Just wondering if anyone knows the reduction ratio of the Velvet Drive in a 1980 Albin 36?
Its probably in the 2-2.5 range but if the plate is missing then you really don't know. One possible way to find out is to use a photo tach on both the engine and the output shaft. While cruising along, "shoot" the engine speed and then the shaft speed.
They aren't cheap but maybe you have one or want one or have a friend who has one. Harbor freight sells one for $40. Don't know the quality, They usually sell for ~$100.
Ken
Or bar the engine over and measure the tranny output flange change.
May have to do several revolutions to get more accuracy.
Can't do that with a Velvet Drive. They're hydraulically engaged, so if the engine isn't running, there's no pressure and it won't go into gear regardless of what you do with the shifter.