VinceGledhill
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| posted on 11/8/05 at 08:10 AM |
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Alignment of Prop Shaft
I'm just about to fit a new bike engine into my car.
Can I mount the engine so that the prop shaft is in a slightly (3 inches or so) different horizontal plane to the dif?
Both flanges will be parallel. With the Horezontal alignment being out slightly, will this affect the vertical movement? Or will the UJ's just
simply take out any twisting errors?
It's just concerning me and I can't get my head around it. Suppose I should just get a prop and try it 
Regards
Vince Gledhill
Time Served Auto Electrician
Lucas Leeds 1979-1983
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David Jenkins
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| posted on 11/8/05 at 08:32 AM |
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If I'm reading you correctly, the layout you describe is ideal - the flanges at each end shouldn't be exactly in line with each other as
that knackers the UJ bearings (brinneling).
Each UJ should work at a slight angle to ensure that the bearings work properly, although the faces of the flanges must be parallel.
If you do a Google on 'propshaft brinneling' you might find some better descriptions - you may have to reduce the number of
'n's and double the number of 'l's in the second word to get the right answer!
David
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VinceGledhill
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| posted on 11/8/05 at 11:59 AM |
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Hi David thanks for your reply.
What I mean is that the prop shaft will be not only vertically away from the engine but horizontally too.
like this... please excuse the bad drawing...
[Edited on 11/8/05 by VinceGledhill]
Regards
Vince Gledhill
Time Served Auto Electrician
Lucas Leeds 1979-1983
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David Jenkins
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| posted on 11/8/05 at 12:10 PM |
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I'd guess that it makes no difference! As long as the flange faces are parallel, and the centres of rotation aren't TOO far away from
each other, then all should be fine.
...but get a few other opinions! 
David
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NS Dev
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| posted on 11/8/05 at 12:18 PM |
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That's how the prop runs on every rwd live axle car (remember the pinion isn't in the middle) so I guess it will be fine
[Edited on 11/8/05 by NS Dev]
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VinceGledhill
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| posted on 11/8/05 at 12:20 PM |
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Thanks guys. I wanted to have some flexibility in the engine mounting of the bike engine lump. I'm just in the process of making all the
brackets and stuff.
Regards
Vince Gledhill
Time Served Auto Electrician
Lucas Leeds 1979-1983
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Danozeman
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| posted on 11/8/05 at 05:31 PM |
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Looks ideal set up. U dont want too much angle there though.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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GaryM
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| posted on 11/8/05 at 07:03 PM |
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Why do the flange faces need to be parallel?
I'm not disagreeing, just interested to know?
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JoelP
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| posted on 11/8/05 at 09:17 PM |
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something about u/j's not being constant velocity joints, if they are not square to eachother then movement is turned into pulses of movement
if you have a universal joint at hand, give it a go with some angle! If you hold them at 90 degrees, then each side must be rotated 180 degrees before
the other can move
this is also why the knuckles must be lined up, so the effect cancels out
[Edited on 11/8/05 by JoelP]
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VinceGledhill
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| posted on 11/8/05 at 10:35 PM |
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Yeah. UJ's are not CV's.
They have to be aligned in Parallel.
When one moves more than the other then the others movement to a lesser degree cancels it out.
Sound like bollox? could be I'm pissed whilst typing.
I know what I mean.
Regards
Vince Gledhill
Time Served Auto Electrician
Lucas Leeds 1979-1983
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turbodisplay
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| posted on 12/8/05 at 04:13 PM |
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re the cv / uj debate, look at a propshaft, the arms are in the same place each end to cancel this varible (pulse) movement.
Just had to correct that mistake an hour ago.
Glad i noticed it!
I`ll put some pics of my front and rear prop when i finish.
Darren
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