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Hello,
Not to worry too much about how much filter area you need to expose to the atmosphere, whether it's thick or thin.
I say this because a four cylinder engine only has to draw in one cylinder amount of air at a time.
2.3 liters divided by 4 is about .57 of a one liter bottle. It's not much volume at sea level.
2500 rpm divided by 2 ( ever other revolution) is 1250 divided into 60 seconds gives you about four hundredths (0.048) of a second to pack it in, if it has time too!
In your case, it's not much air, let alone, little time!
At 9,000 feet you lose about one inch of Hg. per thousand feet of rise. That is parking you in the neighborhood of about 9 inches towards a vacuum outside the engine. An engine idling at sea level draws up to 21 inch Hg vacuum inside on a good day. You are standing 21 inches Hg.
Your engine is stopped on the negative. It has to be running a deficit right away to crank up.
Luckily the ECU can trim that much pluse width time off the injectors opening, per request of the Air Mass Meter or it would be flooding itself. That's call altitude compensation big time!
This really comes down to you need a supercharger to be switch on when needed or expect a whole lot of lag time with a turbo charger still!
The air you need is not outside there and that means part of the 20% oxygen @ sea level content is not there as well.
Above 10,000 feet you should be wearing some type oxygen mask if you are working or climbing or you will start getting sluggish like your car! Small aircraft pilots are not allowed to fly up around 10,000 ft without oxygen on board.
Taking off on a hot day at a high altitude airport is difficult due to the lack of air density under the wings let alone the engine power loss issue.
A real long air strip is needed or a deep canyon just past the edge, to drop down into! Yikes! 😁
An oxygen tank onboard with a port hole on the intake would help make up for some of the gas deficit but Still, it's a volume issue.
One needs to get the compression ratio up for an efficient burn. Then the amount of fuel quantity or energy, can then be increased for more power output.
So it's back to using a blower to make up the total volume. Forget the amount of filter area!
Besides, the AMM and the O2 sensors, running on any improper oxygen percentage, with uneven dispersal down the intake runners, really, could make things go wacky per cylinder wise.
The burning of valves and holes in Pistons come to mind! (:-(
Yep, a blower is needed, to get air pressure or volume back up to where the engine was design to run at sea level.
I got it! Try this!
Maybe a remote controlled 14 volt battery powered leaf blower stuck right into the ole' intake snorkel! (:) Now we're talking! (:-). If some one hears it, because you left it on, just tell them, it's a cooling fan! (:) Yep, in winter too!
Its that or let the engine just huff and puff like us humans! (:-O)
Have fun way up high!
Phil
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