Quarter Scale Bentley BR2 Rotary Aero Engine - PART 11

摘要

Back to conventional machining and we'll start with the valves and valve seats. The valves are machined from 303 stainless and the seats from bronze; both are straightforward batch turning operations and, as with all batch machining, it's always prudent to make a spare in case of any over enthusiastic machining! The individual billets for the valves are faced to overall length plus 5mm of service stock which will carry a centre drilled cone. The first operation is to rough turn the valve stem leaving sufficient stock to be able to turn the shoulder radius (photo 170).