It's hard to help you when we don't know which/what generator you have.
Attached is some information on a third brush generator.
Attachments
3rd Brush Generator 01.jpg (161.95 KB, 94 downloads)
3rd Brush Generator 02.jpg (198.46 KB, 93 downloads)


"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."