imp paul
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| posted on 16/1/07 at 08:28 PM |
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flipping the diff ?
hi just wanted to know has anyone ever flipt a diff in a sierra 3.62 lsd case. or is it possible ? so it would turn the other way cheers paul
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Liam
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| posted on 16/1/07 at 08:40 PM |
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No room to flip the diff in the case, but you could just turn the whole thing up-side-down and block the breather (perhaps adding another one). If
you're gonna run it in the reverse direction too, it might not like it (may just be noisy) but then again it might be fine!
Liam
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stevec
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| posted on 16/1/07 at 08:45 PM |
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Not designed to run in opposite direction.
Steve.
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Smartripper
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| posted on 16/1/07 at 09:06 PM |
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Hello,
The dutch importer overhere is building the MK indy with a shaft driven bike engine but that runs the wrong direction.
He is flipping the sierra diff, bloks the breather, and making a breather tru the filler plug.......
He's not having any problems so far and he build a few already, one is good now for 5000 miles.....
Daniel
[Edited on 16/1/07 by Smartripper]
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jacko
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| posted on 16/1/07 at 09:07 PM |
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I believe z cars flip them over on the front diff but they dont last long 
O i may be wrong then reading what is above
[Edited on 16/1/07 by jacko]
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imp paul
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| posted on 16/1/07 at 09:21 PM |
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thanks
thanks for all your help chaps nice 1 paul
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Liam
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| posted on 16/1/07 at 09:39 PM |
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quote:
Originally posted by jacko
I believe z cars flip them over on the front diff but they dont last long
O i may be wrong then reading what is above
[Edited on 16/1/07 by jacko]
Running up-side-down doesn't necessarily imply running in reverse direction! In the zcars 4x4 thing the front diff needs to be flipped
up-side-down because it is facing forwards rather than backwards. The engine still runs it in the correct direction.
Obviously the sierra diff isn't designed to run in reverse, but that doesn't mean it can't. The pinion shaft runs in two opposed,
preloaded tapered roller bearings so reversing the direction of axial thrust isn't gonna do anything to that. The pinion/crownwheel will mesh
on the backsides of their teeth. Might be weaker, might not. Might be noisy? Probably wont matter - at the end of the day the sierra diff is quite
bulletproof for this kind of app (bike engine I assume), is at least designed to survive putting the sierra in reverse, and cheap enough to test to
destruction anyway . I'd suck it and see...
Liam
[Edited on 16/1/07 by Liam]
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coozer
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| posted on 16/1/07 at 10:03 PM |
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The mesh on the gears is design to go in one, loaded direction only.
Its OK in reverse for a small while but I think it would be very rough and noisy upside down. Especially if its come from an ancient Sierra donor
1972 V8 Jago
1980 Z750
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stevebubs
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| posted on 17/1/07 at 01:02 AM |
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Think MK installed this setup in the Indy...
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CGILL
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| posted on 17/1/07 at 03:12 AM |
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It'll work, you have a crush tube between the two pinion bearings, and running it in reverse loads this crush tube from the thrust created by
the hypoid cut. You'll get away with it on a bike engine because it doesn't have huge torque which would destroy this after a few heavy
clutch drops. You may get issues from the pinion bearings being starved of oil form being above the oil level. But lets face it, we're not going
to be doing 30,000km per year in these cars
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robinj66
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| posted on 17/1/07 at 08:38 AM |
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Does it make any difference that it's an LSD?
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trikerneil
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| posted on 17/1/07 at 12:40 PM |
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My Sierra diff didn't like working upside down.
ACE Cafe - Just say No.
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imp paul
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| posted on 17/1/07 at 06:06 PM |
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diff
so i take it the diff will run upside down ok chaps? well i hope .its got to it lives in the rear of my imp faceing backward and upside down mad yes
hope it goes to plan cheers paul
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gazza285
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| posted on 18/1/07 at 06:11 AM |
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Should be ok as the CWP are running as designed.
DO NOT PUT ON KNOB OR BOLLOCKS!
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Coose
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| posted on 18/1/07 at 08:54 AM |
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quote:
Originally posted by CGILL
It'll work, you have a crush tube between the two pinion bearings, and running it in reverse loads this crush tube from the thrust created by
the hypoid cut. You'll get away with it on a bike engine because it doesn't have huge torque which would destroy this after a few heavy
clutch drops. You may get issues from the pinion bearings being starved of oil form being above the oil level. But lets face it, we're not going
to be doing 30,000km per year in these cars
You could always have a solid spacer made to replace the crush tube....
Spin 'er off Well...
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