You cannot get play in a VCU, it either works or it seizesThe car would work just as well on road with the VCU removed, maybe better.
Only if you were towing it, there wouldn't be any drive to the propshafts with VCU removed.
Only if you were towing it, there wouldn't be any drive to the propshafts with VCU removed.
Datatek
Well-Known Member
Wrong, depends on how you remove it, I plan to fit an empty one.Only if you were towing it, there wouldn't be any drive to the propshafts with VCU removed.
Wrong, depends on how you remove it, I plan to fit an empty one.
Good luck with that, a bit like removing one drive shaft from each axle and same result.
Datatek
Well-Known Member
So you don't Understand how a differential works? The VCU is just a diff lock, nothing to do with transmitting power to the the front or rear axles which is done by the centre differential.Good luck with that, a bit like removing one drive shaft from each axle and same result.
Last edited:
Datatek
Well-Known Member
Here is the same picture I posted before:-
The outer case of the VCU connects to the large shaft splines and provides the drive to the front prop via the casing, the inner part of the VCU connects to the axial inner shaft from the rear prop drive, when the two shafts rotate at different speeds due to wheel slip, the VCU progressively locks. Removing the fluid from the VCU simply prevents it locking when the shaft speeds are different.
Remember, information is king
The outer case of the VCU connects to the large shaft splines and provides the drive to the front prop via the casing, the inner part of the VCU connects to the axial inner shaft from the rear prop drive, when the two shafts rotate at different speeds due to wheel slip, the VCU progressively locks. Removing the fluid from the VCU simply prevents it locking when the shaft speeds are different.
Remember, information is king
Attachments
Datatek
Well-Known Member
All my previous 4 x 4's had had open centre diffs with a centre diff lock, I don't remember ever having to use the centre diff lock, but then I don't do any serious off road stuff.As i said ok carry on. Hope you know a good towing company if you every get bogged down.
If you have no diff lock and you get stuck it would allow the axle without traction to get all the power there would effectively be no drive to the none slipping axle. If one wheel on the driven axle has no traction all the power will go through that wheel. The centre diff is just the same as a diff in an axle were if one wheel has no traction no power is sent to the wheel with traction. Without a centre diff lock the front wheels or rear wheels can be driven independent of each other. You can have the rear wheels spinning without driving the front ones. So it is possible to have one wheel spinning on the driven axle which means you are going nowhere. Understanding information is king.
Last edited:
Datatek
Well-Known Member
Tell me something I don't know. If understanding information is King, it's a shame you don't understand. With 4 wheel TC any spinning wheel is checked with or without the VCU.If you have no diff lock and you get stuck it would allow the axle without traction to get all the power there would effectively be no drive to the none slipping axle. If one wheel on the driven axle has no traction all the power will go through that wheel. The centre diff is just the same as a diff in an axle were if one wheel has no traction no power is sent to the wheel with traction. Without a centre diff lock the front wheels or rear wheels can be driven independent of each other. You can have the rear wheels spinning without driving the front ones. So it is possible to have one wheel spinning on the driven axle which means you are going nowhere. Understanding information is king.
Tell me something I don't know. If understanding information is King, it's a shame you don't understand. With 4 wheel TC any spinning wheel is checked with or without the VCU.
Yeah but without the VCU in the P38 centre diff there won't be any spinning wheels. Think you had better look at the diagram you posted and understand why that would be so.
Datatek
Well-Known Member
Gosh, you really don't understand how a diff works, or maybe you need specsavers.
With an empty VCU, the case still transmits power to the front prop, the rear drive is always connected.
tomcat59alan
Well-Known Member
Datatek
Well-Known Member
Alleviates boredomChillaxe, it's the norm.
Alleviates boredom
Ok i give in can't be arsed. Going on holiday Wed night Thursday morning will drop you a card as we fly over.
Ok i give in can't be arsed. Going on holiday Wed night Thursday morning will drop you a card as we fly over.
Well that was more pleasant than I was expecting. I thought he was going to visit the smallest room on the plane as he passed over Toulouse.
I found the explanation over the page on how the VCU works more help.
With little differences in speed the jelly stays liquid and the VCU doesn't do anything. When the front and rear shafts spinning speeds are a lot different it heats up and locks solid. So if you could get the jelly out it would never lock. Think that was Datatek's idea.
Of course, as Wammers pointed out, if you hit some mud and you're going to have fun!
Personally I still like the idea of a proper difflock.
With little differences in speed the jelly stays liquid and the VCU doesn't do anything. When the front and rear shafts spinning speeds are a lot different it heats up and locks solid. So if you could get the jelly out it would never lock. Think that was Datatek's idea.
Of course, as Wammers pointed out, if you hit some mud and you're going to have fun!
Personally I still like the idea of a proper difflock.
Remember the lad with the Bees, that was more than likely his problem. No jelly to transmit the welly.
Remember the lad with the Bees, that was more than likely his problem. No jelly to transmit the welly.
They're **** in proper mud. I've had to be pretty brutal once or twice to pull myself out. Never go anywhere without the winch now.
