On 9/7/2017 7:59 AM, Joerg wrote:
On 2017-09-06 17:25, Doug Landau wrote:
On Wednesday, September 6, 2017 at 1:29:59 PM UTC-7, Joerg wrote:
On 2017-08-28 15:59, AMuzi wrote:
On 8/28/2017 4:28 PM, wrote:
On Monday, August 28, 2017 at 1:59:20 PM UTC-7, Joerg wrote:
On 2017-08-28 13:43, sms wrote:
I replaced the chain that I broke on Saturday with one I
had in my garage that I must have purchased five to ten
years ago.

It has a connecting link and it says "Taya" on it. It's for
6,7,8 gearing. It seems okay, but I think that this is the
first time I've used a chain with a connecting link since
childhood. I looked up Taya and it's a big Taiwanese chain
manufacturer.


I still have a Sachs-Sedis 7-speed chain on my road bike
which I bought from a friend as NOS, for $6 which was the old
sticker price (the sticker had already turned brownish). No
link, mounted with hammer and anvil as usual. To my utter
amazement it doesn't show any measurable stretch after over
2000mi and sometimes I really put the coals on because of our
hills. Even the old Wippermann chains could not rival that. I
am very religious about chain cleaning and lube though.

The old 5-6-7 speed Sachs chains wore out three days after the
bike was junked.


The Sedis (later Sachs-Sedis) material and Delta hardening
process was not only exceptional but unsurpassed down to today
except for possibly Record chains. That ended with SRAM.


Why is that? In the automotive world such an advance in technology
is kept and further developed, not rescinded and chucked back into
the dust bin. Well, usually.

Simple - the motor runs quieter, and consumers buy it more readily.
Hence we saw plastic teeth on timing gears.


And they make that last 100,000mi before a PM swap. That's what it says
in my SUV's manual and when the old belts came out they still looked
like new.

The fact is that timing belts are actually more reliable than timing
chains on OHC and DOHC engines, as long as you follow the recommended
replacement interval. I recall when Saturn touted that they used a
chain, not a belt, and that the chain would last the life of the engine.
What actually happened was that the engine lasted the life of the chain,
and there were a lot of broken timing chains. Eventually they went back
to a timing belt, but it was too late for Saturn which had gained a
reputation of being unreliable and overpriced, and GM eventually shut
down that division without it ever having made a profit.

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