Solenoids or Pneumatic (Air operated)?
Fact is that all Mercruiser OEM and True Hi-Performance systems have always used Pneumatic. In recent years the use of electric solenoids or "Choke Solenoids" found on tractors have been introduced as an inexpensive alternative. While effective the life span of the electric solenoid has proven to endure extensive use time due to it unintended use. In many case though it is the only available option
How Electric Solenoids Work
When DC current is applied, a magnetic field is generated within the solenoid by passing electrical current through a coil of copper wire and the plunger is drawn in. When DC current is removed, the magnetic field is released and a return spring (not shown) pushes the plunger to an open position. The force generated by a solenoid is dependent upon the current flowing though the coil windings. Solenoids draw a very high amperage or current while pulling the plunger into the coil, then a switch or control module to try and reduce amperage while in the holding mode or the closed position.
CORSA Performance Marine takes pride in mid 2003 as a part of CORSA Performance Marine's continuous improvement efforts, A change from an external electro-mechanical relay to a more reliable control module with an internal solid state relay. This change resulted in a reduction in both customer complaints and warranty claims.Solid State Relay Systems vs. Pneumatic Systems
How Pneumatic works
By using the same proven technology as you would find on heavy duty equipment or even the brakes on a semi truck. Air not only present a no heat environment it allows simple connections via clear nylon tubing. Pneumatic uses a design specific pump system that provides a sort blast of air to open the pneumatic solenoid mounted to each diverter. Once the diverter is actuated then a air solenoid locks the air in place sealing the connection. To disengage the system the air solenoid is merely actuated and the air bleeds off instantly. Proven, reliable, and beautifully simple.
There are major differences between pneumatic and solid state systems. To determine the advantages of each type, the following characteristics should be examined: RELIABILITY, DESIGN PACKAGE DIMENSIONS, AND RESPONSIVENESS.RELIABILITY:
Both types of technology exhibit similar levels of initial operation, over an extended period of time the solid state relay is more prone to electrical reliability issues due to its longer engagement load cycle from power being delivered to the solenoid. Pneumatic. Service life is excellent due to design specific products and lack of electrical draw or load.