RAGTOP Posted January 28, 2017 Share Posted January 28, 2017 Hi, Has anyone ever upgraded/modified to a duplex chain system or cambelt,? Quote Link to comment Share on other sites More sharing options...
StagNL Posted January 29, 2017 Share Posted January 29, 2017 Someone in NZ who wildly modified his Stag has done so. It needed work done to the timing cover and cam covers to allow for the extra space needed. Duplex chain that is. Cam belt? Not that I know of. What is your reason for enquiry? Fed up with "german" chains that are chewing gum?Julian Quote Link to comment Share on other sites More sharing options...
Beans Posted January 29, 2017 Share Posted January 29, 2017 If that last remark is the case, a good quality (simplex) chain should outlast the engine, even on a Stag.Also after fitting the chains it is wise to check their tension for the first 1000 miles or so ...On my Sprint engine'd TR7 (so with duplex chain) just over 1000 km after fitting a new chain and the tensioner was already against its stop(the chain clearly wasn't pre-stretched as it should be).Adjusting everything solved it. Engine still going strong with the same chain, 20 years and well over 100.000 km on. Quote Link to comment Share on other sites More sharing options...
StagNL Posted January 29, 2017 Share Posted January 29, 2017 Indeed Theo, a good quality simplex chain is fine for a Stag V8.Some years ago a few of us Stag owners sought out which IWIS product number was the one for Stags. Eventually we found a type that was factory fitted to Mercedes 6 cylinder engines. The idea is that simplex IWIS chains were fitted to MB and BMW engines as a fit for life item. So that should also count for the Stag. After several chains that had "German" on the packaging but dubious marks on the chains themselves that had stretched within the Triumph factory parameters, I fitted the IWIS chains. Still going strong.There is a difference in price though. The County and "German" chains are twice the price of standard chains. IWIS double again. For such a critical item that otherwise has a bad reputation, I don't see the point in cutting costs. Quote Link to comment Share on other sites More sharing options...
andy thompson Posted January 30, 2017 Share Posted January 30, 2017 One of the Stag chains (the longer one?) is the same IWIS part number as a V8 Jaguar Quote Link to comment Share on other sites More sharing options...
Martins Stag Posted January 30, 2017 Share Posted January 30, 2017 So the IWIS chains I assume are Simplex but how is it they last so much longer? Do you need a longer life tensioner too? I like the idea of a fit and leave for 100,000 miles chains but is it really this simple as fitting IWIS chains? Also it appears that some "German" chains are not German but copies? (from China?) what are the recommendations as to what to look for when buying chains/tensioners for a Stag? Is there any modifications to steer clear off?thanksMartin Quote Link to comment Share on other sites More sharing options...
StagNL Posted January 30, 2017 Share Posted January 30, 2017 Longer chain is the one I bought. Just lopped one link off for the shorter one. Mine were a MB part but could easily be Jag too.Personally I will not fit anything other than IWIS chains. The "German" labelled ones sometimes come from County, but otherwise there is nothing on the chains or packaging that says where they are from. I just don't trust them anymore. Quote Link to comment Share on other sites More sharing options...
DJT Posted February 1, 2017 Share Posted February 1, 2017 http://www.ldparts.co.uk/shop/.....ac27a56860d6260ea912http://www.ldparts.co.uk/shop/.....ac27a56860d6260ea912 Quote Link to comment Share on other sites More sharing options...
mole42 Posted February 2, 2017 Share Posted February 2, 2017 What are known in the non-German world as IWIS but originally JWIS (pronounced IWIS) chains have the "JWIS" logo stamped on every link. Quote Link to comment Share on other sites More sharing options...
nibby Posted February 2, 2017 Share Posted February 2, 2017 Quoted from RAGTOP Hi, Has anyone ever upgraded/modified to a duplex chain system or cambelt,? Plenty of oil changes will prolong the life of the chains. Quote Link to comment Share on other sites More sharing options...
andy thompson Posted February 2, 2017 Share Posted February 2, 2017 IWIS chains have a beautiful polished finish on the links where they run on the guides and are simply the best quality chains I have ever seen. I also use them on my 6 cylindersI would not trust "'German" chains in a plastic bag - IWIS come in an obvious branded box Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted February 2, 2017 Share Posted February 2, 2017 Quoted from andy thompson IWIS chains have a beautiful polished finish on the links where they run on the guides This is the key - without this they just eat the guides / tensioner. Same on the 4 and 6sNick Quote Link to comment Share on other sites More sharing options...
Beans Posted February 23, 2017 Share Posted February 23, 2017 Quoted from mole42 ... chains have the "JWIS" logo stamped on every link ... Just checked my spare chains (TR7 & Sprint) which I bought many years ago and still in the box they indeed have "JWIS" stamped on the links Quote Link to comment Share on other sites More sharing options...
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