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| Re: Round Ports for the win! |
Subject: Re: Round Ports for the win!
by jmac on 2016/4/3 13:43:59
The problem is that intake valve temp isn't a huge factor, exhaust valve temp is, because it's the one that runs much hotter relatively, which is why you need different material for said exhaust valves and partly why special hardened seats were initially fitted to exhausts (in cast iron heads, obviously alloy heads had seats for both from the getgo)
What's the engine combination based on - high compression NA engine or high boost turbo/supercharged or something else? If it's boosted, it becomes somewhat moot since you'd need a bigger chamber anyway (still within the basic shape/style already mentioned) to get the comp ratio down where you need it. Exhaust valve seat width would ideally be selected based on it too - turbo requiring the widest (adn it's all relative mind you) contact patch, followed by supercharged then NA. If you're running e85 it has a decent cooling effect on the charge in general and this can be a factor too (though it's often as not offset by the fact that it enables more boost to be run and indeed more generally therefore is run)
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