[Dragncar]

Originally Posted by mgarblik

Once again, I come back to the good, better, best scenario. There are roller timing sets I wouldn't put on a bicycle because I wouldn't want to injure my ankle when the chain snapped. On the other end of the spectrum we ran a STOCK out of the box Cloyes billet timing chain set with the "Z" chain, in the nitro funny car Boss Bird. No tricks, no extra oiling, no torrington bearing. No crank support, no harmonic balancer. 450 lbs. closed spring pressure, 1050 lbs. open pressure, 35 lbs. of boost through an ancient 1980's vintage roots SSI blower. 8000 RPM's typical, but reached 10,700 RPM's when transmission failed to shift once. All valvetrain components stayed where they belonged. We had a blower explosion once that stopped the engine and sheared off the camshaft key. I re-used the timing set on the next build. I would put Rollmaster timing sets in the slightly better category among the roller sets. Cloyes sets are so easily available, and reasonably priced, I don't know why people are always looking for something better. Cloyes even has a flat link set for Cliff! American company and they make the sprockets in USA. Full disclosure, (Chains are sourced from numerous world suppliers but made to Cloyes specs.) JWIS are the best chains along with Renold of France. Some other brands are using more and more Rolon branded chains. Made in India. Quality is marginal. I will not put a Chinese chain in anything I care about. FWIW

Slightly confusing item: The "Best" Rollmaster IWIS chian they offer is the same as the standard Cloyes IWIS roller chain. The "Z" series IWIS chain is proprietary to Cloyes. Essentially, additional heat treat and micro polishing. Cloyes has 100% verification of each timing set on their race stuff. Every set goes on a fixture and sprockets and chains are select fit for center to center distance and deflection.

The Cloyes .005 short chain I have does say JWIS on it. The Rollermaster .005 Red Series I bought from Butler you can not see any markings on the chain.
What would be nice is if Cloyes offered their best Z chain in ,005 short. And I have one of those too but for the life of me I can not find it but I remember it did not fit too bad even though it was std.
I have one of those Cloyes 3/4" wide link types sets. 30$ so I thought I would take a look at one. Its way looser than my Elgin/Morse chain set.