

    Okay, a quick google search has found what appears to be the US standard for bolt edge distances. Given we don't use inches, but millimetres, I have no idea if you comply.

    http://www.structuralsteeldetailer.u..._distance.html
    1977 633 CSi RHD Euro. S38B38 3.9L M5 Transplant. 5 Speed Getrag Dogleg. 3.73 LSD. 417hp, 369lb/ft
    1971 3.0CS E3 2dr Alpina Special Coupe Racer, 347hp, 295lb/ft

  23. #48
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    You have a good point and I was planning on resolving that on the next batch.It was something I didnt account for in the dimensions and has bothered me a little...though I think it maybe alright in reality...could be wrong.

  24. #49
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    Don't get me wrong. I think your effort is fantastic. If my 633 was not the old E12 chassis with the sideloader diff I'd buy one of yours myself (with the altered bolt pattern). Note that your original mock up and your drawing along with the first one the manufacturer supplied you with appeared to have sufficient bolt clearances. I think they just got a little lazy when they manufactured the second run.

    This will only be an issue if bolts get loose so every 10,000 mile service should also check diff mounting bolt tensions. A loose bolt hits against the bolt hole as bolt holes are generally 1mm to 2mm larger in diamaeter than the receiving bolt. So that play can cause areas of high stress that lead to cracking, crack growth and failed diff mounts. My sideloader went that way, cracked along the bolt line due to loose bolts.

    Again mighty impressed with your effort.
    1977 633 CSi RHD Euro. S38B38 3.9L M5 Transplant. 5 Speed Getrag Dogleg. 3.73 LSD. 417hp, 369lb/ft
    1971 3.0CS E3 2dr Alpina Special Coupe Racer, 347hp, 295lb/ft

  25. #50
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    '85 635 CSi Euro 5sp.
    Any updates on this?
    Dean
    Lutz, FL

    '85 635 CSi Euro #9402254
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