A loud knocking noise in the motor of a car at high speeds is most likely the engine. There could be another issue with the transmission if the knocking only happens at high speeds.
worn, lose rocker arms
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Driving at 50mph or above what causes a loud knocking clicking sound during acceleration?
if the engine is knocking really loud you probably need to overhaul the entire engine or get a new or used engine because loud knocking is not good
yes you can rebuild a knocking motor. its best to rebuild it from block up and it may get pricy but its worth it
because its either cold and not warmed up or you lifters are knocking but the would be a louder knocking sound
No
you may have a rod knocking and you need to take it to a shop asap
Bad bearing or rod
A little kid in the trunk with a hammer
Usually, knocking indicates bad bearings on the crankshaft. You are going to have to budget for a rebuild on the bottom end of the engine. If the engine has extreme mileage, you would be better off with a remanufactured engine. your best bet is to get a used motor or if you have the money then buy a new one but either way they are kind of spendy. the cheapest motor i have found was used and priced at $500