Re: Annealing copper

["Britcars.com" <Lawrie@britcars.com>]

Thanks for explaining the "colored smoke" that I saw, Lew (and thank you, 
Bob, for your reply to my note).

One point that neither of you addressed (if I may be so bold as to 
criticize!) is whether, in fact, I really need to anneal my external pipes. 
How likely are they to crack if I don't do anything to them? Will polishing 
them by hand really aggravate the problem and make them subject to failure? 
Part of me would like to ignore Mike Allison's warning (after all, he is 
adamant that PA engines should be red, not green!) but another part of me is 
worried that I could suffer a major engine let-down if I use the pipes as 
they are and then have one break while I'm out driving ...

TIA,

Lawrie
----- Original Message ----- 
From: "Lew Palmer" <lpalmer@roundaboutmanor.com>
To: "'J.E.A. Rich'" <mmmbob@adelphia.net>; "'lawrie'" <lawrie@britcars.com>
Cc: <mg-mmm@autox.team.net>
Sent: Thursday, August 24, 2006 5:00 PM
Subject: RE: Annealing copper


> And the fumes seen coming off the pipe when annealing is likely to be oil
> being burned off the inside which was embedded in the copper. I agree with
> Bob that annealing to even a cherry red will not melt the silver solder 
> (?).
>
> Cheers,
> Lew Palmer
>
> -----Original Message-----
> From: owner-mg-mmm@autox.team.net [mailto:owner-mg-mmm@autox.team.net] On
> Behalf Of J.E.A. Rich
> Sent: Thursday, August 24, 2006 2:41 PM
> To: lawrie
> Cc: mg-mmm@autox.team.net
> Subject: Re: Annealing copper
>
> Lawrie,
>
> Many years ago, before people like Barry Foster started making
> replacement pipes for MMM cars, I decided to make some myself. All I
> had to do was unsolder the end fittings and replace the copper pipe -
> right ? Wrong !!  I have no idea what was used to attach the fittings
> to the pipes but it was not silver solder or ordinary braze, it was
> something with a much higher melting point. I ended up sawing the end
> fittings off, drilling the copper out of the fitting and brazing new
> pipes on.
>
> Heating your pipes to cherry red to anneal them is NOT going to
> loosen the end fittings if the factory put them on !
>
> Cheers, "Bob".
>
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