The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: wilko on 14.07. 2014 09:04

Title: bigend shells
Post by: wilko on 14.07. 2014 09:04

Has 60 thou undersize bigend shells ever been available for plunger engines? Can't find any anywhere?

Title: Re: bigend shells
Post by: Briz on 14.07. 2014 10:29

Dont think so. Taking .060" off an already skinny small-journal crank would be sailing close to the wind!

Title: Re: bigend shells
Post by: The Artful Bodger on 14.07. 2014 16:28

Biggest I could get in the UK were + 40 for the small journal, +60 are available for the big journal.
Colin

Title: Re: bigend shells
Post by: Resto-Rob on 14.07. 2014 19:15

Here you go, 0.60" bigend shells for your A10

http://www.vintage-motorcycle.com/index.php?language=en&site=4&pid=201&id=7078&suchtext=A10%20Big%20end&limit=0

Title: Re: bigend shells
Post by: muskrat on 14.07. 2014 21:01

Nice try Rob. They are for large journal which is the same for the A50/65.
I tend to agree with Briz. Might last with low comp and all other bits are in good nick.
Cheers

Title: Re: bigend shells
Post by: wilko on 15.07. 2014 00:20

Oh well. back to the drawing board. Even the spare crank has rusty journals and measures 1.450 in.

Title: Re: bigend shells
Post by: KiwiGF on 15.07. 2014 23:55

Some say the sj crank having a smaller sludge trap hole has more potential for over grinding than the relatively thin walled lj crank but I have no experience to back that theory up  *smile*

I've heard certain triumph con rods can be fitted to sj cranks and provide more regrinds so maybe you should keep this topic alive snd wait to see if anyone can post on this before givIng up?

My bikes big ends are newly ground to  -040 and I also have a spare crank already on '040 and needing a regrind so I interested to know if the spare is just a paper weight!