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Originally Posted by miyu1975
....I am trying to figure out if my engine already has or needs a sniffle valve. Where would it be located...
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Here you go Ryan....AFP sniffle, the blue fitting. Plumb a line to a point just outside the cowl cooling air outlet, or anywhere else allowing liquid to drip to the ground.
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If the valve is installed, by it's very design, will vent any pressure in the manifold that is in excess of ambient cowl air pressure, degrading manifold pressure recovery when the lower cowl pressure is ambient or slightly below.
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Interesting point. As you say, it is a matter of relative pressures. Plumbing the sniffle to the cowl exit should cause it to open and flow air down the drain tube in the special case of excellent dynamic pressure recovery and high IAS. For a SARL guy at 200 knots and 2500 ft, theory says sump pressure would be higher than ambient by 0.8 to 0.85 psi, given the pressure drops reported for better filtered and unfiltered intakes. However, given a large enough intake opening, would it result in any measurable pressure loss to the engine? The supply is unlimited while the leak is limited to flow thorugh a constricted -4 fitting.
Hmmmm...I have a few small Parker solenoid valves....