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Old 07-21-2009, 02:12 AM   #61
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Join Date: Aug 2008
Posts: 2,473
Being a 4 Liter 4 cycle engine, every time the engine rotates once, it ingests 2 liters of air. That's at 100% Volumetric Efficiency.
At idle and low cruise VE's pretty close to 100%, at 2500 it may be down to 80% with no restriction in the intake. That's just the restrictions from the valving, intake ducting and exhaust flow.

That's 2 Liters for each rotation.

At 2500 RPM, a normal high cruise speed, it's ingesting 5000 Liters each minute (2L X 2500Revs/Minute = 5000.)

That's an awful lot of air, or anything, to try to get through that small snout.

ANY restriction of that air cuts down the VE == power, mileage etc.

Now think when we rev it hard - 4000 RPM that's 8000 Liters! A built-in governor!!

And then at 6000 - ???

But - the issue at hand is making sure that air is CLEAN - if that air's dirty, VE becomes irrelevant as the engine won't last long.

The search for super clean and little or no restriction is the task - and put it in a small space so we can have our other goodies (OBA etc.)

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