akumabito
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| posted on 22/5/05 at 05:45 PM |
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Which diff on weird project?
I just got a weird idea, and I'm trying to figure out if it could actually work..
The idea was to take an engine + gearbox from a FWD car, and then rotate it 90 degrees so one driveshaft goes to the front, the other to the back, so
you could create a 4WD vehicle. (nevermind the rotated shifting pattern, lol)
But then it got me wondering about what to do with the diffs? The most obvious choice at first sight seemed to be Sierra diffs, but... a FWD gearbox
has it's final gear ratio already built into its own diff, right?
Say you'd use an Alfa V6 engine, the final ratio of its diff would be 3.353:1, now if you'd send that to two more diffs with a reduction
of 3.9:1, you'd be going nowhere!
I guess there aren't any 1:1 ratio diffs available huh? 
Anyway, I seriously doubt I'm the first one to come up with this idea, so maybe it has been tried before? Anyone has some more info on this
concept?
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Peteff
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| posted on 22/5/05 at 06:05 PM |
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You'd have to lock the middle diff as well, it's been discussed before but I don't think it went anywhere.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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johnston
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| posted on 22/5/05 at 07:04 PM |
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i think i read somewhere that trial cars or somethin are startin to go that way loadsa torque for gettin up hills and stuff but u need to rev the
nutts of engine
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britishtrident
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| posted on 22/5/05 at 07:29 PM |
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What wrong with the Sierra 4x4 system the Panther Solo generally regarded as the best handling road car of the late 80s/early 90s used it turned
through 180 degrees
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NigeEss
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| posted on 22/5/05 at 08:59 PM |
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quote:
Originally posted by Peteff
You'd have to lock the middle diff as well.
Why ?
Land Rovers have open centre diffs that you only lock up when serious traction is needed.
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akumabito
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| posted on 23/5/05 at 07:08 AM |
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Locking the center diff would be a bad idea, unless maybe if you're building an offroad vehicle..
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Peteff
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| posted on 23/5/05 at 09:27 AM |
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maybe if you're building an offroad vehicle
I assumed it was for off road. Seems like a pointless exercise for a locost type vehicle when you could use the ready made 4x4's and not have to
work out drive strategies and prop routing, diff configurations and engine location.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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NS Dev
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| posted on 23/5/05 at 11:16 AM |
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Myself and a mate have done this on two off roaders now. I think I have posted about it before but on the first one we used a mondeo turbodiesel
engine and gearbox, with welded up diff, turned 90 degrees, to drive 4 wheels of a spaceframed offroader.
top speed was approx 30mph though, which was exactly what we wanted.
The next one was really serious!!!
6 wheel drive, 6 wheel steering, independent double wishbone on every wheel, centre diff locked, disengageable drive to each "axle" so you
can have front middle or rwd or any combination of the above.
We used a 1600 turbodiesel engine from an early VW passat, where the engine and transaxle is longitudinal front wheel drive. We turned this 90 degrees
so the engine and gearbox were then transverse, with the outputs pointing forwards and backwards (if you see what I mean!) This meant that it slotted
in neatly behind the seats in the cab, taking up none of the load area at the back.
We used Lada niva front diffs on each of the 3 "axles", and lada Niva double wishbone suspension on each "axle".
I won't go on (think I did on here in the past about it) but it ended up with selectable 6wd, and selectable mode 6 wheel steering, mechanical
at the front with hydrostatic assist at the rear, with a lockout for road driving.
It was awesome, and could drive on peat bog so soft you sank in when you walked on it, and drove up 45 degree hillsides with consummate ease!
Again, around 30mph tops!
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Volvorsport
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| posted on 23/5/05 at 11:23 AM |
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volvo 340 have a diff , which transfers drive to the CVT belts , dont know what ratio is involved , might be worth a look ?
www.dbsmotorsport.co.uk
getting dirty under a bus
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akumabito
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| posted on 23/5/05 at 12:36 PM |
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quote:
Originally posted by Peteff
Seems like a pointless exercise for a locost type vehicle when you could use the ready made 4x4's and not have to work out drive strategies and
prop routing, diff configurations and engine location.
Not really.. over here there aren't a lot of cheap 4x4 vehicles.. at least not with any decent power outputs. The cheapest I can think of would
probably be the Opel Calibra Turbo, which, if you're lucky to find one in ok condition would sell for not less than 3500 euros.
FWD vehicles on the other hand are very plentiful, and comein all sorts of engine configurations, 3, 4, 6, or even 8 cilinders, with or without turbo,
really tiny 1 liter engines or large 4.6 liter engines, there's just so much choice.. 
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Peteff
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| posted on 23/5/05 at 12:51 PM |
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over here there aren't a lot of cheap 4x4 vehicles
We don't know where over here is as you haven't put it in your profile. Don't you have suzuki jeeps?, they seem pretty universal
vehicles under lots of names.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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akumabito
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| posted on 23/5/05 at 12:56 PM |
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Sorry, though I had put it in my profile.. I'm in Holland..
sure, we've got Suzuki Jeeps, they're still pretty expensive, and again, the goal is not to make an offroader.. Speed and handling
aren't exactly a Suzuki Samurai's strong points...
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