40inches
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| posted on 24/9/09 at 08:27 PM |
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Another propshaft failure
Not mine,on a Seven that Dave Walker had on his rollers, went through the side panels and hit his leg at 120mph On page 98 in this months PPC.
That does it for me, definitely going to reinforce the tunnel.
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liam.mccaffrey
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| posted on 24/9/09 at 08:28 PM |
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saw that have n't read thearticle yet though
Build Blog
Build Photo Album
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tomgregory2000
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| posted on 24/9/09 at 08:34 PM |
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its quite mad that it split in three and twisted to feck
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scudderfish
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| posted on 24/9/09 at 08:39 PM |
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Looked like it was made out of toffee.
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40inches
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| posted on 24/9/09 at 08:47 PM |
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What the feck causes them to do that? never heard of one twisting on a 1.5 ton Sierra! Scary? I think so
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blakep82
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| posted on 24/9/09 at 09:00 PM |
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anyone know where i can see it?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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twybrow
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| posted on 24/9/09 at 09:09 PM |
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I've just finished wrapping my prop up to send back to D&F to have the front section replaced after my fun at Coombe. Sounds like I got off
very lucky compared to Mr Walker...!
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YQUSTA
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| posted on 24/9/09 at 09:25 PM |
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I think I will do some thing with mine when I change the engine over the winter
this talk of props going is getting to often on the forum.
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Dangle_kt
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| posted on 24/9/09 at 09:37 PM |
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I don't read that mag, is his leg ok?
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A1
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| posted on 24/9/09 at 09:40 PM |
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blimey...hope his legs ok...
i always give my prop a wee check these days after hearing the stories.
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coozer
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| posted on 24/9/09 at 10:35 PM |
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Another lesson in NOT making your own prop, best left to the professionals. Not that I'm saying it was homemade mind you...
Dave reckoned if there'd been a passenger they would have got it!
1972 V8 Jago
1980 Z750
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A1
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| posted on 25/9/09 at 01:19 AM |
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bit dodgy what hes saying about the compensation... yet another reason to take out the passenger seat 
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livelee
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| posted on 25/9/09 at 07:00 AM |
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The propshaft on my Mac was a disaster waiting to happen.
As I understand it the "knuckles" on the UJ at each end of the shaft should line up with the other. Well mine were fixed so that they
were offset from each other for some reason.
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speedyxjs
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| posted on 25/9/09 at 07:26 AM |
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I have welded two upright bars on either side at the front and back on my transmision tunnel to hopefully take most of the force should my prop break.
I am also getting mine done professionally (when i have some money).
How long can i resist the temptation to drop a V8 in?
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40inches
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| posted on 25/9/09 at 07:37 AM |
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Would a panel of Kevlar/Carbon instead of ally offer protection I wonder?
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iiyama
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| posted on 25/9/09 at 07:47 AM |
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^^^ No!
Kevlar will probably do the trick in stopping any shrapnel but it wouldnt stop a prop. Carbon definatly wouldnt stop anything, in fact it would
shatter sending even more shrapnel your way........
That failiure looks well dodgy......
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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motorcycle_mayhem
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| posted on 25/9/09 at 07:58 AM |
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Propshaft failure scares me enough to take the tunnel top off and check after every weekend.
I had the rear section go (just on the output of the reverse gearbox), when (yet) another spindle snapped on the gearbox end of last year (whether the
spindle went first and then the UJ or vice-versa don't know). Fortunately on the downchange, entering Quarry, so slower than a lot of
opportunities, but the mess took a chunk out of my thigh nonetheless.
Only thing that really worries me now (having dumped the gearbox) is that the electric reverse assembly is now the obvious danger area. But
don't get me started on the MSA's insistence that I have such an assembly....
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pif
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| posted on 25/9/09 at 08:19 AM |
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those pictures look bad, makes me glad now that mine stayed in the engine bay when it let go.
been a bit of a rush job really, bodged it all together in just 5 1/2 years.
