Originally Posted by
Chip
Seems unlikely to me the boost would effect it, and im sure people doing N/A builds reguarly see that sort of relatively modest rpm?
For what it's worth - I did a NASP ST170 build last year that's doing 210+bhp which revs to 8200rpm.
Customer has been using it as his daily driver and done 20,000 miles so far in it.
That's using a billet geared pump, knife edged balanced crank, TTV solid flywheel and standard crank pulley.
I'd love to destructively test a couple of engines in the way Lee is doing - at the moment I recommend billet geared pumps on any builds regularly seeing over 7500rpm.