Valve 2000 Race UNDERSIZE 9×38.2mm 45 degree Exhaust
Stainless steel alloy 1,8mm undersize 38.2mm exhaust valve for 2.0 Alfas with standard 9mm stems.
VALVE UNDERSIZE EXHAUST:
With regard to the performance enhancement of our 38.2mm exhaust valve for 2.0 Alfas, there is a theory that the smaller exhaust valve diameter reduces over-scavenging in high compression/RPM engines and yields better performance characteristics. This is correct for pure race engines operating mostly above 7000 rpm.
It is our experience that 1mm oversize (41mm) is more appropriate in street performance, track day or vintage race engines and actually tests a bit better at low rpm.
For more info on valve sizing and cylinder head performance, you should consult the Jim Kartalamakis’ book, ALFA ROMEO DOHC HIGH-PERFORMANCE ENGINE MANUEL. This is pure engineering knowledge from deep experience building, testing, tuning and racing Alfa engines.
Valve 2000 Race UNDERSIZE 9×38.2mm 45 degree exhaust quantity
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