I figured it was because the exhaust gas was being pushed out and did
not have much of a choice how much would leave. And the on intake side
it was being pulled or dragged in and we want to optomise how much comes
in. The only thing pushing the air in is atmospheric pressure.
Maybe this is just a different way of stating the same thing.
Mike Thompson
On Monday, April 29, 2002, at 11:50 PM, Hugh Fader wrote:
> Nelson and I were having a discussion off the list about valves. I
> said I
> would investigate why the exhaust valve is smaller than the intake. I
> discussed this with a colleague who is a powertrain engineer.
>
> There is a limited amount of space for the valves. You want to make the
> intake valve as large so more air and fuel can flow in.
>
> The exhaust valve opens with high pressure from combustion gasses
> behind it.
> Because of this gas can flow out of a given area at a higher rate, or
> the
> area can be smaller to get the same flow.
>
> Since the exhaust valve can be smaller, it is made smaller leaving room
> for
> a larger intake valve.
>
> Excuse me if this is common knowledge. Thought I'd share it anyway.
>
> - Hugh
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