Can anyone tell me if this is normal?

[Nilao]

try to cut one cylinder at a time. You may have a injector issue causing a fuel knock or it could be a wrist pin issue....you should be able to isolate it by taking the strain off the cylinder by cutting it out. I'm not certain where the noise if coming from but you shouldn't also rule out a compressor knock or the gears in the front housing being the source of the knock either...