finding 33" tyres

[Mr Noisy]

Well, good luck with that!

Looking about online it's only the boys in Brazil that seem to be fitting these, tyres direct publicised that they had stock a fair few months ago now but so far I haven't even heard of anyone in the UK fitting these, you could be the first and/or one of a few.

Built on Maxxis casings you know they're going to be good strong casings and the spacing between the tread blocks is going to be like boggers for paddling, I think you'll have success, they seem to stand quite square actually.

Overall I gotta say props for buying the random choice! :£

 

[Co-Pang-Yang]

Let's hope I don't live to regret my decision to go against the grain lol

 

[jpbacs12]

Interested to see what happens pal.

I've never broke a 10 spline shaft and don't think I will, have twisted em mind but I reckon 24s break easier!

I know what you are saying but, the 24 splines technically speaking should be able to spread more of the load across more metal surface, in theory making them stronger, then its down to what they are mae with how the are treated etc.

Maybe you were just in an aggressive time of your live driving lol

 

[Paul D]

Last time in Yorkshire moors and forests a few weeks ago we'd only been out a couple of hours before the first half shaft went .. then two more in quick time followed ..

They were wearing 35" or larger tyres, but also, and more importantly I think, fitted with diff lockers!

Those of us with open diffs and smaller tyres didn't break anything on the drivetrain .. Just thought you ought to know ..

 

[Mr Noisy]

The NORT boys are predominantly all 24 spline, lockers and 37s

So it's no surprise they're shafts/cvs go

Jpbacs, it's not the splines themself that break it's the shaft, usually it breaks at the splines as it happens but it's not due to the amount of splines

My 10 splines suffer quite a lot of impact bruising on the spline faces because there are fewer of them as you say whereas 24s do not so much

All I know is that I have given mine some serious boot over time fully locked with the v8 at 6 grand in 2nd bouncing my way up styal end, I really should have broken something and tbh on 24 spline definitely would

I think 10 spline shafts twist a lot more so they can take more shock abuse than 24 however 24s are harder and then can cope better with larger tyre sizes overall but simply can't handle the shock.

That's my theory anyway.

I've had lockers in for a few years now and regularly the boot goes in too and once that things on cam it's not giving in to a halfshaft any time soon, frankly I'm surprised to have not broken a shaft.

It's bizarre but all I know is 24 spline stuff often on 33s and smaller gets broken all the time.

Tyre size is the main decider of course and I'm fully certain 33" is the safety limit.

 

[Paul D]

Aww you had to explain it, I just wanted to worry him again ..

Different perspective, I don't think the tyre size mattered anywhere near as much in breaking them as the lockers did! What I mean is, those of us with open diffs did exactly the same sections, _everyone_ had to winch at some points, but it was so slippery that the lockers were still spinning up .. but it wasn't the spinning up that did it, it was mostly when there was a lot of grip, but more external pressure 'cos steep uphill, so the tyres gripped, the lockers tried to turn and something gave .. We with open diffs also got grip, but spun as well on different axles, thus relieving drivetrain pressure!

Moot point anyway, it's probably all a combination of forces that breaks drivelines, it's almost never 'this' or 'that' on it's own ..

 

[Co-Pang-Yang]

You lot are not helping

 

[Mr Noisy]

Well in that sense paul it's the tyre size definitely, having the diff locked means the axle shafts are handling all the return torques from the wheels and if that tyre is huge it can out a lot of torque on the shaft whereas the open diff would allow the torque to run away.

At the same time if the tyre was smaller it wouldn't make the threshold to break the shaft.

I'm a bit of an oddity because I don't know of anyone else with 10 spline lockers so it's hard to compare!

 

[DiscoPol]

when running some spurious french made 33s last year with the same locker and shafts nothing broke, when i changed over to simex type tread in a slightly smaller size (235/85/16) of only 32 ish i snapped two shafts in quick succession, admittedly i have just done a straight through exhaust that gives quicker spool up on the turbo and a sound you want to hear, so may have been using the loud pedal a tad more too.

Im 25 spline BTW and they always seemed to snap close to the drive flange and not near the splines, either way they are nice bits of rubber you have ordered and am looking forward to seeing them on the Landy

 

[jpbacs12]

Mr Noisy from what your saying its for sure the torque forces on the shafts, if there is more brusing on the 10 splines the must be more slip before the torque passes through, and the 24 bangs the torque straight down the shaft twisting it immediately hence snapping the shaft the bigger tyres and lockers multiply all these forces!!

