In message <Pine.SUN.3.90.961002102742.5813I-100000@mamie.snet.com> "Bob D'Amato" writes: > What does speed have to do with it? Do the valves or pistons get LONGER > at higher rpm's? :) Valve inertia. The MB engine is said to be interference-free when hand turned and not so if the belt fails at speed. -- Phil Payne phil@sievers.com Committee Member, UK Audi [ur-]quattro Owners Club