Timing chain

[2cams70]

I just posted the article as it provided some concise information around the advantages of solid roller chains. Plenty of other web sites provide similar information

When they are talking about solid rollers they are mostly talking about the Bush chains previously mentioned. These are low speed high load industrial chains. The timing chain used in an engine is high speed and the rollers need to rotate on their axis unlike a Bush chain.

[rgh0]

I think you are confusing "Bush" chains that have no roller just a larger diamter pin connecting the links with "Roller" chains. Yes they are typically used in lower speed heavy duty industrial drives.

"Roller" chains use a roller around a smaller diameter pin and are typically used in higher speed and lighter duty drives such as industrial timing chains.

The discussion here is not about "Bush" versus "Roller" chains but about the use of solid pins and solid rollers versus split pins and split rollers on "Roller" chains.

cheers
Rohan

[2cams70]

I think you are confusing "Bush" chains that have no roller just a larger diamter pin connecting the links with "Roller" chains. Yes they are typically used in lower speed heavy duty industrial drives.

"Roller" chains use a roller around a smaller diameter pin and are typically used in higher speed and lighter duty drives such as industrial timing chains.

The discussion here is not about "Bush" versus "Roller" chains but about the use of solid pins and solid rollers versus split pins and split rollers on "Roller" chains.

cheers
Rohan

No I'm not confused Rohan. Yes a Bush chain is where the roller does not rotate. The point I am making is that most if not all of that very reliable information (especially from Chinese/Taiwanese manufacturers) being sourced from the internet concerns split versus solid "rollers" on Bush chains not split versus solid rollers on roller chains. On a roller chain it's the pin the roller rolls around that takes the chain tension load and not the roller itself. The roller just rolls around as a bearing in other words.

[rgh0]

I will let others decide what to think and what chains to buy. I think we have exhausted this topic as is not uncommon when we try to discuss engineering details

[2cams70]

Yes I agree it’s finished. For me at least I wouldn’t hesitate about putting a split roller chain in my engine provided it was of reputable manufacture.

[alanr]

I am thankfully not in the market for a timing chain at the moment but I would not be happy building an engine currently to then fit a split roller timing chain.There is to my mind just too much at stake to risk when having spent substantial time, effort and money building an engine without further knowledge of these split roller chains.They may be ok, they may be not. Who knows at the current time?
Personally with the knowledge of this thread when I do need one I will be looking for an alternative brand of chain.

Do Renold still make a continuous timing chain suitable for a twincam I wonder and if so who can supply?

Alan

[HCA]

Reply from the IWIS distributer this morning - he is certainly intent in sending me down the split roller route


Yes I stock the bush chain, but really don’t think you need to go down that road, and if you do, you may have other issues with the size of it, (rubbing)
Perhaps best to get advice from QED as they are the experts with that engine.

Regards,
Jeremy.

[alanr]

Hal,
I see Mountune describe their Twincam Timing chains as being a 'Heavy Duty' motorsport chain.
https://mountuneusa.com/products/heavy- ... s-twin-cam

Perhaps a conversation email with them on their chain could be an option for you?

Alan.

[2cams70]

Let’s not get confused here. I too would prefer a chain that was not split link - i.e not an endless chain. Split rollers are a separate issue. You couldn’t use a Bush chain in a twin cam. Disaster! way too much internal friction. Twin Cam steam engine maybe but not a Lotus Twin Cam.

[alanr]

i don't think anyone is confused at all.
All the conversation has been about split roller and not about split link which is a different subject altogether.

Alan.

[HCA]

And here is the reply from Cross and Morse...

Good morning Hal,
I hope this email finds you well,
I'm afraid we have stopped making these chains some time ago.
Sorry we cannot be of much help.

Kind Regards,
Jonathan Vargas
Export Sales
Cross+Morse
Tel: +44 (0)121 360 0155

[promotor]

And here is the reply from Cross and Morse...

Good morning Hal,
I hope this email finds you well,
I'm afraid we have stopped making these chains some time ago.
Sorry we cannot be of much help.

Kind Regards,
Jonathan Vargas
Export Sales
Cross+Morse
Tel: +44 (0)121 360 0155

I'm surprised at that - I think I bought one last year. Be interesting to know why they stopped.

Are they referring to the 122 link chain or the 120 link, or both?

[HCA]

I only asked for a 122 link..,

[rgh0]

Just for information this is the page from the IWIS catalog.of the relevant chain specification JWIS G67, ISO British Standard Chain 06 B-1. This chain has solid rollers according to the catalogue. I can find no reference to a split roller chain to this dimensional specification in the catalogue

JWIS ISO 606 British standard chain.pdf

(331.19 KiB) Downloaded 111 times

The Reynold catalogue shows they have solid roller chains to the same specification.

cheers
Rohan

[2cams70]

There’s no mention in the catalogue whether they are solid rollers or not. You’d have to ask. Chances are if you bought such a chain you’d have to join it with a split link. Given the choice between a split link and a split roller I know which I’d prefer.