|
I had a closer look at the broken parts. I did my quick test and they are almost certainly nylon. BMW likes nylon. The valve cover is Nylon 66 with 35% glass filler. (It said that. I am good but not THAT good) The trick with molding plastics is to use the most cost effective material for the purpose. The lawsuit almost certainly did not question a plastic professional and a lawyer just named a plastic they thought sounded good. If in fact they did start out with Polycarb then wanted to switch to nylon, they would have had to change the mold as shrink for nylon is a lot compared to Polycarb so all dimensions would have been out.
I examined the broken bits and I didn't see any obvious bad design elements.
Interesting my chain is tight, not a bit of slack at all. The tensioner on the exhaust side is all still intact. All the more reason for me to say in my case the chain slipped over the intake sprocket causing the intake tensioner to break.
I had not thought of the start-stop "feature" I would turn it off on any car I owned.
|