Originally Posted by Oktas8
Barit1
Again, and hopefully without causing offence, no, no, no. Manifold pressure (even that which drives windscreen wipers) is not related to the carburettor venturi. A fuel injected engine, which has no venturi, still has a variable manifold pressure as a function of throttle and rpm. Windscreen wipers etc might be driven by the pressure difference between the atmosphere and the induction manifold. Carburettor doesn't come into it...
Without disagreeing with your wording, I submit that
the pressure difference between the atmosphere and the induction manifold.
is (neglecting air filter and duct losses) the same thing as the Pdiff. across the venturi.