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Re: My A70 [Re: Ray Elliott] #757310
11/27/18 4:19 pm
11/27/18 4:19 pm
Joined: May 2013
Posts: 5,560
West Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member

Joined: May 2013
Posts: 5,560
West Yorkshire
Some A65's had the same cutaways on the flywheel so I would say yes, providing it fits on the crank, it can be machined.

I'd be interested to see your photos of the A10 crank conversion, Im going to fit an A10 crank to one of the A65 motors (79mm pistons for 830cc) I'd like to see how you worked around being able to fit the alternator, Im also looking at using another Bob Newby Belt drive (which in turn pushes the alternator outboard a little)


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Re: My A70 [Re: Ray Elliott] #757404
11/28/18 11:42 am
11/28/18 11:42 am
Joined: Aug 2013
Posts: 52
England
Servodyne Offline
BritBike Forum member
Servodyne  Offline
BritBike Forum member

Joined: Aug 2013
Posts: 52
England
The late A65 flywheel cutaways or 40mm whereas the A70 is guesstimated at around 33mm looking at various pictures I've seen of them. My A10 flywheel was slimmed down to 35mm to get me in the right ball park when I had the crank balanced at SRM. They 'only' drilled two holes in it so it couldn't have been far out.
My latest problem with fitting a late A65 flywheel to an A70 crank is that the A65 ID is around 122mm and the A70 OD is around 131mm. I don't really want to start machining only to make it unusable for both cranks. I would imagine the relief on the flywheel to allow it to slip over the big ends will require deepening as well.

Cutting the annulus groove on the bearing sleeve required a bit of lateral thinking as my local machine shops wouldn't do it. I simply attached two jubilee clamps leaving the desired gap in the correct position and rotated it slowly while attacking it with a high speed disc cutter with two discs fitted in stead of one. I then punched through the wall of the sleeve using a carbide burr.

I'll post some photos of the A10/A70 crank conversion is a new thread


1957 BSA A10 Spitfire
1971 BSA A65 Firebird
1971 BSA A70 Lightning
1975 Norton Commando
1961 Norton 99
Re: My A70 [Re: Ray Elliott] #757433
11/28/18 5:10 pm
11/28/18 5:10 pm
Joined: Jan 2004
Posts: 4,075
ca, us
D
DMadigan Offline
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DMadigan  Offline
BritBike Forum member
D

Joined: Jan 2004
Posts: 4,075
ca, us
A body grinder in the tool post works well also. I used it to cut a needle bearing inner sleeve to size. Handy for removing the chrome from discs, especially ones with holes in them.
EDM works very well for drilling holes in hardened steel.

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Moderated by  Allan Gill, Jon W. Whitley 

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