Re: MaNtZeL airbox
Had die modificatie ook gezien op internet, lijkt wel goede resultaten te leveren.
Zag ook deze tekening van de mod op een Catera :
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Werden wel wat opmerkingen bij geplaatst, waaronder het hercalibreren van het MM systeem
Hier de tekst :
The main benefit of using an airbox and intake runners is a small pressurization of intake air. That's because the airbox is a Helmholtz resonator. That is, a resonance effect occurs when you connect an enclosed volume of a suitable size and shape to an engine’s intake stacks causing the air inside to resonate at a frequency that results in pressure peaks which coincide with the cylinders’ intake stroke frequency (at a particular RPM.) This can theoretically increase power by 10–15% within a particular RPM range by boosting airflow into the engine.
Airboxes need to be well-sealed and stiff in construction to maintain these resonance characteristics. A simple way to illustrate this is to blow across the mouth of an empty bottle. The sound you hear is the natural frequency of a Hemholtz resonator. If you change the shape and free air volume of the airbox, you change its resonance frequencies, and the engine RPM at which it responds to enhance filling the engine with air. If you fill the empty bottle with filter foam (mostly air) and blow across it, you'll get no resonant frequency sound at all.
An airbox also functions as a plenum, a space where the air velocity is reduced so as to eliminate turbulent airflow prior to being smoothed and accelerated down the velocity stacks. In fact, if you just place your finger anywhere near the edge of the top of the velocity stack you'll see dyno power dropping off due to the disturbed air flow pattern. The air in the plenum is also considered "free air." That is, it’s already passed through the filter and air tract so it can be supplied to the engine without any flow restriction. Our engine has a separate plenum so I guess the "airbox" is merely a filter housing.
If you use the auto industry's standard calculation of air required for free flow within the air intake system, you should have at least 130% of engine capacity in available air volume between the throttle butterflies and the air filter element. This means for the best results from our 3.0L engine the air volume of the the intake tract, beginning at the airbox and ending at the throttle bodies should be at least 3.9L.
Since the Mantzel Resonator has no moving parts it must be tuned to a specific air velocity, probably at wide open throttle. Anywhere else on the power curve and performance must drop off affecting low speed driveability. The factory dual and multi ram systems must be designed to adjust the air velocity to the engine RPM and provide peak performance across a wide RPM range.
Ben heel benieuwd wat de resultaten zullen zijn, veel succes ermee !
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