tech question regarding custom brake/rotor setup

[nizm0zed]

Ok smart people, i need some advice...

 

I am currently fitting some XF falcon front rotors onto the front struts of my slow project.

The Falcon rotor will accept the Datsun wheel bearings (the outside diameter of each bearing is the same)

however, the spacing between the inner and outer bearing is slightly different, the Datsun having a slightly wider spacing by about 4mm

With the whole rotor centralised on the inner wheel bearing, the outer bearing falls short of being able to locate into its outer race buy about 4mm (DOH!)

I can fit the Falcon outer bearing, however its internal diameter is larger than the Datsun stub diameter, being bigger means it will go further onto the stub axle, however its loose, very loose.

 

My dilemma.

Do i space the inner wheel bearing outwards with a machined spacer placed behind it? (between the bearing and the base of the stub)

Or do i get a small sleeve machined up to increase the diameter of the stub where the outer bearing sits?

Im thinking the sleeve is the better solution as the further the bearings sit out from the base of the stub, the higher the leverage forces acting through the bearing.

The sleeve would be about 2mm thick.

[zed240au]

other option would be to go to bearing supplier and get a bearing with the outer size u want to fit falcon hub and innner size to match datsun stub axle

 

mick

[luvemfast]

Oh

Is it a bearing inner and outer race issue?

Kind of thought it was the width of the hub?

Get the right bearings then.

[nizm0zed]

excuse my crappy drawing, i'll try and explain it better...

 

See the outer bearing in blue, it doesnt sit fully into the rotor because it hits against the taper of the stub axle.

The Falcon bearing has a larger inside diameter, so it fits over the taper to some degree.

I was thinking that if i put a spacer on the stub axle, underneath where the outer bearing would sit, i can then use the falcon bearing and it'll sit closer in to the rotor.

[nizm0zed]

see the spacer sleeve in red, sitting over the stub axle, to take the falcon bearing with the increased inner diameter, which then allows it to sit further in.

 

Is this incredibly dodgy?

 

If its not done this way, the only other options i see is to machine the hub so the bearing will sit in further, i dont know if thats such a smart idea in itself, let alone getting a complete strut to sit in a lathe...

Or the other option is to place a spacer behind the inside bearing, pushing the whole rotor, bearings ect outwards by about 4mm.

again, not so keen on that, but is that less dodgy?

[zed240au]

Id go with machining a spacer an putting it on shaft if your need is to move bearing in to match hub I wouldnt be keen on moving hub out as per your second option

Was sure i was told one of the falcon hubs was straight fit just needed change of bearings pretty sure it was xa to xc falcon but ive never got to try the fit

 

mick

[nizm0zed]

yea, i think from memory the XA-XB and some of the XC had a smaller bearing inside the same rotor as the later models?

However, i allready have some rotors for a cheap price (a new pair is almost $200) so im trying to use what i have.

 

Well, im going to get the spacer machined up for the outer bearing, then when the wheel shears off at mach 3 i can blame mick for saying it was a good idea 

 

It also looks like it'll work perfectly with the wider hilux caliper.

Pictures will follow, eventually....

[zed240au]

Didnt you read the fine print disclosure at bottom of my reply all care no responsiblity Lol

I ve been using hilux calipers on xy,xa type discs for years now work I was happy to stay with datsun hubs just machined outside of hubs down to suit inside of discs That way when i kill set of discs just slip new set discs on drill mount holes and away i go again

 

good luck with fitting the hubs

 

Mick