I will wander around and have a chat to one of the guys in driveline and see whats they say the limits are. I know for one thing those boys dont have abuse the dev cars on a driveline rig and down at eastnor castle but ofcourse running standard gear.

 

[Paul D]

Funny how they break, two broke (one long one short!) right on the outside, so easy to retrieve, one broke just on the diff output, so a bitch to get, but an extending magnet did it (TimE).

Funny things to work out, forces. Mostly breakages are down to, I think, the actual half-shaft material, heat treatment and tolerances. The driver, diffs and tyres just add different forces onto them in different ways.

At least they're a known weak point .. better than breaking, say, a hub casting, or swivel ball .. oh, did I say swivel .. sorry ..

 

[DiscoPol]

Funny how they break, two broke (one long one short!) right on the outside, so easy to retrieve, one broke just on the diff output, so a bitch to get, but an extending magnet did it (TimE).

Funny things to work out, forces. Mostly breakages are down to, I think, the actual half-shaft material, heat treatment and tolerances. The driver, diffs and tyres just add different forces onto them in different ways.

At least they're a known weak point .. better than breaking, say, a hub casting, or swivel ball .. oh, did I say swivel .. sorry ..

I blame the tyres for sure on mine, it was on the same hill both times, very steep with sticky clay surface, so all the weight transferred to the rear pushing the simex into very sticky so very grippy clay giving loads of grip and with the locker locked and the tyres gripping something had to give way, bang went the shafts Im now thinking of flogging the tyres and going for something less grippy as i dont want to lose the diff.

 

[jpbacs12]

Cant you control the slip angle or ARB? By that I mean how the arrive at the point fully locked. On race car I have just turned down the ramps so the would smoothly arrive at fully locked as opposed to bang im locked, I have no knowledge of ARB lockers but plenty with helical and platted diffs. what i spoke about above only applies to plated, and at a guess id say ARB the are just slides a pin in and hey presto you locked?

 

[Mr Noisy]

Yes mate they are a 4 pin diff centre which has outer sliding rings that lock the sun gears to the casing.

Clever design but no limited slip.

In theory they are kinder to driveline because you do not get wild spinning and shocking etc, but what does happen with a locked axle is the whole car weight can get loaded up on one wheel and you can apply guaranteed torque to it whereas an open diff will send the power to the easiest option, a locked diff sends power guaranteed but if the tyre says no and the engine says yes then the shaft goes bang!

 

[DiscoPol]

Yes mate they are a 4 pin diff centre which has outer sliding rings that lock the sun gears to the casing.

Clever design but no limited slip.

In theory they are kinder to driveline because you do not get wild spinning and shocking etc, but what does happen with a locked axle is the whole car weight can get loaded up on one wheel and you can apply guaranteed torque to it whereas an open diff will send the power to the easiest option, a locked diff sends power guaranteed but if the tyre says no and the engine says yes then the shaft goes bang!

Aint that the truth

 

[Mr Noisy]

BASICALLY the overriding truth here is

If the tyres are the weakest link you will not break anything.

The motto being "wheel spin is cheap"

 

[jpbacs12]

lol for sure, its a little different where you talking billard table tarmac!!

 

[disco147]

Yes I agree it's only occasionally on full bump you get rub but this can be too often!

It does look well as it is and I often look at mine and think 33s are just a tad too small, but I think of my halfshafts too and find solace!

When it comes to lanes, lowness is key. I have sneaked down tight lanes without a kiss where others in jackers have destroyed roof panels and alpine lights.

I have zero intention to take mine higher, both for tight lanes as above and road handling, it's a v8 for a reason.

You have to be inventive with your flatdogs, I have mine semi ridgedly cable tied on and as above the panels cut away to the cable tie holes behind, plus with the right offset you'll eliminate a lot of rub, just those rear doors that are a bugger now but so handy for me as a camper vehicle i wouldn't want to 3 door it!

Cheers

Bit of a delay replying noisy... I'm with you on the lowness! I may trial some 1inch spring spacers and have a play with my arches as I'm only on a 2 inch lift at the moment! Always good to talk to someone thats been there and done it rather than doing everything trial and error!

 

[DaveM-sport]

I have 33x12.5 hankook dynapros on standard shafts and CVs and no troubles so far and I've abused them a fair bit.
Might be a different story when get it re-mapped again with the new turbo and I fit the lockers try my 36" Simex on for the ****s and giggles though


Your Disco looks awesome Noisey! Wouldn't mind those tyres next for mine

 

[Co-Pang-Yang]

Firstly, thread I started up to page 18 = awesome!!

Secondly sorry to interrupt but found these at work