AFO 723-Speedo works-up & down the box one last time.

Restoration projects and Austin related chat in here please
Fitz
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AFO 723-Speedo works-up & down the box one last time.

Post by Fitz »

Hi looking for the distance for the front spring bolt (of the rear Spring) to the shackle body mount on the body.
Essentially I managed to keep the front bolt hole as a reference but I lost the back mounts when i cut the floor out.
Promise to start some pics when I get 5 mins.
Rear ka brake conversion looks like it'll work when I have a 65mm hole cut in the backplates-will share info either way.

Thanks in advance.
Iain
Last edited by Fitz on Sun Jun 04, 2017 6:51 pm, edited 5 times in total.
Paulc
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Re: AFO 723 - distance centre of shackle hole & front mount

Post by Paulc »

Fitz, that link doesn't work
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Neil Evans
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Re: AFO 723 - distance centre of shackle hole & front mount

Post by Neil Evans »

I can measure it for you today but I'll be this evening before I get back to the laptop. Alternatively, phone me on the club's technical information helpline... :thumbs:
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Fitz
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Re: AFO 723 - distance centre of shackle hole & front mount

Post by Fitz »

Neil that would be great & hugely appreciated.
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Re: AFO 723 - distance centre of shackle hole & front mount

Post by Neil Evans »

35 inches, centre to centre... :thumbs:
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Fitz
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Re: AFO 723 - distance centre of shackle hole & front mount

Post by Fitz »

Thanks so much.
I've got a green flag at the moment for working on AF0.
If I can get out of the back of it this weekend I'll be over the moon.
northernboy
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Re: AFO 723 - distance centre of shackle hole & front mount

Post by northernboy »

Hello

I found this in the workshop manual - it helped me check all the measurements.


viewtopic.php?f=10&t=9092#p104419
My Fleet : Austin A35 (aka Dads funny old car), 2003 1.8 MGTF - (Dads cool car and Daily Driver), 1982 Mini Mayfair and the family Focus Hatch (aka 'The Skip')
Fitz
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Re: AFO 723 - rear brake woes.

Post by Fitz »

Thanks for the workshop manual measurements-that'll be extremely handy as this is the sort of info that I don't have.

A mixed weekend. Never got near the van till Saturday eve but as I am just making everything myself with an eye on strength I managed to drill out some tube to take my shackle bolts and fit into some 60x40 rhs 3mm wall. Also drilled into the rear bush & have angled the bleed nipple backwards.

Unfortunately I've messed up with the alignment of the rhs. I used two 25x25 angle with holes at 35inch centres mounted on the front mount & swung it up but it's out which is my silly fault for rushing.

Hopefully I'll get a good run at it this weekend.
Fitz
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Re: AFO 723 -rear brake woes.

Post by Fitz »

Image[/URL]
Fitz
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Re: AFO 723 -rear brake woes.

Post by Fitz »

Hmmm- I had the Ka backplates machined out to 65mm & with some gentle filing they slip over the axle nicely.
I then built up all the brakes, cut about 10mm off the edge of the A35 drum & all was well till I realised I hadn't any threads to screw the hub nut onto.

I've now been down endless dead ends trying to suss out a disc conversion. Sierra rear caliper are popular but expensive & prone to seizing in my experience so I looked into my favourite & unloved mondeo rear vented calipers (as I have a few) but drew a blank.

I thought mk4 escort might work as they have a large offset & although I didn't have a caliper to hand I thought no chance but now I'm considering taking the half shaft back to my parents as I know there's a caliper lying there (with life I've ended up with the van at my gf's mums, my parents & the location of my 'shed' in the shape of a triangle with each side about 80 miles ! ).

However what I'm now thinking about is offsetting the Ka backplate by 10mm.
I've looked at the Mot guidance & like everything it is a guide for interpretation but the rear brake performance will be off the scale compared to std.

Rear end welding is progressing but been waylaid by other issues of late frustratingly.
Fitz
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Re: AFO 723 -rear brake woes.

Post by Fitz »

At last ... stupid phone & photo bucket.

This is where we are ATM.

Edit-looks like this offsetting by 8-10mm clears everything.

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Neil Evans
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Re: AFO 723 -rear brake woes.

Post by Neil Evans »

Fitz wrote: but the rear brake performance will be off the scale compared to std...
Improve them over much, you'll risk them locking up under heavy braking and be pointing in the other direction before you know it... :whistle:
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Big Daddy
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Re: AFO 723 -rear brake woes.

Post by Big Daddy »

Neil Evans wrote:Improve them over much, you'll risk them locking up under heavy braking and be pointing in the other direction before you know it... :whistle:
and never attempt even moderate braking in a bend... :shock:
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Fitz
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Re: AFO 723 -rear brake woes.

Post by Fitz »

Yes I agree.

Plan is to balance them with load reducing valves, probably mk2/3 fiesta one's as I've used them in the past with good results and test on the brake rollers but I am keen to have good brakes.
Front will be discs but I'm not quite sure what to do there yet.
Big Daddy
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Re: AFO 723 -rear brake woes.

Post by Big Daddy »

Would advise getting F to R brake apportioning balanced across the whole operating range (all line pressures) rather than relying on a rear pressure limiting valve alone.

Otherwise car could become very unstable under braking on low mu surfaces (such as ice or even mud) unless you prefer going sideways without using the handbrake... :whistle:
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