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Thread: Fully floating axle

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    Spanner Monkey glenn22481's Avatar

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    Fully floating axle

    Iv'e got about 250bhp going into my escort I am building for rallying and will soon be after an axle and need some advice on what kind I need . Is a f/floater really worth the cash or will I be ok with a semi floating quaiffe jobby? I heard they need a bit of reinforcing to stop them falling to bits and they tend to leak from the diff casing, anyone know diffrent ?
    Im in the channel islands and have limited resources so if anyone has any good respectable contacts on who can supply and build what I need then let me know .

    Cheers all..............

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    Way too much free time Decade Plus User Retromotorsport's Avatar
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    Re: Fully floating axle

    Put a standard Atlas under there, and get out and rally it. In a year or so you may find that it leaks but by then you'll have saved up for a full works one (if needed) These can be obtained from gartrac at around 4k. Like I said put a standard one under there. You could use a brace, gartrac sell these for a lot less than 4k or contact darren on here he may have one for 50 or so. Dont even think of using an English type. It will break.

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    Pit Crew Decade Plus User GavinR's Avatar
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    Re: Fully floating axle

    Got to be an Atlas with that much power
    Depending on your budget, as Retro says, try a standard 2.8 Capri axle with a dural brace (~ 100 new), if the shafts break, fit a semi-floating Quaife kit with Gp4 shafts and big side gears ~ 600, easy bolt on conversion. That's what I use on my 240bhp rally car (see below), haven't touched it for the last 6 years

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    Racer Decade Plus User Sideways's Avatar

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    Re: Fully floating axle

    From experience your gonna a break std atlas half shafts with 240bhp on a rally car due to the amount of stick they get, been there done that with less horsepower

    The cheapest way is to keep the std casing, and change the side gears in the diff to enable you to fit h/d Gp4 splined shafts with the std bearings(also a weak point) and diff flange, these are made by Quaife and known as Gp1 shafts

    the next stage up is the quaife big bearing kit, which is also known as a semi-floating kit as the bearing and flange/wheel studs stays on the axle when the shaft is removed. I use this kit and never had any problems apart from getting the hubs to stop leaking diff oil as they have a crappy oil seal/'o' ring set-up and the oil travels up the shaft and out past the 'o'ring and flange onto the wheel

    the downside of these two kits is you can't use fixed calipers as you still get a small amount of play in the bearings which will cause pad 'knock off'

    If you want to use fixed 2 or 4 pot calipers as opposed to the sierra/xr3 single piston sliding calipers then you will need to go to the fully floating twin taper bearing axle/and hubs etc which eliminates all side play as it used twin taper bearings on each side(similar to a front wheel hub). This is the dogs bollocks of axles but unfortunately comes at a big cost.

    Simon aka GP4 did a excellent write up on diffs and axles somewhere on this forum

    Steve

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    Racer Decade Plus User Sideways's Avatar

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    Re: Fully floating axle

    found Simon's excellent write up

    here

    Cheers
    Steve

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    Spanner Monkey glenn22481's Avatar

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    Re: Fully floating axle

    Cheers chaps for the info, but due to my pc being a pile of i cant view the info on the page, could one of you guys copy and paste it here on the forum ...
    As for what 'Sideways' said about brakes on the s/floater from quaiffe, what do you mean 'fixed' calipers and 'knock off ' ? I know a few guys who race escorts who use disks on the rear and report no problems so what are they using???

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    Racer Decade Plus User 900ss's Avatar

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    Re: Fully floating axle

    Stupid Q but why do the std atlas shafts snap?
    Is it cos of the twisting forces or just because the cars take such a pounding over the rough stuff?
    Btw, wheres the most likely place fore the std shaft to snap? Before or after the bearing?
    Just preparing myself

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    Spanner Monkey glenn22481's Avatar

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    Re: Fully floating axle

    Answer the quetion then if you know the answer Mr 900ss...

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    Racer Decade Plus User Sideways's Avatar

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    Re: Fully floating axle

    Yes Wyn, its mainly because of the pounding they get, constantly on and off the throttle and hard landings whilst the wheel is spinning. Also depends upon how hard you are on your car with the right foot . Mine have always broke at the diff end just after the splines, but since i have put the Gp4 shafts in I have never broke one, touch wood

    Glen, the link I posted was to another page on this forum in the old skool tech archives titled "which axles for what" or similar

    When I say 'fixed' caliper I mean the caliper is solidly fixed to the alxle and has at least 1 piston either side (like a rwd escort front caliper) and does not slide unlike the single piston sliding calipers found on xr3's and many new cars these days

    with single bearings on the half shafts there is a small amount of float or sideways play when using rear discs, what happens when this occurs is the disc pushes the pistons back into the calipers slightly, and the next time the brakes are applied you have to take all the play up which means excess travel in the pedal and this is called "pad knock off"

    with a fully floater, all the play is eliminated due to using twin taper bearings and you can use 'fixed' twin pot calipers like the works cars set ups.

    Cheers
    Steve

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    Way too much free time Decade Plus User Retromotorsport's Avatar
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    Re: Fully floating axle

    Steve, you dont have to worry about yumps anymore, you've tasted the tarmac, the wide open tarmac, no trees, no bridges built for a horse and cart taken flat in 5th, I am refering to your post about 'brunters' think you said "sod the rally's I like this track stuff", and thanks for explaing 'knock off' ,far to much typing for me

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    Spanner Monkey Scot's Avatar

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    Re: Fully floating axle

    Steve, I've got the same damn oil seal problem with fully floating set up. I've tried upteen new oil seals to no avail. Thing is it's only on the one side, the otherside is exactly the same but works perfectly??

    I now convinced that the halfshft is actually worn at the point of contact of the oil seal, but surely a bit of rubber wouldn't wear it down, would it? Or is this a sign of twisting in the shaft?

    Have you found a fix for yours yet?

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    Re: Fully floating axle

    Sorry to drag up an old thread but does anyone have a cure for leaking semi floating hubs?

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