Knocking sound on acceleration when the heater gauge reaches quarter

The knocking is usually a rod bearing in the engine. As the engine warms up the oil is thinning out, the oil pressure drops. Have the oil pressure checked with a mechanical gauge to verify if the engine has the proper oil pressure when the engine is warmed up, while the engine is knocking.

Hy my opel corsa problem accelerator if u press is cutting and make a noise engine