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MikeRJ
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| posted on 25/9/09 at 09:03 AM |
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I read this in PPC last night, and he mentions that there was a lot of vibration from an "unbalanced wheel" during mapping, and that the
welds on the prop held up ok.
I suspect the vibration was far more likely the prop was already bent/unbalanced, and you can see the prop has failed right next to a weld in the
pictures.
Prop failures are almost unheard of in road cars, the only reason they can be failing in kit cars is faulty manufacture (unlikely if professionally
done) or incorrect installation e.g. not enough of the sliding joint in the gearbox, incorrect flanges, loose bolts etc.
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livelee
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| posted on 25/9/09 at 10:24 AM |
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Probably the same issue as mine would have had. With the UJs not lined up properly it causes the shaft to be unbalanced. Definately an
"engineering" error on behalf of the builders.
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twybrow
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| posted on 25/9/09 at 11:01 AM |
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quote:
Originally posted by iiyama
^^^ No!
Kevlar will probably do the trick in stopping any shrapnel but it wouldnt stop a prop. Carbon definatly wouldnt stop anything, in fact it would
shatter sending even more shrapnel your way........
That failiure looks well dodgy......
Where do people get this opinion from, that carbon fibre laminates are as brittle as a sheet of glass!? I make/develop primary aerospace CF parts,
including test firing 8lb birds, travelling at several hundred miles an hour into the parts - you would be amazed at what a well designed composite
part can withstand.
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MikeRJ
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| posted on 25/9/09 at 11:17 AM |
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quote:
Originally posted by livelee
Probably the same issue as mine would have had. With the UJs not lined up properly it causes the shaft to be unbalanced. Definately an
"engineering" error on behalf of the builders.
I agree that is a very fundamental aspect of universal joints. A decent, professional propshaft manufacturer simply wouldn't make that kind of
mistake.
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cd.thomson
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| posted on 25/9/09 at 11:30 AM |
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quote:
Originally posted by twybrow
quote:
Originally posted by iiyama
^^^ No!
Kevlar will probably do the trick in stopping any shrapnel but it wouldnt stop a prop. Carbon definatly wouldnt stop anything, in fact it would
shatter sending even more shrapnel your way........
That failiure looks well dodgy......
Where do people get this opinion from, that carbon fibre laminates are as brittle as a sheet of glass!? I make/develop primary aerospace CF parts,
including test firing 8lb birds, travelling at several hundred miles an hour into the parts - you would be amazed at what a well designed composite
part can withstand.
I'm not doubting your knowledge and experience but playing devils advocate iiyama did make most of his car in CF himself - he's not just
trolling 
Craig
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Gergely
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| posted on 25/9/09 at 11:30 AM |
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Is there any info on the car that was tested in the article? How much power / torque does the engine have? BEC or CEC? Home made propshaft or bought
from the kit manufacturer or a specialist?
Our prop worries me, too. We have a two piece propshaft, having a Quaife reverse. The front prop is short, but is angled quite sharply. The second
prop is the longer one to the diff. We did have loose bolts in the past, but noticed the vibrations and tightened with stronger Loctite. It seems fine
now, but I check every week...
Gergely
Our build pictures
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livelee
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| posted on 25/9/09 at 12:16 PM |
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quote:
Originally posted by MikeRJ
quote:
Originally posted by livelee
Probably the same issue as mine would have had. With the UJs not lined up properly it causes the shaft to be unbalanced. Definately an
"engineering" error on behalf of the builders.
I agree that is a very fundamental aspect of universal joints. A decent, professional propshaft manufacturer simply wouldn't make that kind of
mistake.
Yes, you'd hope so.
My car was a factory car from Mac. Maybe they were buying them in and didn't check the shaft before assembley, or maybe they had a YTS lad in
building them when my car was built. Who knows. If they are all like mine was then i'd be very concerned. If I was an owner of a Mac now
i'd definately be under it to check the shaft has been built correctly.
For my new build I've got a shaft from Dunning and Fairbank. HD tube, circlipped uj's and grease nipples on the uj's for proper
maintenance. All new parts, no cut and shut from a donor.
[Edited on 25/9/09 by livelee]
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