Hi Andre - "VW Battle engine" =3D "VW Beetle engine?"... If it's a 4-cycle engine, and the rotor you refer to is the distributor rotor, it turns at 1/2 crank speed. Jack --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .