Originally Posted by DaBoy12s
Originally Posted by Chip-3Door
Originally Posted by Redkop
The straight grooved on the older type APs used to face forward... the newer ones with the curved grooves face backwards.
Ah, didnt realise it was the shape of the groove that made the difference.
Any idea why?
i dont think the direction of the grooves is that important its the vanes on the inside of the disk that matter
Thats correct its to pull the air through the disk. If the grooves are the wrong way round it will just make more noise (so I read a long time ago).