Slider
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| posted on 4/12/07 at 07:07 PM |
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Bec Diff
Hi All,
First post here, great site. There's so much info here that i need a bigger memory.
I'm missing the point somewhere along the line so maybe someone can set me right.
I'm about to build a Blade buggy type thing from scratch. The main building is not a worry as i am a welder/fabber but some would argue that,
lol.
I have an old 96 Blade ready for the use of and also an Alpha gearbox/diff (33 i think) kicking around.
I understand the Alpha box has a ratio of 1:1.027 in 4th gear so isn't that virtually 'what goes in, comes out'? Why can't my
Blade connect to Alpha box and leave it in 4th or reverse?
There must be a reason why folks don't do this but i can't see what it is.
Who's first to make me look daft?
Cheers,
Slider.
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zxrlocost
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| posted on 4/12/07 at 07:09 PM |
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hi
1 where are you going to the put the external gearbox
2 surely it weighs as much as the original bike setup?
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Paul (Notts)
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| posted on 4/12/07 at 07:14 PM |
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connecting a bike engine to a car gearbox is very difficult
you end up with lots of extra weight
TWO gearboxes - the bike one and the car
connecting from the bike engine/gearbox to a rear diff is the simlest option and the lightest ( unless you chain drive the rear axel )
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bonzoronnie
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 posted on 4/12/07 at 07:21 PM |
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Gearbox
Hi,
Clutch, flywheel, the problems would be endless
Ronnie 
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Slider
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| posted on 4/12/07 at 07:22 PM |
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That was quick replying Guys.
I should of mentioned its going to be a midi. I havn't actually seen the Alpha box for a while so i cant say how heavy it is but from memory,
it's not huge. Plus i could trim off all the casing where the car clutch would be.
Yeah, two gearboxs in theory but would it be that much heavier than one of these quaiffe type diff things with reverse in them?
Slider.
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Paul (Notts)
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| posted on 4/12/07 at 07:28 PM |
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How would you connect the bike gearbox output to the input of the gearbox ?
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Slider
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| posted on 4/12/07 at 07:38 PM |
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Again, i'm thinking from memory but i think there should be a splined shaft on the alpha that would originaly sit in the clutch. The Blade has a
splined shaft too. It's only abit of machining me thinks or even welding a machined clutch center to my exsisting machined blade sprocket with a
UJ inbetween.
I'm not too worried about the making it fit side of things, its more the ratio stuff. Weight and fitting aside, would it work do you think?
Slider
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lsdweb
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| posted on 4/12/07 at 07:59 PM |
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If you can get it lighter than this please let me know!!!
Wyn
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Slider
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| posted on 4/12/07 at 08:12 PM |
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quote:
Originally posted by mangogrooveworkshop
why use a box
Well it has the diff combined and can have inboard brakes so its not just a box. The theory was that for your extra weight you get reverse built in
and also you get more varied gearing.
With no clutch on the alpha side, it might be a pain to change but... stick in 4th for usual driving i.e 1:1 ratio, perhaps 3rd for a low speed, high
acceleration hill climb type event or even 5th if your off down the motorway for miles.
It makes sense to me but then like i said, am i missing something obvious?
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mark chandler
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| posted on 4/12/07 at 09:41 PM |
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Its sounds fine in theory, I guess the fear is that the G/box will dull the engine in reality.
1:1 ratio would be straight through so minimal frictional losses, but yours is not 1:1 so you will be spinning some gears so may get <15% power
loss.
The weight is also a concern as this will also dull the engine, however the only extra I suppose over a diff is a bit more casing and some cogs so
maybe not that much.
Also seating, in a 7 type car you cannot afford any more width in the TX tunnel so you would need to sit above this lot, not by it.
For joining I do not see an issue if you can fix the engine solidly to the gearbox, but a slide and UJ's would not suit the first motion shaft
as this is expecting good alignment, so you would need to build a solid cradle and work out how to fix a clutch centre onto the blades splined shaft
(but you do save the weight of a propshaft) so unfortunately front engine is out unless build a bearing to support this lot within the existing bell
housing, again adding weight + prop.
Regards Mark
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NigeEss
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| posted on 4/12/07 at 11:02 PM |
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I think this is a very, very interesting idea. Yes it has issues re weight/connection but I would love to see the results.
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Slider
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| posted on 4/12/07 at 11:13 PM |
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Hmmm, 15% loss eh Mark? Its abit much really i reckon. Its going to be a midi off roader so tunnel space is no probs and i have no chassis yet so the
cradle can be designed in but.. 15%. Doh!
I suppose i'll have to dig it out and weigh it, chop bits off it etc and go from there. If its not too big it might be worth a try.
Cheers All.
Slider.
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robertwa
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| posted on 5/12/07 at 03:37 AM |
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I remember seeing an alfa 33 box a few years back when I put the alfa engine in my VW camper. It looks nice and compact.
I think this could be an interesting idea. If you removed 1st, 2nd and maybe 3rd gears I would like to her how light it would be. 4th for regular
driving, 5th for over drive and reverse. You could mount the alfasud inboard brakes too.
Do it, and let us know 
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