JoelP
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| posted on 1/10/04 at 06:50 PM |
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welding shut a diff
might be a stupid idea, but would it be possible to use a 4wd box in a locost by simply welding the front/back diff cogs up? and then just loosing the
front end gubbins. Sounds too easy and a little bodge like, but some of the best techniques are bodges that stood the test of time...
i feel like draggin myself out of depression by buying a silly big ford v6 to go in my silly big car...
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Mark Allanson
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| posted on 1/10/04 at 06:59 PM |
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Making up some locking plates up on a lathe might be a bit more 'engineering', but I think that the idea might be sound
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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zilspeed
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| posted on 1/10/04 at 07:28 PM |
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I have had similar thoughts involving Audi Quattro in line power trains.
I reckon that might make a monster power train 
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phelpsa
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| posted on 1/10/04 at 07:54 PM |
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autograss mini drivers often weld their diffs up.
Adam
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JoelP
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| posted on 1/10/04 at 08:54 PM |
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sod it, xr4x4 it is then...
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blueshift
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| posted on 1/10/04 at 09:27 PM |
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If you're thinking of welding or bolting one side of an xr4x4 centre diff, I think it's viscous and therefore will overheat / otherwise go
bang if you do this.
I could be wrong.
plus you'll turn it into a 1:2 ratio gearbox.
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JoelP
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| posted on 1/10/04 at 09:47 PM |
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i dont mean welding one side up, i mean welding all the cogs up so it becomes just another cog.
imagine getting a standard sierra back diff and welding all the little cogs together, so it was a zero slip diff.
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NS Dev
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| posted on 1/10/04 at 10:17 PM |
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This is a modification that is widely used in Autograss, in most classes.
My class 9 special (see photo archive) has a welded up diff in it's Vauxhall F20 gearbox. It's the best way to lock a diff short of
machining up a solid "spool" to mount the crownwheel on.
Weld the output gears solidly to the carrier, and then weld the planet gears to the output gears both sides on each planet gear. Weld a bit at a time
and allow to cool regularly so you don't distort too much and don't wreck the bearing mounting faces.
This advice unfortunately is for a conventional diff, not an epicyclic like the sierra centre one, but the principle is identical.
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James
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| posted on 1/10/04 at 11:42 PM |
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quote:
Originally posted by JoelP
i feel like draggin myself out of depression by buying a silly big ford v6 to go in my silly big car...
Better still, go meet someone who has a built car and get a ride- that always inspires me!
Is this plan for before or after SVA?
Perhaps after might be a good idea!
Cheers,
The ever-plan-changing one. 
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JoelP
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| posted on 3/10/04 at 11:06 AM |
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unfortunately i think it needs to be before SVA! it all stems from a lack of poke, the fact that i want an LSD, and that the back end needs redoing.
So to kill three birds with one big sierra, im just gonna get a 4x4 and waste a few months (years?!)
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johnston
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| posted on 3/10/04 at 02:31 PM |
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why not just sell 4x4 box and buy a type 9????
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JoelP
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| posted on 3/10/04 at 07:40 PM |
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because the regualr type 9 doesnt last long on a v6, as the input shaft is shorter. You have to mess about and get an xr4i box. id rather just save
the effort if possible.
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Chris Green
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| posted on 3/10/04 at 07:59 PM |
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Wouldn't any V6 type 9 box do?
I'm sure you it would be easier, and less costly to do this?
I know the V6 boxes are rarer than the 4 pot type 9', but they are about?
What about a granada / scorpio? did they make a RWD V6 one?
Regards,
Chris.
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JoelP
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| posted on 3/10/04 at 08:04 PM |
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well i guess they may, but the xr4i is the only v6 2wd sierra that springs to mind. i suppose a granada box might work, but id rather not buy a box
seperate cos you cant be sure it works then, and i dont want to buy two whole cars to break.
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andyps
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| posted on 3/10/04 at 08:06 PM |
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quote:
Originally posted by JoelP
... and i dont want to buy two whole cars to break.
But then wou would have a spare LSD to sell and there will always be people like me who would be happy to buy it off you for a reasonable price
Andy
An expert is someone who knows more and more about less and less
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JoelP
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| posted on 3/10/04 at 10:30 PM |
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probably not, as most of the 2wd cars, (inc xr4i), do not have LSD fitted as standard!
after some thought, the 4x4 box wont fit in my car, and i cant bear to throw away the exhaust i made for the pinto, so im just gonna find the rear
rubber diff mount, bodge it in, and get the car tested sharpish. Ive got the second bike engine lined up now so its time to make progress on mk2!
[Edited on 3/10/04 by JoelP]
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JoelP
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| posted on 3/10/04 at 10:41 PM |
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Rescued attachment twin2.jpg
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locoboy
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| posted on 4/10/04 at 08:16 AM |
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Joel,
are you planning 2 x zx9 power through one prop ala tiger stylee?
Or are your going to go one powering rear and one powering front?
IIRC wasnt there a mountains worth of cash spent on electronic trickery to get the rear drive only car anywhere near drivable?
ATB
Locoboy
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JoelP
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| posted on 4/10/04 at 11:26 AM |
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im planning on sticking both in the back of a custom middy. i would've thought that it would be harder to have one front and one back than it
would be to have both turning one diff. at least when turning one diff they engines have to rev the same.
People have suggested in the past that one engine may end up pulling the other. I dont think this will be a problem, as when you are in gear the revs
dont rise as fast as when blipping it in neutral. hence the engines both will have to work. I do expect that they will need rejetting to ensure that
both are doing a similar amount of work.
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