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Originally Posted by veg_burner
i pressurized the ALDA with a gas line tester fitted with a 1/4" barbed hose to 1/2" NPT connection and a bicycle pump. (i really need to get myself a mityvac...) on both ALDAs I have i can hear air escaping at the ALDA.
i was surprised that so many of the ALDAs i tested failed to hold pressure. i figured surely it wouldn't be hard to find a replacement... i wonder how many 917s are out there that are lacking boost power from a leaky ALDA.
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The ALDA does not need to hold pressure for proper function. It's internal seals are probably not all that tight so air will bleed across them. The engine has more than enough manifold pressure to overcome a small leak in the ALDA. So, if you can pressurize the ALDA and it leaks down in 10 seconds or more, it will be perfectly fine on the engine. It may even be OK if it leaks down in 5 seconds. It all depends on the flow rate through the 4mm Tecalan lines. If the flow rate is much greater than the leakdown rate, there will be no effective drop in the pressure to the ALDA.