Page 2 of 2
Posted: Tue Sep 19, 2006 1:59 pm
by SupraLux
Yeah, I've looked at the Combi setup... was going to use something like that... and Reece, the Cobi campervans - they have a portal rear axle.
I've worked out I could run 33" tyres, and also get more reduction meaning I could also run cheap-as-chips and strong-as-mules 4.3 diffs and still have better gearing that 5.29's on 36's and more diff clearance than 38's
Thats gotta be the way to go
I'm off to the shed
Steve
Posted: Tue Sep 19, 2006 5:28 pm
by JTop
The diffs are upside down because when you have a 2 gear reduction you have 4 reverses and 1 forwards
The VWs fixed this by swoping the C/W to the other side of the pinion
J Top
Posted: Tue Sep 19, 2006 5:40 pm
by Insky
r u serious i could by a vw combi jack it up on 33's ? has this been done ? im keen
Posted: Tue Sep 19, 2006 5:44 pm
by JTop
only the early Kombi's had them
J Top
Posted: Tue Sep 19, 2006 6:23 pm
by mercutio
JTop wrote:only the early Kombi's had them
J Top
to be more specific they were only fitted to the german assembled combis the same combis that had porsche assembled engines
the brazil assembled ones never used portals
Posted: Tue Sep 19, 2006 7:17 pm
by De-Ranged
Damm I was right they are gona be hard to find...
Oh well I'll keep looking at comercail planitery's
if its good enough for heavy machinery it'll be strong enough for me
looking at some that are fitted to certain forklifts.... just uncertain how they will handle the increased revs
Oh by the way imagine portals on an Ind sus truck
yea baby my wanker will rock
Cheers Reece
Posted: Tue Sep 19, 2006 9:31 pm
by lilpigzuk
hmmmmm, must talk to bro in law, being a VW nutter. He must have some contacts..
Posted: Mon Oct 30, 2006 11:34 am
by gomulletgo
I just read that link DAMM! Holy hell I did the math 8 transfercases to get enough gears to make the portals.... I like it but there has to be a less gear intensive option
Just a thought (I have no engineering experience).
Why do they hav to be transfer case gears? why not just the gears from a gearbox from some car that no one likes and there is heaps lying around. like mid 80s honda integras or accords or something. or even 80s ford falcons (whole cars constantly selling for $400)
MULLET
Posted: Mon Oct 30, 2006 11:46 am
by lilpigzuk
gomulletgo wrote:I just read that link DAMM! Holy hell I did the math 8 transfercases to get enough gears to make the portals.... I like it but there has to be a less gear intensive option
Just a thought (I have no engineering experience).
Why do they hav to be transfer case gears? why not just the gears from a gearbox from some car that no one likes and there is heaps lying around. like mid 80s honda integras or accords or something. or even 80s ford falcons (whole cars constantly selling for $400)
MULLET
From the link back on page 2.
To simplify construction and minimise costs,I tried to use as many old LandRover bits and pieces as possible.Each box contains 2 pairs of relatively narrow straight cut gears siamesed together to form 2 wide gears. The gears are actually series 1 and series 3 transfercase gears. The upper(small)gears are the low range section of series 3 intermediate gears, scotch pinned to 24 spline carriers. The bottom (large) gears are the low range slider gears from series 1 or 2 t/cases, mounted on cut down and bored out t/case output shafts with an internal spline broached in them.The rear boxes bolt to a RangeRover banjo housing. the upper halfshafts are series 2/3 aftermarket 24 spline. the bottom shafts are full floaters ,they are LR FC 101 21 spline pattern on bored out 110 hubs mounted to modified 101 spindles. All gears run on tapered roller bearings, and the bearing housings are made from the flange and throat of old scrap series swivel housings
Bill basically is a landy nutter so has probably a heap of landys at his diposal to get parts from. I would say tha due to the size and Width and cut of the gears is why he used them for the portals. Gearbox tend to have quite small gears and are helix cut (I think thats the right term
)
Posted: Mon Oct 30, 2006 2:26 pm
by gomulletgo
http://science.howstuffworks.com/gear3.htm
"This gradual engagement makes helical gears operate much more smoothly and quietly than spur gears. "
sounds like it could only be good to me, I think I read a link somewhere where bill said the portals were noisy. the helicals could help this problem.
Gearbox tend to have quite small gears
don't know whether you mean small or narrow but......if it's narrow could'nt you just put three side by side? (he already has them doubled up by the sound of it).......if you mean small, well then could'nt you do a 3 gear portal set? ie. clockwise, anticlockwise, clockwise.
would take out that problem with flipping the diff or whatever that I think steve was talking about.
correct me if I'm wrong. (I'm used to it)
MULLET