My students are making a stirling engine as a project. They selected it, and I support it. Had to figure out the materials,and what to buy. No budget, hate to say, the budget is frozen shut, no more spending (and I had a few bucks left, and the year is only 1/4 gone-----a bit of panic here). But alas, no matter HOW much I complain, this is the way it is....but i digress.
So a part of the engine is the "power cylinder". 2 inch OD, 1.505 ID, cast Iron specced. I m thinking of subbing 11L17 or maybe 4140 for it - most likely 4140 because of less movement. Thought of brass.
I know a bit of the lubricity of cast iron, but alas, will NOT have it unless I spend the $91.00 for the 6 foot bar, only need 24 inches, and through MSC, this is $42.00 and a shipping fee. Before running out and buying this, would like to know if alternatives exist in steels. I also have D2, A2, H13, and S7, and even brass and bronze on hand in major quantities.....
Looking for ideas, suggestions, and REASONS.