peterriley2
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| posted on 21/6/06 at 02:44 PM |
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4x4 bec locost- stupid idea?
im just exploring options really, would this be completely impossible and stupid? im getting a 4x4 sierra donor in the next few days, and i just
thought the obvious thing to do would be to use it to make a 4x4 locost. ive got my heart on a bec, but id guess the combination wouldnt go together,
and the added weight would make it pointless? please post your views, and i would be interested if anyone is making a 4x4 locost...
[Edited on 21/6/06 by peterriley2]
Joel
If you dont respect yourself, dont expect respect from anyone else
Live your dreams, dont dream your life
Women only want you for one thing- everything!
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mookaloid
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| posted on 21/6/06 at 02:52 PM |
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There are some 4x4 seven type cars - Dax is one of them. They rely on the 4x4 drive train i.e. gearbox to distribute the power to the wheels.
As a BEC doesn't use the gearbox from the 4x4 drive train, it would be quite a task involving some other transfer gearbox which I personally
have not heard of.
Perhaps someone else has though.....
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nick205
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| posted on 21/6/06 at 03:25 PM |
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I would have thought the weight and friction penalty of the 4x4 transmission would sap a bec's power quite a bit. Also as Mook says,
transferring the power from a bike engine to the 4x4 transmission is probably not an off the shelf or cheap solution.
You could possibly use a chain drive set up to transfer power from the bike engines integral gearbox to a centre diff from a freelander or something
similar.....?????
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ned
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| posted on 21/6/06 at 03:29 PM |
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its been done with two bike engines by tiger/zcars but impractical, expensive, makes the car heavier will struggle to put the power down/torque steer
and with transmission losses etc you're better keeping the weight down with a conventional single bike engine rwd.
beware, I've got yellow skin
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stevebubs
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| posted on 21/6/06 at 03:42 PM |
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quote:
Originally posted by ned
its been done with two bike engines by tiger/zcars but impractical, expensive, makes the car heavier will struggle to put the power down/torque steer
and with transmission losses etc you're better keeping the weight down with a conventional single bike engine rwd.
Yup...The Z Cars Tiger used some serious Motec hardware to make it try and go round corners.
do a search on the dp1 for a 4wd bec...
S
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Marcus
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| posted on 21/6/06 at 04:07 PM |
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Dunno about 4wd BEC, but Liam is doing a 4x4 locost with a Honda V6
Marcus
Because kits are for girls!!
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Liam
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| posted on 21/6/06 at 04:20 PM |
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You could have the transfer case off the back of a ford 4x4 box and use that with the bikes gearbox if you really wanted. Would have to do a couple
of mods to provide a drive flange or some such to the transfer case and keep the oil in it.
You'd add about 50kg which is significant for a bec. As has been said probably not worth it unless of course you're planning on a
turbo'd hayabusa or something. A normal bike engine struggles to spin 2 wheels.
You could of course argue that even with a turbo'd hayabusa you dont need 4wd! But one of the main reasons i'm doing a 4wd is just
cos I can 
Liam
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Wadders
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| posted on 21/6/06 at 05:41 PM |
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'A normal bike engine struggles to spin 2 wheels.' ???
Yes once your in 3rd or 4th it does
Al
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froggy
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| posted on 21/6/06 at 05:57 PM |
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if you go for 4wd the first thing is to bin the v6 and use something lighter as me and liam have done ,as the best you can hope for is around 150hp
and big lumps sticking out of the bonnet if you keep the cologne motor
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andybod
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| posted on 21/6/06 at 07:09 PM |
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if you really wanted to go bec 4x4 you could use a suzuki sj413 transfer box which has selectable 4 wheel drive but is quite large for a seven type
vehicle but compact as far as transfer boxes go
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PAUL FISHER
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| posted on 21/6/06 at 07:34 PM |
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quote:
Originally posted by Wadders
'A normal bike engine struggles to spin 2 wheels.' ???
Yes once your in 3rd or 4th it does
Al
I am pleased you put him right on that one wadders,I nearly choked on my coffee when I read that bit
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Liam
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| posted on 21/6/06 at 10:16 PM |
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OK OK i'm sorry bec boys! I meant, of course, relative to a torquey car engine! If any flavour of seven is least likely to suffer
traction problems and benefit from 4wd it's a standard bec. I've driven a blade engined westy round a track and you could pretty much
nail it out of every corner. But I guess i would only have been down below 3rd gear on the tight hairpin.
Liam
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Liam
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| posted on 21/6/06 at 10:26 PM |
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quote:
Originally posted by andybod
if you really wanted to go bec 4x4 you could use a suzuki sj413 transfer box which has selectable 4 wheel drive but is quite large for a seven type
vehicle but compact as far as transfer boxes go
I've heard that even the standard 1(?) bhp suzuki engine tears these apart. Dunno myself, but the real downside is there is no centre diff -
when 4wd is engaged the front and rear axles are locked. No good for tarmac. That and you're lugging around the gubbins for selectable high
and low ratios with you.
The arse of a ford 4x4 box on the other hand would be very compact and provide you with a mechanical centre LSD and a 2/3 rear power bias.
You'd just need to make a plate to seal up the gaping hole in it where a ford gearbox used to be and connect it to the bike output somehow.
Liam
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