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  1. #1
    Join Date
    Apr 2016
    Location
    Cambridge
    Posts
    188

    Sumo Rivet/Bolt on Bonnet Scoop

    Hey.

    My plan has always been to cut out the original MK3 bonnet scoop and add a larger rivet/bolt on one. Searching on here, there are a couple of threads on the matter but I cant seem to find a definitive answer if it has been done and how? Speaking with the other suppliers, I think only the larger DAX and AK Supercharger scoops are big enough to cover the hole that would be left, the Old Ford Auto ones look like they have a ridge running down the middle which I don't really want.

    Any advice/images would be greatly appreciated.

    Thanks.
    Thanks,

    Grumbleweed

    If you're not meant to eat animals, how come they're made of meat!?

  2. #2
    Join Date
    Mar 2009
    Location
    liverpool
    Age
    47
    Posts
    607
    I plan on doing similar, but for a narrower scoop. So I will have fibreglass the hole to suit the new scoop. When I bought my body l did ask for a bonnet without a scoop but was told they don't do them anymore.

  3. #3
    Join Date
    Apr 2016
    Location
    Cambridge
    Posts
    188
    Quote Originally Posted by philbrad73 View Post
    I plan on doing similar, but for a narrower scoop. So I will have fibreglass the hole to suit the new scoop. When I bought my body l did ask for a bonnet without a scoop but was told they don't do them anymore.
    you need to find out what bonnet this is then! https://www.ebay.co.uk/itm/AC-COBRA-...MAAOSwof5gPogS
    Thanks,

    Grumbleweed

    If you're not meant to eat animals, how come they're made of meat!?

  4. #4
    Join Date
    Feb 2011
    Location
    Northampton
    Age
    42
    Posts
    4,687
    Quote Originally Posted by Grumbleweed View Post
    you need to find out what bonnet this is then! https://www.ebay.co.uk/itm/AC-COBRA-...MAAOSwof5gPogS
    Given the size of the scoop that used to be there .. I'd guess at older Dax maybe?
    My DeDion build diary..
    Hon Sec of the Digidash branch of the Unpopular Kit Car Design club

  5. #5
    Join Date
    Feb 2007
    Location
    West Sussex
    Posts
    9,394
    Be useful to state what the width of the Sumo scoop is front and rear.
    IIRC older Sumo bonnets are single skin apart from the perimeter, whereas newer ones have a complete inner skin on the underside.
    If you have an older bonnet, then its not that hard to cut out the old scoop and bend a piece of ali to match the curvature and then fibreglass from underneath.
    Doesn't need to be perfect because you are going to remove most of it anyway when you fit the new scoop.
    A double skin makes the job a bit trickier.
    Crendon Chassis No.49
    Huddart FE428 + toploader

    Not listed in the Shelby Register.

  6. #6
    Join Date
    Apr 2016
    Location
    Cambridge
    Posts
    188
    Thanks Kevin.

    Mine will be the newer double skin. According to Pilgrim the scoop is 635mm long, 380mm at its widest point at the front and 39mm high at the front.

    DAX = 900mm long x 400mm wide x 80mm high

    AK Supercharger = 730mm long x 490mm wide x 50mm high



    Quote Originally Posted by KevinW View Post
    Be useful to state what the width of the Sumo scoop is front and rear.
    IIRC older Sumo bonnets are single skin apart from the perimeter, whereas newer ones have a complete inner skin on the underside.
    If you have an older bonnet, then its not that hard to cut out the old scoop and bend a piece of ali to match the curvature and then fibreglass from underneath.
    Doesn't need to be perfect because you are going to remove most of it anyway when you fit the new scoop.
    A double skin makes the job a bit trickier.
    Thanks,

    Grumbleweed

    If you're not meant to eat animals, how come they're made of meat!?

  7. #7
    Join Date
    Apr 2016
    Location
    Cambridge
    Posts
    188
    FYI this bonnet comes from a BRA 289

    Quote Originally Posted by Grumbleweed View Post
    you need to find out what bonnet this is then! https://www.ebay.co.uk/itm/AC-COBRA-...MAAOSwof5gPogS
    Thanks,

    Grumbleweed

    If you're not meant to eat animals, how come they're made of meat!?

  8. #8
    Join Date
    Apr 2016
    Location
    Cambridge
    Posts
    188
    Any thoughts on benefits of either bolting or riveting the scoop on? I would assume peel rivets for a gel coat?
    Thanks,

    Grumbleweed

    If you're not meant to eat animals, how come they're made of meat!?

  9. #9
    Join Date
    Feb 2011
    Location
    Northampton
    Age
    42
    Posts
    4,687
    I was planning on using small dome-headed allen bolts & nyloc nuts, personally; mostly because I very much dislike riveting into fibreglass. That said, peel rivets are something I just learned about
    My DeDion build diary..
    Hon Sec of the Digidash branch of the Unpopular Kit Car Design club

  10. #10
    Join Date
    Feb 2007
    Location
    West Sussex
    Posts
    9,394
    Don't rivet it on, it will make a mess of the grp. Original cars were an ali skin which would have been fine.
    Take some small stainless allan head bolts. Some people nut and bolt them. I drilled holes and tapped the grp so they dont show though on the other side.
    Alternatively you can use short self-tappers.
    Crendon Chassis No.49
    Huddart FE428 + toploader

    Not listed in the Shelby Register.

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