Abstract: The present invention is a separable driver-compressor combination with minimal modifications to incorporate a high production block design. One block is used for the driver engine which is appropriately modified to operate using various fuels. The other block is modified to incorporate crossheads and cylinders with several unique sealing and connecting features. The drive mechanism between the engine and the compressor has several embodiments providing a driver engine to compressor selectable speed ratio and optimizing operating performance. The compressor design incorporates a modular cylinder assembly construction technique. The dampening mechanism dampens out vibration energy eliminating the need for large mass compressor packages required by current design practice. This unique dampening system results in a smaller and lighter compressor package which will transmit extremely low levels of vibration to the base support structure without any performance penalties.