|
Sorry, I just don't buy the theory that the vacuum created by the pump is used to hold the piston of the vacuum pump away from the roller coaster rail. Sounds a little like perpetual motion machine theory to me. The pressure required to keep the piston away from the rail is always greater than the vacuum that can be produced by the pump.
And even if it did there would be moments in time where the follower bearing was in transition. During the transition time where it was only part-way pulled away from the rail it would be slamming into the rail on every rotation until it managed to get itself parked. Then when the vacuum dropped a bit, the follower would again begin to slam into the rail until vacuum dropped enough that it could again regain nice smooth contact with the rail.
It's kind of the opposite effect of valve float. The valves need to be in contact with the cam at all times or it beats itself to death in short order.
I've been wrong before and I reserve the right to be wrong again!
__________________
Current Stable
- 380SL (diesel)
- Corvette C5
- Manx
- Baja Bug
- F350 Powerstroke
- Auburn Boattail Speedster replica
|