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| Equally Sized Valves |
Subject: Equally Sized Valves
by Liebonhardus on 2013/6/15 9:07:20
Hey,
I was just reading through some of the articles in the Tech Wiki and wondered:
Why the intake valve is significantly larger? I understand the principle of a larger intake valve means air for power is more readily available, but take this FIGURATIVE example:
40mm carb throat - 40mm intake throat - 40mm intake valve, but on the opposite end, 40mm header runners - 40mm exhaust throat - 35mm exhaust valve. I know I'm not quite the sharpest pencil, but I thought the pressurized exhaust gasses need the larger valve for a quicker and smoother escape? Even in boost applications, an enormous intake pressure of 2 bar still doesn't have the flow and thermobaric need of the exhaust gasses after a compression ratio of 8.5bar.
And if this works so well, why do DOHC head use symmetrical valves? I'm just reeeaaally curious and I'd love to learn from you gentlemen.
Btw, anyone try symmetrical valves?
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