Quote:
Originally Posted by Coheed
The valve springs are likely only good for a temporary 8000rpm, they will probably float the valves around that point.
5000fpm is the practical limit for a factory rod/piston combo. A built engine can see speeds over 6000fpm.
My SR20 revs to 9000rpm. VE baby woot!
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Subaru builds pretty stout valvetrains and you would be suprised at how good the oem stuff can be. I've already beaten this motor up good and she's a gem. I was running 8k RPM with my Hydra EMS powered FRS and man thats what the engine needs to stay in the sweet spot.
That may very much change with boost. We shall see.