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Dave's Diary - The Story of the Spoiler #27404
12/03/09 09:20 PM
12/03/09 09:20 PM
Joined: Dec 2008
Posts: 17,937
South Yorkshire
DaveW Offline OP
Roadster Guru
DaveW  Offline OP
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Posts: 17,937
South Yorkshire
British Leyland Special Tuning at Abingdon designed a front spoiler for the MGB in the mid/late 60's. It may have been a fag packet design but it does reduce lift and weights the steering over 70mph. This spoiler, known as the "ST" spoiler is still available from MG specialists in white fibreglass. nerd
I bought one of the last of the original spoilers from Kennings in Sheffield in around 1981, and fitted it to my 1980GT. (I sold that car in 2003)
Many years later........................................

When I bought my Roadster I idly considered if this spoiler could be made to fit the Mog. thinking
I knew it was the right shape, but a shade on the narrow side - which doesn't matter. I pondered this for quite a while, and wondered how I could put this idea to the test. In the end I shelled out the 40 which these things cost and awaited delivery.............. coffee



I wondered (for some time) how I could experiment with this without destroying the spoiler. Out of the blue, I hit upon a solution............. Pape Mache. laugh2
So over the next ten days I relaxed in the garage with PVA glue and a pile of newspapers.



I added a layer of stiffer paper so I could see where I'd been....



I wondered how thick to make it so that it would retain it's true shape. I needn't have worried.



It popped off a treat and was an exact copy.
More to follow tomorrow.....goodnight



DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) Plus 4
Re: Dave's Diary - The Story of the Spoiler [Re: DaveW] #27415
13/03/09 07:59 AM
13/03/09 07:59 AM
Joined: Jul 2007
Posts: 14,247
Suffolk
John V6 Offline
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John V6  Offline
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Posts: 14,247
Suffolk
You do have Blue Peter badge I suppose!!


JohnV6
2006 Indigo Blue Roadster S1
Being paid to breathe
Re: Dave's Diary - The Story of the Spoiler [Re: John V6] #27416
13/03/09 08:04 AM
13/03/09 08:04 AM
Joined: Aug 2006
Posts: 7,602
England
Simon Offline

Talk Morgan Guru
Simon  Offline

Talk Morgan Guru

Joined: Aug 2006
Posts: 7,602
England
Originally Posted By John +4
You do have Blue Peter badge I suppose!!


We've very close to having the perfect team for 2010's Scrapheap Challenge; how does Morgan Maniacs sound? woohoo


Re: Dave's Diary - The Story of the Spoiler [Re: Simon] #27442
13/03/09 06:33 PM
13/03/09 06:33 PM
Joined: Dec 2008
Posts: 17,937
South Yorkshire
DaveW Offline OP
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DaveW  Offline OP
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Right then, back to the story:

There is a crucial step to this process which must be done properly. That's finding the centreline of the spoiler. It sounds simple, but the curve of the moulding and the curved edges combine to make this tricky. There's an old saying about "measure twice & cut once". For this I measured and measured and measured and measured. Once I was happy with the centreline, I measured the distance between the outer edges of the overrider irons. The outer edge is flat in the vertical plane.The next step was to take a pair of scissors..... and start the carve-up of my 'lovely' pape mache spoiler. The irons are L shaped in cross section, so to allow the spoiler to slot on from below, I measured the width of the horizontal component, and made another two cuts. At the bottom of these slots, there has to be a short vertical slot - more easy to understand in the photos. The length of these cuts was trial & error. Short at first then slowly extending. At the same time I chopped each end off at a jaunty angle. This was a sort of guess. I knew that wheel clearance would be an issue on lock. More of that later. Finally in order that the spoiler would fit up around the 'hornbox', I removed a good inch or two along the top edge and removed the top of the oval intake hole. My objective was that the spoiler would sit just below the overriders. This trial fitting took a long time. It was an essential part of the process. Although had it not worked I could have started again with a new pape mache spoiler!!
This was the result. I had started to mask up the fibreglass spoiler.


This next photo shows the processed 'real thing'. I used a hacksaw where possible. Where access was impossible I used a hacksaw blade with a masking tape handle. The horizontal cuts were drilled in the style of a dotted line, snapped off and filed smooth.The rough edges were filed or sanded smooth. You can just see the centreline mark.


And next we have two coats of Halfords very best red plastic primer. This took a full can, doing both sides. At this stage I'd drilled the four mounting holes and araldited penny washers at the back. These were held in place with nuts & bolts which came in handy to hold it while the paint dried.


And when the primer had dried for a couple of days, the red went on. The first coats were Audi Flash Red, because I didn't want to run out of Halfords special mix Rosso Corsa at a crucial moment.


And here it is after three good coats of Rosso Corsa spread over a few days. The Halfords 'mix while you wait' cans come with a good spray head which gives a thin vertical paint pattern (it can be turned 90degrees). It's much better than the usual round spray pattern which gobs all the paint 'in the middle'.


DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) Plus 4
Re: Dave's Diary - The Story of the Spoiler [Re: DaveW] #27443
13/03/09 06:55 PM
13/03/09 06:55 PM
Joined: Dec 2008
Posts: 17,937
South Yorkshire
DaveW Offline OP
Roadster Guru
DaveW  Offline OP
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South Yorkshire
The bottom of each overrider touches the spoiler, so to prevent chafing, I glued a small length of Neoprene edging on each as a buffer.


