"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.