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MG Midget and Sprite Technical - Spitfire Disc Machining

Does anyone know the measurements required for machining the disc when adapting Spitfire discs for the midget. The caliper used will be the MGB type.
Motley 5

Im assuming you mean the adaptor between the hub and the brwke disc


Not off hand... BUT there are several and even mentions and a detailed CAD of all 3 sides in the arcives... (sorry) you will have to play with various search wording like huff and adaptor, ect...its been between 4 to 10 years ago it was posted (2012 -2006) in that area

i dont recall much more then that

try the library section on the mg experiance website ... they may have some referances there


But there not to expensive cinsidering time and materials on the midget mania website in the usa or mini spares in the uk

In the usa mania there constantly offering deals so dont be afraid to ask for a special offer
prop

No Prop, Mr/Mrs Motley means the disc. Which is why it says "machining the disc"

I think I have some somewhere. I can try and find them and measure them if you like?


Rob Armstrong

Im a bit confused

Are we talking about the spridget hub using a the spitfire disc brake and the mgb caliper ?

Prop
prop

Yes Prop, that's the kit.

the kit uses the Spridget hub, an adaptor (the hub adaptor) and a Spitfire disc, which has to be machined to fit. MGB calipers too.

We're talking about the same kit, as far as I can recall the discs need an edge taking off them to clear something

Rob Armstrong

This thread should help:

http://www.mg-cars.net/mg-midget-sprite-technical-bbs/spitfire-diskmgb-caliper-conversion-info-needed-2011030711152325894.htm

Jim
J Smith

I dont think the disc needs turning... at least im not aware of it... i have the kit... but no mention of shaving the spitfire disc... supposed to be direct fit

i have the huff adapter from mini mania...

prop
prop

I read a book once that said the peter may kit has the spitfire disks specially machined and that standard ones don't fit.....
Andy Phillips (frankenfrog)

Thanks for the replies.
From what I can gather, the two areas to address are the diameter and clearance with the outboard caliper casting. The Spitfire disc is 232mm and needs to be reduced to 229mm, while the caliper clearance can be achieved with slight adjustment to casting and the radius on the disc body. However, if a 4 pot were used, eg Hi-spec, only the disc diameter would require machining.
The price from PM and Frontline for a pair of modified discs is over £80 + vat, while a pair of Spitfire discs can be purchased for less than £30 inclusive.
Cheers
Master Motley age 13(?)
Motley 5

where are you in the UK Master Motley? I think I've read the same book Andy has ;)
Rob Armstrong

Wow... omg you were right

old age sucks... i did not remember this... im so glad this was brought up... ill make a note to myself about this and stick it into my kit

thanks

prop

this link has all the mods needed to make everything fit togather as needed



http://www.spridgetmania.com/Big_brake_adapters_for_Spridgets__HUF175
prop

I have bought standard discs and found they didn't fit correctly and so bought discs direct from Peter May which did.
Daniel Stapleton

Hi Guys,
Rob. South of you in East Anglia. Did you managed to dig out the dimensions?
I too have read a book, which renders one reply most supportive!
Motley 5

This thread was discussed between 19/05/2016 and 23/05/2016

MG Midget and Sprite Technical index

This thread is from the archive. The Live MG Midget and Sprite Technical BBS is active now.