OK Ihave seen all aluminum alloys in the smaller engines rods that routinely turn up over 15,000. So a .15 size engine with a big togh all alloy rod would be a good choice in what material? And what about a .40 running upwards of 15,000? Hopefully it is moot since I have found out Ican buy inexpensive replacement rods for the Norvels that seem to have really weak rods.