The K-Jet measures mass air flow, the combination of mass plus factored with rate, not velocity -- flap moves against a spring, it doesn't measure the pressure drop across a venturi (like a carburetor does). Not to split hairs, but it does account for the mass of the air as well as the velocity, egro a mass airflow measuring device.

It was orignially deleloped in the 50's, I think, for gas turbine engines -- very nicely, it allows one to measure a fraction of the air going into the engine and controls fuel for the whole thing, instead of trying to stick a mass airflow sensor in front of a 2000 kW generator! Doesn't allow for single part control, though, and the current EPA thinking (or the industries interpretation of if) is that every single cylinder cycle must be under complete mixture control.

Sounds like overkill to me, but I didn't get asked....

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!