It's a little hard ot believe you're spelliing "Windrock" correctly when you are rarely spelling anything else correctly...
But you are right:
Try contacting these gentlemen in Brasil. They work for PetroBras and have published a technical paper "On_line Monitoring of Reciprocating Compressors" based on their work with Windrock equipment:
Nelmo Furtado Fernandes, Chemical Engineer. Senior Process Engineer at PETROBRAS Gabriel Passos
Refinery, Betim. MG, Brazil.
Jose Eduardo De Caux, Maintenance Technician. Technical Consultant at PETROBRAS Gabriel Passos
Refinery, Betim, MG, Brazil.
Sorry, I don't have e-mail addresses.