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]
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.....
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.....?????
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.
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.
Dunno about 4wd BEC, but Liam is doing a 4x4 locost with a Honda V6
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
'A normal bike engine struggles to spin 2 wheels.' ???
Yes once your in 3rd or 4th it does
Al
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
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
quote:
Originally posted by Wadders
'A normal bike engine struggles to spin 2 wheels.' ???
Yes once your in 3rd or 4th it does
Al
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
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