Gordon Misch
MEMBER
Toledo, Wa (KTDO)
For sure, thanks! Got a line of wx moving thru right now so test flight will be a little later.Just make sure you're not starting out slow when you decide to trust it.
For sure, thanks! Got a line of wx moving thru right now so test flight will be a little later.Just make sure you're not starting out slow when you decide to trust it.
Seems to be the preferred spot.
If it doesn't work out, I have a larger one around here somewhere I'll give you. It should produce enough vacuum. View attachment 39970
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Well, it didn't work at all with the venturi in the old location.Has this setup ever worked? It sounds like the venturi works fine. You get instrument operation in turns? Sounds like it's still 'shaded' by the cowl door. Try another style venturi or put a spacer under it to move it out closer to clean air.
Take a blower chuck and shop air and blow air into the venturi from about two feet away. If the instrument works, the venturi is wrong or located in a bad place.
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I didn't have the suction gauge attached when test flying today. I figured if it worked well, then I'm done. And if it didn't - well, here I am.How much suction did you get during test flight with T&B attached to system?
If you can reach it just remove the screw-on air filter before the whole instrument. Then try again. Might just be the filter's constipated with dirt. If so disassemble and clean.
The needle can jump a bit until a steady coordinated 3*/sec turn is established then should settle into the doghouse.
Why not use NAS 487 grasshopper nuts for assembly?
Disregard..... connected the venturi to the shop vac with instrument and suction gage connected. Adjusted the suction to 2 inches.
That's where I relocated mine to, and it seems to be fine. Gives about 3+ inches of vacuum static.Just for the h--- of it I looked at N3667N and the venturi is in line line with the cowl hinge on the left side. This PA12 still has all its original parts and no mods, so I would guess that was where Piper put it.