What is considered excessive blowby in a Dyno?

[rrod]

I’m searching about this topic and the only thread found was http://rawze.com/forums/showthread.php?tid=587 where he talks about 4.5 blowby, which apparently is good.

Could someone explain what amount and why would be considered excessive in a Dyno test result ?

I just learned reading another thread that :
“If you have crank case pressure issues you have one or more of three things that can cause this. One too much blowby from piston rings. Two aircompressor is pushing pressure into crank case. Three the turbo seal is allowing boost pressure to cross into oil drain which goes into crank case. Rawze has video on how to check blowby with homemade manometer.
http://rawze.com/forums/showthread.php?tid=65”

I guess that complicates things, maybe to be excessive first have to find out what is causing it. Some input would be appreciated.

Thanks