Iowna Uass wrote:
> "Tegger" <invalid@invalid.inv> wrote in message
> news:Xns9CABCCEAA520tegger@208.90.168.18...
>> "tww1491" <twaugh5@cox.net> wrote in news:wGMDm.80$EU5.36@newsfe05.iad:
>>
>>> "Tegger" <invalid@invalid.inv> wrote in message
>>> news:Xns9CAAC6B33E6A8tegger@208.90.168.18...
>>>> "tww1491" <twaugh5@cox.net> wrote in
>>>> news:zBrDm.517$OY2.109@newsfe22.iad:
>>>>
>>>>
>>>>> Is it a duplex or single row chain. That can affect life.
>>>>
>>>>
>>>> It's a silent chain, not a single or duplex.
>>>
>>> Goes to prove I have not been keeping up with changes in automotive
>>> tech. Had to Google silent chain to find our what it is.
>>
>>
>> I did provide a Google link for that.
>>
>>
>>
>>> Certainly,
>>> seems to be an improvement over what used to be.
>>
>> It's a /considerable/ improvement. And combined with the new style of
>> tensioner system, means that chains are the wave of the future. And
>> believe
>> it or not, chains are cheaper for automakers to produce.
>>
>> The original problem with chains was the fact that they wore a lot over
>> time. Wear meant that they "stretched", which in turn retarded valve
>> timing, throwing emissions, mileage, and power off from what they should
>> have been.
>>
>> Belts were better for all the above, but their downfall was the need for
>> relatively frequent replacement. Hence the current move back to chains,
>> but
>> with new chain technology. Silent chains (AKA inverted-tooth chains) wear
>> at a fraction of the rate that the old beefed-up bicycle chains did.
>>
>>
>> --
>> Tegger
>>
>> The Unofficial Honda/Acura FAQ
>> www.tegger.com/hondafaq/
>
> Apparently the technology is not that new, one of the results in google is a
> scan of a page from Rankin Kennedy C.E. (1912). The Book of the Motor Car.
> Caxton.
>
> It took automakers almost a hundred years to make use of this type of chain?
> Bizzare....
>
> I am glad that honda put a silent chain in my CRV. It means many years of
> driving without having to crack open the timing chain cover to do some work.
>
>


Good reference here:

"Today's Silent Chains are actually an update of a 19th-century design."

http://chain-guide.com/applications/...oth-chain.html