What breaks....

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What breaks....

Postby shoveitnz » 21 Jan 2007, 21:11

what exactly breaks inside a standard axle when it dies?
Having a look at the two axles i've got theres quite a difference in size of components but I'm curious as to what lets go first in the 1256 axle?
Image
HS left - 1256 right
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Postby Tortron » 21 Jan 2007, 21:55

i would imagine that the splines break off, hence the little chunks of metal found in busted diffs
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"as you would expect on a car of this age..."
The chevette vin decoder
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Postby shoveitnz » 21 Jan 2007, 22:01

Monday morning? back to work...or is it smoko time?

Maybe I should just try the stock diff- kill it and then find out what breaks?
I'm just thinking that a rotary doesnt pump out enough torque but I spose with enough power then it'll do something.
NZ desperately needs more immigration and fresh blood. Our eyes are getting far too close together!

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Postby Tortron » 21 Jan 2007, 22:08

na, im a dirty student and have another month off. plus no job, so yay for me.

i think that that is a fantastic idea, tho being a rotary its likely to blow up before the diff breaks
This text comfirms the fact that directly above this is a line
"as you would expect on a car of this age..."
The chevette vin decoder
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Postby shoveitnz » 21 Jan 2007, 22:33

heeeeeeyyyy- they're not that bad.... problem is that rotarys dont die a slow death like other engines- they die quick!
My last rotary did 120,000 miles! Then one rotor stop sealing one one or more tips and....
They need to be warmed up properly before thrashing them too (the steel and alloy housings warming up at different rates) which i bet alot of people dont follow.
Anyway..back to axles. have you ever broken one or know some one who has and with what motor?
I'm off to bed- not on holiday and crap TV to blame.
NZ desperately needs more immigration and fresh blood. Our eyes are getting far too close together!

http://retrorides.proboards86.com/index ... 155&page=1

http://www.vauxhallviva.com/vivaforum/v ... hp?t=10258
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Postby Herbie_Flowers » 21 Jan 2007, 23:48

me and my mate went out for a shakedown in his Talbot Sunbeam that had had a Ti engine fitted and broke the diff in it after a couple of miles. don't know exactly what had gone wrong because we were only cruising at 70ish and not exactly straining it but it stalled the engine and cruised to a halt ok. i can only guess at either the Crown Wheel or the Pinion being the problem as it towed home ok.
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Postby CancerWagon » 22 Jan 2007, 00:39

I've broken 3 rear ends in chevettes with the 1600cc. From that pic it's very similar to the 1256cc's rear end. The pinion was always okay, the ring-gear usually had some chipped teeth (nothing bad) but the showstopper was always the two smaller gears in the carrier, on the pin. The axle gears came out just fine.

MY THEORY is that when I was out arsing about, damaging the ring-gear, the metal chips that had come off eventually jam up in the 4 diff gears, snapping one. The second one shortly after with the fragments of his departed brother making it all that much more hazardous.

The CancerWagon (tm) broke a diff like this going 6kph under no load. Not a snap, or a bang, of a full throttle start, but a simple *TING* on flat tarmac, and it was all over.

So no matter what diff you use: PUT A STRONG MAGNET ON THE LOWER INSIDE OF THE DIFF COVER! Make sure it stays put, with some good epoxy glue:!:
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Postby Gordo » 22 Jan 2007, 06:42

To be honest, I don't really care what breaks internally - what I'm s*** scared of is the torque tube failing and causing major damage or a bad crash!
ttfn

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Postby roadrally » 22 Jan 2007, 23:50

Ive done in 3 axles aswell. 2 std chevettes and an HS. First of all im running a Ford 1300 x-flow motor (100 bhp ish (flywheel)) on road rallies. First 1 was the pinion, it snapped! second time it was the planet gears (the 4 small ones in the middle. The last 1 was the HS, first event after building the axle, i had a minor off but stopped very sharp and think the impact shot through the drive train and took 3 teeth off the pinion! It still drove and we managed to get a finish :) needless to say i fitted a brand cwp set not 1 thats done god knows how many miles and is hitting 30 years old! The weak point of the HS axle is the front rubber dounut, my mate used to have his work itself out of the mount. Not heard of many other problems.
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Postby shoveitnz » 26 Jan 2007, 21:59

How many out there have broken standard axles with peppy motors in chevettes?
a pole?
NZ desperately needs more immigration and fresh blood. Our eyes are getting far too close together!

http://retrorides.proboards86.com/index ... 155&page=1

http://www.vauxhallviva.com/vivaforum/v ... hp?t=10258
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Postby 1.8KADETT » 01 Feb 2007, 23:41

I'm running a standard 1200 auto axle in my kadett with an 1800 manta lump in front of it- I thrash the nuts off it regularly but still no problems!

Might have something to do with the complete lack of traction from my lovely 'Road Champ' tyres though.... :P

It'll spin up right through to fifth in the wet!
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