This shows the fasteners at a stage when I thought I'd sorted them. The 'yacht sail' shaped anodised aluminium pieces at the top were intended to fit on the outside of the overrider irons. A small portion is visible, and it would have smartened things up. But I tried one and it just wasn't good enough, so they were binned. The next block of fasteners are the outer fasteners and the penny washers fit either side of the irons. You'll see that I've added two wedges for extra location. At the bottom, those two angled brackets were my second attempt, but the alignment was just not right. So I ended up making some Mk3 brackets for the horn box.


This is the nearside bracket in place on the horn box, fresh Dinitrol applied. It uses the existing bolt - remember my 'no drilling' credentials. Those two nuts & bolts are UNF. The MK3 brackets took several trial fit attempts to get proper alignment. All brackets are made from Maplins two foot stainless steel ruler.


This is the complete fitting. You can see one rubber washer under the penny washer and there's another rubber washer between the washer previously araldited to the spoiler and the bracket. Hopefully this will provide a bit of 'give'.


This is the offside from under the wheelarch. You can see the top of the inner mounting, (underneath of nearside in previous photo). You can also see the penny washers on the overrider irons and the detail of the outer mounting, freshly Dinitroled.You can also see the edging. More about that in the next installment.


DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) Plus 4
Re: Dave's Diary - The Story of the Spoiler [Re: DaveW] #27445
13/03/09 07:50 PM
13/03/09 07:50 PM
Joined: Dec 2008
Posts: 17,937
South Yorkshire
DaveW Offline OP
Roadster Guru
DaveW  Offline OP
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South Yorkshire
Nearly there! laugh2
I had to take an afternoon off work to do the final fit - because it had been such a struggle. I pondered whether to fit 'end plates' to finish it off, but tried a cardboard template. It looks better 'bare' because it matches the wing edge. But it needed edging, so I referred to Baines' catalogue and selected a profile which matches the number plate box edging. The very last check was that there was clearance on full lock. So I jacked it up, and closed my eyes. There is something like 3/8inch clearance on lock. Perfick........ This picture shows the nearside on full lock. happy3


And here, by special request (1560), here are some higher level pictures.






I hope you've enjoyed the story. It's been a real voyage of discovery, and at times, immensely frustrating.
And now....... coffee
I must consider what to do next. wine


DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) Plus 4
Re: Dave's Diary - The Story of the Spoiler [Re: DaveW] #27452
13/03/09 11:54 PM
13/03/09 11:54 PM
Joined: Aug 2008
Posts: 234
Devon, Exeter
C
chris444 Offline
L - Learner Plates On
chris444  Offline
L - Learner Plates On
C

Joined: Aug 2008
Posts: 234
Devon, Exeter
Dave

Very impressive (your effort) but does it work?

Re: Dave's Diary - The Story of the Spoiler [Re: chris444] #27457
14/03/09 07:49 AM
14/03/09 07:49 AM
Joined: Oct 2007
Posts: 455
T
Trevor Offline
Learner Plates Off!
Trevor  Offline
Learner Plates Off!
T

Joined: Oct 2007
Posts: 455
Dave that is quite a project; hat is off to you. cheers

I would also like to know if you find any changes to the feel of the car at speed?

Re: Dave's Diary - The Story of the Spoiler [Re: Trevor] #27459
14/03/09 08:41 AM
14/03/09 08:41 AM
Joined: Dec 2008
Posts: 17,937
South Yorkshire
DaveW Offline OP
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DaveW  Offline OP
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Joined: Dec 2008
Posts: 17,937
South Yorkshire
Chris - I don't particularly like the high front of the traditional Mog, frown2 so - in the sense that I prefer the look of the front now, and it protects the suspension from road dirt, yes it works. laugh2 They were my two reasons for doing this.
In terms of cooling, it will certainly deflect air at the lower radiator tank, but it's difficult (impossible?)to quantify the outcome. In terms of feel Tevor, all I can say is this - with the full spoiler on an MGBGT, the transformation is significant, because the standard BGT runs nose up at speed due to the shape, and the full spoiler brings the nose down and weights the steering back to 'normal'. On the Mog it's not as low, nor as wide. Instead of air 'just' flowing underneath and being compressed under the floorboards, it will now either be chanelled through the intake - radiator lower tank & sump, or be forced round the edges where it will cool the brakes, or over the top edges into the wheel arches. It will be interesting to see how it feels, but I doubt I can get out in it before next weekend. My remaining concern is that it will stand up to the flexing.


DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) Plus 4
Re: Dave's Diary - The Story of the Spoiler [Re: Trevor] #27460
14/03/09 08:43 AM
14/03/09 08:43 AM
Joined: Jun 2008
Posts: 123
London
Y
Yuri Offline
L - Learner Plates On
Yuri  Offline
L - Learner Plates On
Y

Joined: Jun 2008
Posts: 123
London
Dave, this is serious project,the idea ,design,the process,attention to details,deserve highest marks.I ask myself a question, can I do this? The answer is yes ,but I need help of two friends and 40 bottles of whisky,and it would take about 5 weeks +firs attempt will be failure.

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