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  1. #1
    Join Date
    Jan 2014
    Location
    High Wycombe
    Age
    56
    Posts
    751

    Exhaust mount rubbers (bobbins).

    Afternoon all,

    couldn't find a definitive answer in search so a quick question about side exhaust mounts (bobbins).

    Which to use Mini (as in the car) or Land Rover?

    I have some Mini ones, new in a box, but they look a bit on the small size so thinking of getting some Land Rover engine mounts from Rimmer Bros' like these https://rimmerbros.com/Item--i-STC434P . Any views on which to use, exhausts are 4 inch stainless steel?

    Thanks, Graham.
    AK gen 1 delivered 05/05/17, on the road shortly!

  2. #2
    Join Date
    Sep 2010
    Location
    Cambridge
    Age
    36
    Posts
    1,209
    Hi Graham

    I've used mini ones on mine, 7 years in no probs. Just like you I also looked at the landrover ones, they are absolutely enormous in comparison and I reckon very definitely overkill for an exhaust, so beefy I used one for my gearbox mount.

    regards

    Dave A

  3. #3
    Join Date
    Jun 2004
    Location
    Northampton
    Posts
    1,879
    I suppose the point here is the purpose of the rubber bobbins-to flex. Too small and they will flex too much and separate. Too large they won’t flex and produce fractures “up stream”. Also it must depend on how much the engine rocks on large throttle changes which must vary from car to car. Pays ya money, takes ya choice I guess.
    Dek

  4. #4
    Join Date
    Mar 2007
    Location
    Maldon Essex
    Posts
    368
    Interesting, I was going to move away from these and try to find something that has the flexibility but also a direct mechanical fastening all the way through it, I had several failures of these on mine where the rubber sheared, was never sure if it was heat related or something else. I think I was using mini sized ones but note that Dave has had no problems in 7 years, maybe I just had bad ones.

  5. #5
    Join Date
    May 2012
    Location
    near Thame
    Age
    42
    Posts
    187
    Him I'm going to be starting setting up my side pipes hopefully bsoonm
    Can I ask what size mini bobbins have you used?

    Cheers
    Greg

  6. #6
    Join Date
    Jan 2014
    Location
    High Wycombe
    Age
    56
    Posts
    751
    Back in a minute screwed up the diagram.
    Attached Images Attached Images
    Last edited by Gatwick Axe Man; 02-12-20 at 10:35 AM.
    AK gen 1 delivered 05/05/17, on the road shortly!

  7. #7
    Join Date
    Jan 2014
    Location
    High Wycombe
    Age
    56
    Posts
    751
    OK, take two. Land Rover bobbins are just a bit too big so any reason why I can't do it something like this, with the bobbins in compression not tension as they are in the other diagram. One bobbin behind the other, gives a similar overall size but just looks a bit better from the side Untitled (1024x526).jpg

    Any comments welcome, Graham.
    Last edited by Gatwick Axe Man; 02-12-20 at 11:16 AM.
    AK gen 1 delivered 05/05/17, on the road shortly!

  8. #8
    Join Date
    Feb 2011
    Location
    Northampton
    Age
    42
    Posts
    4,431
    The last picture is basically how the Dax mounts are - well, they're how the mounts on the DB sidepipes I have are intended to work anyway.. the exhaust sits "on" a single bobbin (M10 thread IIRC). No harm in using two, I suppose - all the motion ought to be up and down along the length of the car (as the chassis twists) anyway
    My DeDion build diary..
    Hon Sec of the Digidash branch of the Unpopular Kit Car Design club

  9. #9
    Join Date
    Aug 2012
    Location
    Worthing,West Sussex
    Posts
    68
    I used this firm for bobbins,various sizes available https://moore4motors.com/product-cat...-parts/page/4/

  10. #10
    Join Date
    Oct 2013
    Location
    Ilford essex
    Age
    49
    Posts
    139
    Would these do the job?
    https://www.ebay.co.uk/itm/223667946929
    Dax MK4, RV8

    Better to try, and fail....than to fail to try.

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