Single frame dimensions

Singles, twins and fours.
Pete.Silson
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Single frame dimensions

Postby Pete.Silson » Fri Apr 10, 2020 7:27 pm

The engine plate holes don't line up with my frame lugs so I think some fettling is in order. I found this diagram on the web but I am not clear on a couple of dimensions:
Ariel, Spring, Single and Twin, 1947-53 1a.jpg

1) What is this dimension A for a single? Is it the same as that for the twin?

2) Is this dimension B the vertical distance (as shown) or distance between the frame lugs?

Pete

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Re: Single frame dimensions

Postby Simon.Gardiner » Fri Apr 10, 2020 8:58 pm

That blue/black frame always struck me as a singles frame, Pete, I don't remember the front tube and lower rails being close enough together to be a twin. (I could be wrong though, and the fact that it originally had a G107 g/box doesn't help as the KH had one as well as the singles according to Drags info).

SG
'55 Huntmaster, '56 VH, ' 51 VH, '80 R100RT, '00 Sprint ST (but all those Ariel parts can only make one running bike...)

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paul.jameson
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Re: Single frame dimensions

Postby paul.jameson » Fri Apr 10, 2020 9:20 pm

The single frame has a cast lug at the bottom of the front down tube. The KH frame hasn't.
Paul Jameson
36 4G, 37 VH, 54 KH(A), 75 Healey 1000/4, 52/53 ex ISDT KHA (project).
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Pete.Silson
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Re: Single frame dimensions

Postby Pete.Silson » Fri Apr 10, 2020 10:53 pm

Paul

I'm pretty sure it's a single frame. The problem is that the distance between the front lugs is too big not too small - a tad over 9" (8-9/16 in the diagram). In addition the horizonal distance between the top front and top rear lugs is about 15-1/2" (15-1/32 in the diagram). I was hoping that, if someone knew the dimension A, I could get the top "triangle" set first and then finally tweak the front lower tubes up if necessary.

Pete

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Re: Single frame dimensions

Postby john.whiting » Sat Apr 11, 2020 2:00 am

Its quite obious the frame is slightly sprung......its quite flexible ,and somewhat easily bent when the plates arent bolted in ......simply spring it back to catch the holes .....havent you got a podger bar.....standard in steel erection to align boltholes .

Pete.Silson
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Re: Single frame dimensions

Postby Pete.Silson » Sat Apr 11, 2020 5:10 pm

I've got a podger bar however the offset is bit more than I would be happy with just podging into place.
offset.jpg

I am going to set up a jig to pull it a bit closer into line.

Pete

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Re: Single frame dimensions

Postby Mick D » Sat Apr 11, 2020 5:39 pm

Hi

A ratchet strap would probably ease that into line whilst you fit the stud.

Regards Mick

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Re: Single frame dimensions

Postby john.whiting » Sun Apr 12, 2020 11:58 am

Thats nothing ...I reckon hand pressure would line the holes up.

Pete.Silson
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Re: Single frame dimensions

Postby Pete.Silson » Sun Apr 12, 2020 7:55 pm

Thats nothing ...I reckon hand pressure would line the holes up.

John - You forget that you are talking to a pommie wimp here.

I ended up using a threaded puller between the top sidecar lug and the engine plates with a load cell in it. It took just over 70 kgf to pull the holes into alignment and a further 45 kgf to put a permanent set into it. I was quite chuffed with the final result...
post-tweaking.jpg


Pete

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Re: Single frame dimensions

Postby JohnnyBeckett » Sun Apr 12, 2020 8:55 pm

HI that is good now you can get on and rebuilding it good luck :)


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