Quote:
Originally Posted by FlowSpecialist
Pulsating flow usually means the flow is breaking away from the port wall somewhere. The short side bend is the likely culprit. I doubt if the straight part of the port had anything to do with it. You may have changed the flow pattern further down though.
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I have older experience of pulsating flow with Ford Pinto 2000cc head and reason was short side turn, indeed. I agree your words makes sense. If flow is breaking away from port wall, it is reasonable that it will turn to continous pulsating motion. When flow breaks away from wall, pressure gets very low near wall and again flow turns near wall and etc. Does this sound right?
Quote:
Originally Posted by FlowSpecialist
Knife edged dividers between the two runners in 4v heads also often make a strange noise. I prefer to shape them with a rounded form as in classical teardrop shaped streamlined cars or planes. Knife edges are shapes you associate more with supersonic flow. I see no need for them in cylinder heads.
Dave
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I had allways wondered if knife-edging have any benefits over teardrop shape... Still, I have seen so many knife-edged guide bosses and 4v-dividers, that it made me to hesitate. Nice to hear I wasn't wrong.
Again my theory is for knife-edging that flow change sides over knife-edged obstruction. That will also be explanation if flow is pulsating.