pewe
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| posted on 16/8/07 at 06:51 PM |
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Formula 27 (F27) WARNING
Formula 27 marque owner Peter Allen of Image Sportscars has just issued a warning about the wishbones with end nuts and also the need for all to check
forward wishbone U mounts after some incidents of them failing.
He reckons that it probably applies to cars 6 years or older but worth checking.
If in doubt he invites owners to contact him.
His new lower wishbones have adjusters which avoid the need to split the ball- joint to adjust camber - might be useful for Locosters?
Cheers, Pewe 
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westf27
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| posted on 16/8/07 at 07:25 PM |
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you little ray of sunshine 
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MikeRJ
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| posted on 16/8/07 at 09:38 PM |
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I thought the welded nut on wishbone problem came to light literaly years ago?
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Catpuss
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| posted on 16/8/07 at 09:39 PM |
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Tangoman has an F27. I'll U2U him in case he has managed to get an engine with 4 cylinders in it yet.
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gregf27
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| posted on 16/8/07 at 09:41 PM |
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I put a post on this very subject a while ago as it happened to me!!!
got some replacements from steve porter that have the threaded insert tig welded in place ( lower wishbones)
no problems since!
Greg
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gregf27
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| posted on 16/8/07 at 09:58 PM |
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see here!
 
F27 lower wishbone snapped
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Bluemoon
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| posted on 17/8/07 at 09:10 AM |
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Hello all,
Don't like the look of that design, asking for trouble, I would think a turned threaded insert made to fit into the tube would be a better
solution welded around as the nut, but for good measure a couple of plug welds further down would not go amiss.. not just welding the nut back on as a
butt joint.. I guess it would be o.k mind if the weld was 100% good. From the pics it looks like the weld penetration was very poor, and this was the
problem?
Link to old thread:
http://www.locostbuilders.co.uk/viewthread.php?tid=46257&page=1
Dan
[Edited on 17/8/07 by Bluemoon]
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kb58
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| posted on 17/8/07 at 01:11 PM |
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Oh good Lord... that's the worst think I've seen on a car in years. If they'd calculated the torque on that nut they'd find
it's effectively 1000s of foot-pounds. I'd like to put this picture in the next edition of my book if that's okay...
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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kikiturbo
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| posted on 17/8/07 at 04:27 PM |
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what I find alarming on this example is not only the wrong design but the absolute lack of weld penetration on the tube and nut...
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40inches
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| posted on 18/8/07 at 10:06 AM |
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This is the work of a major manufacturer? If this is a known issue, should have been a recall.
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gregf27
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| posted on 21/8/07 at 11:31 AM |
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just to clarify, my car had been built from an early set of plans , The manufacturer changed the design shortly afterwards to the threaded insert
design,
I justed wanted to highlight this safety issue on this forum to inform any F27 owner who has the old design to get them changed .
luckily for me , I was travelling slowly on a country lane when mine snapped, I shudder everytime I see the photos.Hopefully It may prevent an
accident / injury. I know of one other F27 this has happened to, so its not an isolated incident.
Greg
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