Re: [alfa] single row timing chains

["Gwynne W. Spencer" <gwynnes1@xxxxxxxxxxx>]

I do not know diddly about  chain specs, but when BMW changed their V8 from 
4 liter to 4.4 in 1996/97, they switched to a single row chain (this drives 
DOHC head in each bank and later versions also have variable valve timing. 
This was ostensibly to reduce friction and increase CAFE.

Gwynne Spencer ('93 Spider Veloce, '97 BMW 540i [4.4 ltr V8])

At 09:50 AM 11/7/2004 -0700, you wrote:
>At 10:12 AM 11/7/04, Randy & Marge Barnhart wrote:
> >anyone know of a source for single row timing chains for 4 cyl 2000, or 
> how to
> >remove 1 row from stock chain, and if so what do you use for the master 
> link?
>
>Absolutely NO way that you're going to narrow a double chain to single and
>get a usable item.
>
>The later cars use '3DR' type chain. Does the 2000 use '3SR' ??
>
>Used to be Reynold (Brit) made both 3DR and 3SR. An even (MUCH !!!) better
>alternative was Jwis (a Benz captive of sorts)-- theirs was considerably
>heftier than the industry standard, and was a 'drop-in' replacement for
>3DR/3SR.
>
>I don't recall whether any Merc's used the Jwis 3SR equivalent. I think
>some chain drive cam Datsuns used 3SR as well. There were also some Asian
>made 3SR and 3DR chains available, but, at least back in the day, they
>might as well have been made out of used Tootsie Rolls !!
>
>I have no idea what corporate matings or name changes may have taken place
>since I was up to date on this stuff.
>
>You are generally going to be MUCH safer and more durable if you buy the
>tool (generally available from an industrial roller chain distributor) for
>assembling and dis-assembling pin links on the specific type of chain, and
>use NO master link at all !!
>
>I would suggest some googling on 'Reynold', 'Jwis', and '3SR chain' (IF
>that's what the 2000 uses).
>
>The 3DR and 3SR chain standard dimensions are a 'British Standard' sort of
>a thing, not American or continental European.
>
>Greg (was a product development engineer for Morse Chain in the '60's)
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