duplex and simplex

fett said:

see the thing is my bmw has got "duplex double row chains" so why would they say it twice if you get what I mean?

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Because most people dont know the difference between simplex and duplex.
And they are Germans.

Duplex is a type of stainless steel.

But in this case it's one row of chain or two rows of chain.

I know a bit about duplex stainless steel, one of the uses is to make the boxes that radioactive sh!t is stored. Radiation is my specialist subject

Pretty sure they don't make chains out of it, is bloody expensive and a pain in the arse to work with.

Radioactive Man said:

Duplex is a type of stainless steel.

But in this case it's one row of chain or two rows of chain.

I know a bit about duplex stainless steel, one of the uses is to make the boxes that radioactive sh!t is stored. Radiation is my specialist subject

Pretty sure they don't make chains out of it, is bloody expensive and a pain in the arse to work with.

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We supply stainless lifting chain to the nuclear industry, so they definitely make it

I think that in the case of the steel, some manufacturers just adopted the term 'duplex' as a brand name for a particular product with high chrome and molybdenum content (i.e. "double" the chrome, but it's usually a bit less than double). It doesn't necessarily mean that a double or 'duplex' chain will be made of it. They probably aren't, becase they go rusty if you leave them outdoors, so mostly they're not stainless at all.

Brown said:

I think that in the case of the steel, some manufacturers just adopted the term 'duplex' as a brand name for a particular product with high chrome and molybdenum content (i.e. "double" the chrome, but it's usually a bit less than double). It doesn't necessarily mean that a double or 'duplex' chain will be made of it. They probably aren't, becase they go rusty if you leave them outdoors, so mostly they're not stainless at all.

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seems a good answer..

Duplex chains are older then "some" of the LZ contributors on here.
fer example, early BMC engines used them in B series engines, & some bigger A series engines from the later 1950`s.
yes, leave them in the rain, they will go rusty!!
Duplex over Simplex is not hard is it, where longer lasting engine componants were designed in to its manufacture from the 1950`s that I know of,
where as year for year at the time, low output fords & others only used single row chains for engine valve timing chains due to simplicity and low cost production price.
OK, then ford block based Cortina Lotus engines ?
high power ? single or Duplex chains /
LOL...
I know, but do you

Names for the same product often change from various companies due to copyright laws.
A timing chain is a timing chain is a timing chain FFS!

I am sparticus.

post #4

and i'm Sparticus....and so is my wife

yer both ferkin sparkerlers

Yup, we had duplex chain in my mother's old Morris Oxford. Then when I was a bit older we had a Wolesley Six with more cylinders but a single chain. I built the remains of the engine into a wall at my parents old house. The cylinder head made a really good cornerstone and the diff ended up as a finial on an arch over the garden gate. I think I've got a duplex on the TD5 but I haven't needed to get it out yet fortunately.

i used to work for "simplex" when it was part of the gec group....we made milking machines, grain storage silos and similar stuff.

in the wider sense simplex, duplex,triplex are just words that mean the same as single, double and triple

hence a bike chain with one row of rollers is referred to as a simplex chain....one with three rows of rollers side by side is a triplex chain....the metal its made of dont come into it

ricc said:

i used to work for "simplex" when it was part of the gec group....we made milking machines, grain storage silos and similar stuff.

in the wider sense simplex, duplex,triplex are just words that mean the same as single, double and triple

hence a bike chain with one row of rollers is referred to as a simplex chain....one with three rows of rollers side by side is a triplex chain....the metal its made of dont come into it

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post #4

Brown said:

Yup, we had duplex chain in my mother's old Morris Oxford. Then when I was a bit older we had a Wolesley Six with more cylinders but a single chain. I built the remains of the engine into a wall at my parents old house. The cylinder head made a really good cornerstone and the diff ended up as a finial on an arch over the garden gate. I think I've got a duplex on the TD5 but I haven't needed to get it out yet fortunately.

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Looking at the piccies in the TD5 engine overhaul section of Rave, it looks like there are two chains:
Camshaft drive timing chain is duplex (two rows of rollers)
The oil pump drive chain is simplex.

Single roller is Simplex.

Double rollers are Duplex, easily explained as two simplex chains side by side, and sharing a common centre link.

and would you believe that triple rollers are known as Triplex, and work on the same principle as duplex, but with another row of rollers and links.

Don't go eye-rolling at me, young man!

Someone's got to explain!

not at you, just in general

No fences taken!

or gateposts

Not even a steak ...

i's hungry now