Jumpy Guy
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| posted on 24/2/10 at 05:27 PM |
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Attching bonnet bulge
Tried the search, and amazingly nothing came up....
I got an MK bonnet bulge - how do I fix it to the bonnet?
I expected it to have some kind of flange, but its just a 'normal' edge
If anyone can advise, or link to a relevant previosu thread?
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Humbug
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| posted on 24/2/10 at 05:38 PM |
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I spoke to MK about the "old style" bulges and asked if there was a lip to fix to the bonnet. The guy said no, but they they normally
glass or Sikaflex a few L-shaped ali brackets around the inside edge and fix through the bonnet into those.
[Edited on 24.02.2010 by Humbug]
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Daddylonglegs
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| posted on 24/2/10 at 06:11 PM |
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Are the bonnet and bulge F/Glass? IF so, I would bond some matting and resin under the bulge to attach to bonnet then use filler around the top join
(assuming you will be spraying it of course).
Just my 10p worth 
It looks like the Midget is winning at the moment......
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BenB
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| posted on 24/2/10 at 06:18 PM |
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Yup, depends if there's a return. On the STM one there was a nice return so I just drilled some holes through the bonnet into the return and
pop-rivetted it in place (with some washers to prevent crushing).
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Jumpy Guy
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| posted on 25/2/10 at 12:25 PM |
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No, no return on it.
I'm fitting it to an alli bonnet, so cant resin or filler it
Hmm.
Anyone fitted one of these to an alli bonnet?
how to get a strong/neat fixing? never done any fibre glass, so any hints/tips/ photos much appreciated...
Do I make an alli bracket and then bond it to the bulge? how many brackets will i need? do i silicon around the complete edge to make a seal?
[Edited on 25/2/10 by Jumpy Guy]
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boggle
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| posted on 25/2/10 at 01:37 PM |
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i need a small bulge in the ali bonnet im making so im going to have to pannell beat it in.....
just because you are a character, doesnt mean you have character....
for all your bespoke parts, ali welding, waterjet, laser, folding, turning, milling, composite work, spraying, anodising and cad drawing....
u2u me for details
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907
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| posted on 25/2/10 at 01:38 PM |
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You could:-
Position the bulge and mark round it.
Cut the hole about 15mm smaller all round.
Dress the edge of the hole upward allowing for the thickness.
Fix to this flange with M4 s/s pan head screws.
Cheers
Paul G
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Jumpy Guy
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| posted on 25/2/10 at 02:04 PM |
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907- thats got me thinking.
Cut the hole, but leave half a dozen tabs sticking out.
Bend tabs up, to become the mounting points
put bulge on top, then glass over the tabs to stick them to the inside of the bulge
anyone see any problems with that?
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907
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| posted on 25/2/10 at 03:33 PM |
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Yes I can.
By the time you've cut a complicated shape hole with the tabs included and done all that
pi&&ing about with fibre glass you could have done it properly.
You just can't get the staff nowadays. 
Paul G
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Jumpy Guy
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| posted on 25/2/10 at 03:39 PM |
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;-)
I appreciate that its a simple method to a metal bending guru like you, but my metal bending expertise is limited
My metal work tools so far were a lamppost and a hammer
not sure i can bend a consistent flange around a hole.......
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907
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| posted on 25/2/10 at 03:51 PM |
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Your half way there, just ditch the lamp post.
You need a heavy flat bit of metal to hold on the top while you tap the edge up.
Anything will do. An old flat iron, (remember them?) a casting, lump of inch plate.
You must have summit laying in the shed.
Paul G
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