How big of an engine can oval vents support?

[gimmesomeshelter]

Hello-

I purchased a copy of Desktop Dyno, and as you might expect, my dream engine is getting bigger and bigger. My current darling has a 74mm stroke, 80mm pistons, and 38/31mm valves. I'm concerned that my oval era engine vents aren't capable of supporting the larger fan, carbs, and higher RPM's. Assuming that I don't cut any extra holes, or install any tennis balls, how large of an engine will an oval's vents support?

Thanks,

Paul
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"I would rather have questions that can't be answered than answers that can't be questioned."

Richard Feynman

[TWD]

I had to prop open the bottom of the lid to get enough air into my '54 Bug with a mild 1776.

[Eaallred]

Consider that for a bone-stock 1600cc dualport, VW had the louvers under the rear window, four sets in the decklid, then an additional vent behind the rear license plate.

Again, for a bone-stock 1600cc dualport, VW eventually ended up finding it necessary for that much intake area into the engine bay.

So from VW's standpoint, a stock bodied oval window bug wouldn't be able to make use of extended HP use with anything larger than stock without increasing it in someway or another.

Now, put-putting around town and short bursts of power will work fine with larger motors, but nothing extended.
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Eric Allred

You have to remember something: Everybody pities the weak; Jealousy you have to earn.

[water guy]

I find this interesting. If I have a 36hp Okrasa in a 60 bug with a conv. decklid, could this set-up not allow the engine to get to its operating temp.
I would think it would be the lesser of two evils to run a little warm? At least in sunny Washington state. I think having a oil temp gauge would be a smart thing to have.
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'55 Porsche Continental
'63 Firetruck

[Eaallred]