249
« on: April 09, 2019, 08:14:27 AM »
While not having to do with camshaft life, I believe this story will interest some of you. Back in the 80's I had a conversation with Bobby Allison who was in Michigan for the race at MIS. He would fly his plane north and do some short track races before MIS. He said he visited a man in Wisconsin who built Buick V6 nascar engines. The story goes that he tried Mobil 1 on the dyno and noticed that the oil temp. had gone down while testing the engine. He first concluded this to be the result of reduced friction. However, valve springs began to fail. These engines are dry sump designs that flood the valve springs with oil to carry the heat away. It turned out that the lower oil temps. recorded were the result of the synthetic oil not being able to transfer heat away from the valve springs as well as the conventional oil did. True or not, that is the story that I was told.