Venuri hookup help

[108pc]

I'm trying to hook up the venture instruments in the Clipper and need some help. I have a T&B and a DG. My plan is this:

From the Venturi to the T&B. From the T&B to the DG. From the DG to an intake filter.

My questions are:

1. Is this correct?

2. Do I need a regulator? (There wasn't one before and I'm going off of the assumption that I have a 9" venture based on the limited info I could find on my previous research).

3. What filter do I need to get?

I looked for a piper drawing on the CD that addressed this but was unable to find one, so if you have one that might be helpful too!!

Thanks in advanced for your help!

Wayne

[P.o.P.]

Doesn't sound right to me.

AC 43.13-1 used to have a drawing . I'm unsure if the -1B version still does.

Most T & B's use 2 inches of vacuum.

DG's & AH's use about 4.5 inches.

A 9 inch venturi may REALLY spin it up!

If the "9 inch" is what I'm thinking of ; it could drive BOTH a DG & a AH.


Vacuum Regulators can be "pricey".

You will probably need one for the DG.

You could use the 9 inch & a needle valve to get down to 2 inches.

You would need a gauge for these adjustments.

Many aircraft of this period used a 2 inch venturi for the T & B only.

Some gyros have filters in the instrument.

Obviously a pain to change.

I prefer to use a Central Air Filter similar to a 1976 C-150.

No mount; just Ty-rap in place.

Do your research BEFORE your installation.

[Steve Pierce]

I don't know the answer to your question but would look on the Pacer/Tri-Pacer and Colt drawings if you haven't already. As far as I know Piper never installed a venturi on the Clipper but I know it has been done.

[108pc]

Thanks Steve and P.o.P.

The venturi was running a T&B and DG prior to redoing the panel. It was an "old school" box style DG and the system did not have a regulator. And you're right P.o.P, they have internal filters! I've replaced the DG with a modern style and will use a central filter. I don't like the word"assume", but can I assume the spin rates are the same with the new instrument? I'll look into this more, but if anyone has info they can share I would appreciate it.

Wayne

[P.o.P.]

I believe the 3 1/8 "modern" gyro needs a little higher vacuum.

Maybe 5 in as opposed to 4.5 for AN >