I notice most of the string trimmer engines that I encounter. The crankcase and cylinder are made of very brittle material that can be broken off very easy, like plastic. If you crash with this kind of engine, it must be broken into pieces!! What kind of alloy is that, any name for those alloy ( I know is call el cheapo )? Do you know of any brand that have stronger crankcase material. I heard from someone in lawn forum that Stihl 4Mix crankcase use some sort of aluminum magnesium alloy that is stronger but I am not sure.

Any information?
Thanks