restrictor fitting for manifold pressure

[alpinelakespilot2000]

Is this restrictor fitting from Wick's appropriate for our manifold pressure needs? The only restrictors Van's sells are 45-degree fittings that do not fit in the MP port of some #4 cylinders. I know some people have made their own by filling fittings with JBWeld and then drilling a small hole, but I'm curious if this option from Wicks may be an even better way to go...
Shown on two pages:
http://www.wicksaircraft.com/catalog...767/index.html
http://www.wicksaircraft.com/catalog...767/index.html

[Mike S]

I found the 45* unit would not work for my engine, made my own with PC7, drilled out with a .050 or so bit.

I did counter drill the fitting halfway through before I put the epoxy in, about .080--.100" larger, and plugged the smaller diameter remainder of the hole (with a drill bit that fit the original hole) at the step from the larger hole.

This only allowed the epoxy to go in the larger diameter section.

After the epoxy cured, I removed this drill/plug, and now the epoxy plug is trapped in the larger diameter portion of the fitting. This should keep the epoxy plug from being able to be sucked into the engine.

[shuttle]

Steve,
I had that issue. The Van's 45deg restrictor wouldn't fit in my cylinder port either. I already had the Van's restrictor so I looked for a different solution.

I fitted a straight unrestricted fitting in the cylinder port and attached the hose to that. The restricted fitting is on the other end of the hose, The restricted fitting goes into a female-female 1/8NPT bulkhead fitting on the firewall. That gives a simple 1/8NPT setup for the in-cabin MP tubing to attach to.

I know that most EFIS/EMS manufacturers say you don't need the restricted MP line but I believe that the restriction does serve to steady the MP reading a bit.

[Jeff R]

I made one using a rivet (AN5) and some epoxy. I filed down the diameter of the rivet to match the hole in the AN filling (I may have enlarged the hole a bit by drilling - can't remember), and then lightly pounded the riviet in with just a light coating of epoxy. I then cut/sawed off the head of the rivet, smoothed it, and drilled a small hole (1/16" dia) down the centerline. The light pounding sets the rivet very tightly and the epoxy ensures there are no gaps and helps ensure the rivet won't come loose.

I can't take any credit for this idea. Someone else posted this technique here a while back.

[AirbusPilot]

I did my restrictor using a needle and a brass tube that fit inside the tygon tube from engine fitting to dynon sensor. I made my restrictor soldering the needle inside th brass tube, I used this kind of restrictors long time ago on RC model turbines.