Right-clicking the drives whilst sneaking (with an empty hand) will teleport you upwards/downwards relative to your current position. How high/low, depends on the redstone signal strength of the block directly on top of the contraption.

When powered, the bomb will instantly explode without any indication or delay.
Explosion Power: 4

When powered, the engine will break the block directly below it, except for Bedrock and Obsidian, and spit it out directly on top of it before it falls and repeats the process. 

Sources of "redstone signal" / "circuit power".
Circuit power is indicated on the top of the block. Ranges from 1 - 14