Winston Todge
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| posted on 11/6/11 at 09:37 AM |
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MNR VortX R1 prop wobble... With video!
I have noticed a slight resonance through the chassis when travelling at around 20 to 30 mph and was curious what the propshaft was doing at this
point. I popped the tunnel cover off and video what happened...
http://www.youtube.com/watch?v=XLuUsPJzl3s
There is a misalignment through the centre bearing as shown here...
 
Prop alignment 1
 
Prop alignment 2
Could this be a route cause or is it an imbalance in the prop, too squidgy centre bearnig rubber, etc...?
Any ideas would be greatly appreciated as it does cause a slight knocking when travelling at these speeds. Above and below 20 to 30 mph it's
absolutely fine.
Cheers,
Chris.
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mangogrooveworkshop
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| posted on 11/6/11 at 10:43 AM |
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I had a similar problem at 80 mph when i come off the gas and the propshaft man said it was squidgy prop bearing rubber ....
unforgeable the car got sold before i fixed it
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minitici
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| posted on 11/6/11 at 11:51 AM |
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Can't help thinking that you would be best to remount the centre bearing in a 'neutral' position to avoid putting it under constant
strain.
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Winston Todge
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| posted on 15/6/11 at 08:53 PM |
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Anyone else got any input? Maybe?
Ta in advance.
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mangogrooveworkshop
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| posted on 17/6/11 at 08:56 PM |
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Bailey Morris say it's supposed to have pressure on the rubber bearing mointo
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Winston Todge
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| posted on 17/7/11 at 04:58 PM |
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What did BM say Mango?
It needs pressure on the centre bearing? i.e. not central?
Thanks,
Chris.
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Winston Todge
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| posted on 13/5/12 at 08:19 AM |
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Sorry for the late bump!
Any other input from anyone?
Currently pulling the car apart to upgrade/fix some choice bits...
Thanks,
Chris.
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big_l
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| posted on 13/5/12 at 08:52 AM |
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If you have a telescopic joint at one end take a pic of that plz I suspect the prop might be slightly to long wich is forcing the prop to bend ???
If there was free play at one end then surely you would by unable to make the prop force it's self to one side of the bearing as it would just
try and centre itself ??? Pics plz
Check out my blog  mnrvortxhayabusa@blogspot.com
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Winston Todge
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| posted on 13/5/12 at 10:51 AM |
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There is a telescopic joint at the sprocket end of the prop which is nominally centered across its length of travel, allowing the maximum extension
and compression in either direction.
I'm pretty sure the prop can't be bent as this is a wobble that only seems to resonate at certain frequencies (i.e. at certain road
speeds). If it was a bend, the relationship between road speed and 'wobble' would get linearly worse with speed (excluding any
constructive 'wobble', i.e. resonance).
Having pulled it all apart now, it seems like the centre bearing will always droop slightly due to the mass of the prop itself and the fact that
it's rigidly mounted at either end (i.e. sprocket adapter and diff input).
Does anyone else see this droop? Or is my centre bearing too soft?!
I'll grab a piccie in a min.
Do you have a picture of your centre bearing by any chance big_l?
Thanks again,
Chris.
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Winston Todge
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| posted on 13/5/12 at 10:52 AM |
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P.S. Great build by the way big_l!
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big_l
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| posted on 13/5/12 at 07:13 PM |
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Cheers dude . Must just be a soggy bearing then mines not exactly hard rubber !!
Check out my blog mnrvortxhayabusa@blogspot.com
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