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A7 & A10 Engine
A7 1946-1950
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The BSA A7-A10 Forum
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Technical (Descriptive Topic Titles - Stay on Topic)
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A7 & A10 Engine
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Crank I.D.
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Topic: Crank I.D. (Read 435 times)
BritTwit
A's Good Friend
Join Date: Apr 2017
Posts: 113
Karma: 2
Crank I.D.
«
on:
28.02. 2020 19:16 »
I've had both of these for several years. They were both marked as A10. Now that I'm ready to use them, there appears to be a difference in the drive side.
What's what?
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muskrat
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Wise & Enlightened
Join Date: Jul 2009
Posts: 10754
Karma: 130
Lithgow NSW Oz
Re: Crank I.D.
«
Reply #1 on:
28.02. 2020 19:39 »
G'day BT.
The one on the left is either an A10 alternator model or an A50/65. Measure the drive side journal. I think the A50/65 is smaller.
Cheers
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'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7
BritTwit
A's Good Friend
Join Date: Apr 2017
Posts: 113
Karma: 2
Re: Crank I.D.
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Reply #2 on:
28.02. 2020 23:05 »
Thanks Muskrat
It appears I have an A50/A65 crank (smaller bearing I.D.) . I thought maybe the odd one was an alternator A10, but they are rare in the U.S.
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Nourish
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Join Date: Aug 2013
Posts: 124
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Re: Crank I.D.
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Reply #3 on:
29.02. 2020 09:31 »
Interesting - Will a unit crank fit into the pre unit cases - by just putting a bush over the smaller diameters?
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JulianS
1962 A10
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Join Date: Mar 2017
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Re: Crank I.D.
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Reply #4 on:
29.02. 2020 10:04 »
If it would I think some work would be needed.
The A65 gearside journal is a nominal 1.5 inch diameter and the A10 less at a nominal 1.375 inch diameter.
The A65 cranks early v late type have different widths, interesting article here;
https://www.classicbritishspares.com/blogs/news/early-vs-late-cranks
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Klaus
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Join Date: Jun 2015
Posts: 438
Karma: 10
Re: Crank I.D.
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Reply #5 on:
29.02. 2020 11:51 »
A65 has 10mm shorter strocke, so its better to build up an A7 with it.
chers Klaus
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BSA DB34 Goldstar, BSA A10 Road Rocked, BSA A7 Shooting Star, BSA M33, BSA M24, Kawa W650
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The BSA A7-A10 Forum
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Technical (Descriptive Topic Titles - Stay on Topic)
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A7 & A10 Engine
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Crank I.D.