I once asked the lab to run a Noack test on what I seem to remember was a mix of 10% ZDDP & 90% Base Oil. Now if you heat up ZDDP enough, it will start to decompose of its own accord. It's only when ZDDP chemically breaks down under the influence of pressure & temperature (caused by metal-on-metal asperity contact) that it liberates the highly reactive sulphur-phosphorus species which react with metal to lay down the protective coatings which limit wear. The way I always understood things was that ZDDP on it's own doesn't actually 'do' anti-wear. ![]() I may start doing this for my engines from now on. ZDDP needs heat to work properly so it seems it would help get a protective film going before installing in the engine. ![]() It seems like a good way to get the anti-wear additives into the chain links. We tested this extensively because it's a race winning and endurance thing. Far less if any stretch for life of race engine. Bake in oven for 3 hours at 275 degrees, let cool, and install. Place new chain in a cake tray in oven covered in race oil. ![]() Here's what Henry taught me, and I've done it ever since to limit chain stretch which at best alters timing. I spent 12 months with Smokey Yunick in the states in 76 before going to the UK and Europe building endurance and very serious race engines. Not getting the tensioner thing cause no experience with them, but built 1000s of engines with chains. I welcome discussion on this, maybe even from Lake Speed Jr.
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