Quote: ....The old rule of thumb is 10 psi. for every 1000 rpm. Now a days it is more like .8 or even .7 for every 1000 rpm. The key is volume, keeping the volume up and the pressure down is the key.
Anything over 70 plus psi can cost you 10hp to 15hp easily.
We make 1120hp and spin the engine to 8800rpm+.....the engine never sees over 70 psi. and no, it's not a dry sump.
yeah... I know all about it(decades old formula).... What bothers me about that "rule of thumb", using that logic 10psi at idle is ok. I don't know how you guys feel but I don't want any big block with less than 60psi at idle. I start to sweat when any of my motors have less than 60psi because it usually means bearing problems. Within a reasonable psi, volume means nothing if you aren't getting some pressure to get it where it needs to go.
IMO, That rule of thumb should be revised for maybe... 4000rpm and over?
