Wait, I thought brass expands more than iron or steel does....
Wait, I thought brass expands more than iron or steel does....
Yes and the aluminum piston has a slightly higher expansion rate. With iron on iron the expansion rate is the same but that means the larger object expands more than the smaller so the almost 0 gap between piston and cylinder grows larger,. With an aluminum piston allow matched with the right cylinder brass alloy the gap is closed off
somewhat.
Fox Stunt .35's have very little cooling fin area so they overheat quickly on a lean run.