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cheap lsd
https://www.ausmini.com/forums/viewtopic.php?f=5&t=67850		 Page 1 of 2
Author:  ROBERTXX [ Sun Dec 26, 2010 6:30 pm ]
Post subject:  cheap lsd
had a wee read of this bit by david ,and thought, woof ,,lets investigate ..

''On the subject of gear boxes, Asphalt included the pic of the diff,BUT!!!!
go to Quaife's website, look at the details of the mini diff and down load the drawings[PDF at bottom of the page] Then do the same for the honda civic diff[2 bearing sizes 40mm and 35mm -- funny but 35mm is 1.375" ] and compare the 3 diffs.
Then get onto flee bay and do a search on "Honda LSD" and you will find a brand new ATB diffs made by OBX in USA for around $350 [some times cheaper] The blokes racing the v-tec civics in USA are punching around 300 neddys thru them and they are bullet proof. Crown wheel PCD is the same as mini ATB, but has 10 --10mm x1 bolts instead of 6-- 3/8" UNF
Two complete brand new civic drive shafts here about $100. No more stick in a bucket fit CV joints and no more oil leaks ''


so got my chap denis (11.9s 1/4 mini )to measure a pg1 diff same sort of dimensions as ..
honda y1 and y2 cable and hydro trannys as found on all b-series hondas

these are the sizes ..



Image


soooo this seems a fsair bit bigger than the a series ...am i measuring the wrong diff here like a numpty ??


regards
robert


_________________
Author:  74snail [ Sun Dec 26, 2010 6:38 pm ]
Post subject: 
PM David Rosenthal , he spoke about a Honda Integra diff being about 1mm out with some mods apparently he some updated ideas
.
Author:  ROBERTXX [ Mon Dec 27, 2010 6:58 pm ]
Post subject: 
i thought about it ,but felt it may be a topic of general interest for those with high powered 200 bhp plus 5 ports and so on .so started a thread . hopefully david may be along to set me straight :D
Author:  david rosenthal [ Mon Dec 27, 2010 11:10 pm ]
Post subject: 
Robert, wrong diff . The ones I was refering to are out of a honda civic, crx. The integra will fit ,with a bit of stuffing around ,but the civic/crx are identical to the quaffe except the crown wheel is held on by 10 X 10mm LH threaded bolts and the mini is 6 x 3/8" bolts.
I will dig up the drawings off the quaffe site and post them.
The cheapest diffs are OBX and if you do a search on ebay under "honda LSD' you will find heaps of them for around $350 brand new.
Author:  ROBERTXX [ Tue Dec 28, 2010 4:22 am ]
Post subject: 
thanks david ,ill try and find one down the scrappy and have a compare .really appreciate the data .
Author:  Kennomini [ Tue Dec 28, 2010 1:17 pm ]
Post subject: 
So it's just the mounting pattern of the crown wheel which stops this from bolting straight in? Can the mini CW be machined to match the Honda LSD?
Author:  drmini in aust [ Tue Dec 28, 2010 2:33 pm ]
Post subject: 
Kennomini wrote:
So it's just the mounting pattern of the crown wheel which stops this from bolting straight in? Can the mini CW be machined to match the Honda LSD?

Mini crownwheels are heat treated and are tuff stuff, but if you have serious (eg CNC) machining gear, yes they can be re-machined.
It is common to machine them when fitting to a Salisbury LSD.
Author:  mickmini [ Tue Dec 28, 2010 2:48 pm ]
Post subject: 
can you order the Honda ATB without holes and drill to suit Mini CW?

That would seem the easier route to me ...

cheers
michael
Author:  TheMiniMan [ Tue Dec 28, 2010 10:07 pm ]
Post subject: 
hee hee,,, have fun if machining the mini crown wheel,,, ceramic tips are a suggestion but you`ll probly bust a few of those in the process too :-)

i`ve done heaps of them but i doubt you`ll be able to persuade me to do anymore of them these days
Author:  david rosenthal [ Tue Dec 28, 2010 10:22 pm ]
Post subject: 
Like most things there is a little trick in machining mini crown wheels. Yes you do need GOOD tips but !!!!!!!!!!!!!!!!!
I have done quite a few, the hardest part is drilling the holes ,but again a trick or two.
So far I have never found a single item on a mini that I can not machine, even idler gears for taper roller conversions.[Ask Bernard in NZ he has got one]

EDIT
just to prove that it is not hard to do crown wheels and I have only a reasonable tiawanese engine lathe [no CNC in my workshop] and use only a good quality tungstan tip inserts.
A 3.44 crown wheel bored to fit a honda civic diff. Use 2 of the holes and srink fit pins into the rest and re-drill to suit the honda diff.
Image
and this little one. a gear machined out of a 3 syncro lay gear . I use 2 of them for my 6 speed gear box. Try machining honda stuff, mini gear is like plastic compared to that, but not impossible to machine.
Image
Author:  Kennomini [ Tue Dec 28, 2010 10:37 pm ]
Post subject: 
Hey David you should really move to the Sunshine Coast with all your tools and equipment. Your wife would love the coastal lifestyle and you could help me with all my stupid mini related mods I want done, what do ya say :D
Author:  TheMiniMan [ Tue Dec 28, 2010 10:44 pm ]
Post subject: 
well , how`s about instead lets all just move in together in a more of a "middle of the road" type place,,, like Byron bay yeah????? ;-) ;-) ;-)
Author:  Phat Kat [ Tue Dec 28, 2010 11:03 pm ]
Post subject: 
TheMiniMan wrote:
well , how`s about instead lets all just move in together in a more of a "middle of the road" type place,,, like Byron bay yeah????? ;-) ;-) ;-)


HELL YEEEEAHHH!!!!!!!! :D 8)

Machining crown wheels... Sounds scary... probably a job for a machinist :P
Author:  david rosenthal [ Tue Dec 28, 2010 11:16 pm ]
Post subject: 
Phat Kat wrote:
TheMiniMan wrote:
well , how`s about instead lets all just move in together in a more of a "middle of the road" type place,,, like Byron bay yeah????? ;-) ;-) ;-)


HELL YEEEEAHHH!!!!!!!! :D 8)

Machining crown wheels... Sounds scary... probably a job for a machinist :P


I am just a useless old pig iron polisher that did a engineering trade[including advanced machining and toolmaking] and I am quite happy living in the back blocks . NO bloody neighbours to complain about things :lol: :lol:
But on a serious note there are many tricks that I have learnt in nearly 45years and if you want to know just ask.
Crown wheels. They are case hardened, the rough part the surface is hard but only to about .010". The original bore is not. You cut into the softer material and machine out under neath the case hardening. Then when you get to final size slow speed, light cut, but reasonable feed rate and plenty of coolant . NEVER let the tool rub on the metal as it will harden the steel more. Just cut straight into the case hardening and rip thru it.
Author:  Phat Kat [ Tue Dec 28, 2010 11:28 pm ]
Post subject: 
No substitute for expereince as they say :) Always good to read your posts David.
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