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A7 & A10 Engine
A7 1946-1950
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The BSA A7-A10 Forum
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A7 1946-1950
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Long stroke rods
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Topic: Long stroke rods (Read 1080 times)
Drew Back
A's Good Friend
Join Date: Jun 2014
Posts: 172
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Long stroke rods
«
on:
23.03. 2015 20:07 »
Could I use a set of long stroke rods as well as crank in an early A10 motor since they had the same stroke??
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trevinoz
Newcastle, N.S.W. Australia.
Wise & Enlightened
Join Date: Jul 2006
Posts: 3226
Karma: 71
Re: Long stroke rods
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Reply #1 on:
23.03. 2015 20:27 »
Long stroke = 82mm, A10 = 84mm.
Different drive side main bearing diameter.
Crappy steel rods.
Why bother?
Having said that, you then get the problem of different rod length, if any, and piston pin height.
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Drew Back
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Join Date: Jun 2014
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Re: Long stroke rods
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Reply #2 on:
23.03. 2015 20:35 »
Woops my mistake I just realized the stroke was different, just trying to get parts together to build my next engine at least the crank would work..
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Drew Back
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Re: Long stroke rods
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Reply #3 on:
25.03. 2015 16:28 »
Just to be 100% the crank is totally diferent and will not work??
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muskrat
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Join Date: Jul 2009
Posts: 11032
Karma: 132
Lithgow NSW Oz
Re: Long stroke rods
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Reply #4 on:
25.03. 2015 19:30 »
It would take a lot of work (drive side journal and a mm off the barrels) and calculations (balance factor) to put a L/S crank in an A10 and with the shorter stroke you'd end up with an "A seven tenths". I'd rather spend the time, effort and $$ on a LJ crank & rods.
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
Drew Back
A's Good Friend
Join Date: Jun 2014
Posts: 172
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Re: Long stroke rods
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Reply #5 on:
25.03. 2015 22:28 »
Ok just makeing sure since im learning about this stuff now I have to be on the hunt for an A10 crank thank you
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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 1946-1950
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Long stroke rods