markie t
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 posted on 10/10/10 at 09:36 PM |
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help needed, propshaft come off
was out tonight and on the way home my propshaft decided to detatch itself from the gearbox (99 r1) and ended up coming home on a recovery truck. As a
result of flailing around it has damaged the threads slightly on the shaft that the adaptor sprocket goes onto, can somebody please let me know if
this is a main shaft for the gearbox and would the threads be ok to be tapped and die'd and re bolted back together, thanks, mark.
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eznfrank
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| posted on 10/10/10 at 09:39 PM |
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Did you have a prop catcher?? Sounds like you got off VERY lightly if that's all it did!!
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markie t
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| posted on 10/10/10 at 09:48 PM |
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yes i think so, there is a large rubber mount that holds the propshaft central just inside the front of the tunnel, it is only front end of the prop
that has been spinning/flailing in the engine bay, i sh*t myself when it happened, sounded horrible!!!
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snapper
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| posted on 11/10/10 at 05:20 AM |
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When you find a solution and effect a repair, use thread lock on every nut and bolt, also consider wire locking critical componants.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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mangogrooveworkshop
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| posted on 11/10/10 at 07:50 AM |
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Might help putting your location in to see if theres other builders in your area who could help you out
<<<<<<<<<<<< poulton nr blackpool.
A prop catcher may be needed and a very good check of all the components in the drive train.
a person that would help you is AB engineering Andy Bates. he is a specialist in the bec field.
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Breaker
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| posted on 11/10/10 at 09:29 AM |
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On many pictures of BEC-chassis I've seen(Including Indy R that I have) the output flange of the gearbox is not parallel to the diff flange.
This will cause vibration and stress to the gearbox/diff/flanges.
I will certainly reposition the bike engine in my chassis so it is perfectly in line with the diff.
More reading here :
UJ - linky
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boggle
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| posted on 11/10/10 at 11:29 AM |
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i cannot get my blade engine parralell to my diff....it just wont fit
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ReMan
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| posted on 11/10/10 at 01:04 PM |
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quote:
Originally posted by Breaker
On many pictures of BEC-chassis I've seen(Including Indy R that I have) the output flange of the gearbox is not parallel to the diff flange.
This will cause vibration and stress to the gearbox/diff/flanges.
I will certainly reposition the bike engine in my chassis so it is perfectly in line with the diff.
More reading here :
UJ - linky
It does not need to be perpectly in line, that's why you have a UJ's
But the faces should be roughly parrallel
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ReMan
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| posted on 11/10/10 at 01:09 PM |
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quote:
Originally posted by mangogrooveworkshop
Might help putting your location in to see if theres other builders in your area who could help you out
<<<<<<<<<<<< poulton nr blackpool.
A prop catcher may be needed and a very good check of all the components in the drive train.
a person that would help you is AB engineering Andy Bates. he is a specialist in the bec field.
Not tempting fate, but surely a prop catcher is after the event?
Prevention beteer than cure an all that 
However I agree that it would be very easy at to build in a load more ribs of box/tube section in the tunnel top and sides, which would easily contain
it should the worst happen
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Breaker
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| posted on 11/10/10 at 01:09 PM |
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quote:
Originally posted by ReMan
It does not need to be perpectly in line, that's why you have a UJ's
But the faces should be roughly parrallel
Indeed, that was what I meant.
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Liam
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| posted on 11/10/10 at 08:13 PM |
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You dont have to have the input and output planes parallel to be able to cancel out the non-uniform velocity. You just need two joints with the same
angle on them - e.g. in the BEC application have the same angle on the sprocket adaptor joint and the centre joint.
Or just stick a rubber cush drive in there!
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Breaker
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| posted on 12/10/10 at 08:12 AM |
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quote:
Originally posted by Liam
You dont have to have the input and output planes parallel to be able to cancel out the non-uniform velocity. You just need two joints with the same
angle on them - e.g. in the BEC application have the same angle on the sprocket adaptor joint and the centre joint.
I don't quite understand what you're saying. Can you post a small drawing ?
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sickbag
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| posted on 12/10/10 at 08:20 AM |
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Given the short-comings of UJ's would it not be better to have the propshaft made up with CV joints instead? Can they be requested when having
one made up?
I only ask as I'll be needing one soon and don't like the idea of a UJ failing.
Finally back on the job!
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Liam
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| posted on 12/10/10 at 12:46 PM |
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quote:
Originally posted by Breaker
quote:
Originally posted by Liam
You dont have to have the input and output planes parallel to be able to cancel out the non-uniform velocity. You just need two joints with the same
angle on them - e.g. in the BEC application have the same angle on the sprocket adaptor joint and the centre joint.
I don't quite understand what you're saying. Can you post a small drawing ?
Eg like this...
 
Description
First joint cancels the second joint. Same principle as those double joints used in offroading when the propshafts are hanging down for big ground
clearance.
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