The BSA A7-A10 Forum

Technical => A7 & A10 Engine => Topic started by: iansoady on 10.09. 2011 16:40

Title: Which camshaft & crank do I have?
Post by: iansoady on 10.09. 2011 16:40
I have the head & barrel off my 1961 Golden Flash as I have a couple of fins to weld and my dodgy knee precludes riding at the moment *sad2*

I know this engine should have the later (big journal?) crank and sports (356?) cam but am not sure what I actually have. I know I do have thin flange barrels which isn't right.....

Just to satisfy my idle curiosity, how can I tell which crank & camshaft I have without further dismantling?
Title: Re: Which camshaft & crank do I have?
Post by: bsa-bill on 10.09. 2011 17:32
I'd be interested to know how you can identify them without a partial strip down.
Not too big a job to lift head and barrels and peer down onto the crank though.
For the cam, if someone could measure the lift on the cams, you could mark a pushrod and determine it's travel. I have a 356 cam spare I'll see what I can do tomorrow
Title: Re: Which camshaft & crank do I have?
Post by: RichardL on 10.09. 2011 22:11
Cam profiles available somewhere here as a graph. 

As for the crank,  maybe best to satisfy your curiosity when the need comes to get in there.  To my recollection there is no view to the journals through the sump plate,  but maybe someone will know if one could ID the crank from any markings or details on the outside of the flywheel.

Richard L.
Title: Re: Which camshaft & crank do I have?
Post by: KiwiGF on 11.09. 2011 02:17
I think the LJ crank flywheel has bolts on the circumference ie radially and SJ are bolted axially ie inside the flywheel difficult to describe in words

Heres an LJ

http://www.trademe.co.nz/Browse/Listing.aspx?id=406267353

No doubt someone will correct me if I've got that wrong

Title: Re: Which camshaft & crank do I have?
Post by: terryk on 11.09. 2011 09:12
yeh thats right KiwiGF