Differential Pressure Test Kit

[Karetaker]

I would like to purchase a test kit; any suggestions on brand, place to purchase, etc.?

Thanks.

[noelf]

Are you thinking pitot/static or engine cylinder testing?

[rightrudder]

I have this one. Works well!

https://www.aircraftspruce.com/catal...clickkey=24263

Description is a little misleading, as the copy indicates that it's for a Rotax 912, but it has fittings for Lycoming/Continental.

[Karetaker]

Engine cylinders. Thanks.

[DanH]

Originally Posted by Karetaker

I would like to purchase a test kit; any suggestions on brand, place to purchase, etc.? Thanks.

These days the fundamental choice is to buy a test set with or without a Continental orifice. You'll need the extra doodad to discuss anything about cylinders with a Continental rep. Not needed for a Lycoming.

Read the sidebar for details:

https://www.danhorton.net/Articles/0...ompression.pdf

[Karetaker]

Thanks Dan. I need something to test both my Continental A65 and my some-day-to-come Lycoming. I think I have a handle on it now.

[akabud]

Originally Posted by Karetaker

Thanks Dan. I need something to test both my Continental A65 and my some-day-to-come Lycoming. I think I have a handle on it now.

I believe you need different testers for A65 and the Lycoming. They have a different size orifice for different displacement.

[DanH]

Originally Posted by akabud

I believe you need different testers for A65 and the Lycoming. They have a different size orifice for different displacement.

No, they don't.

The gauge orifice for small engines has specified diameter of 0.040”
and an entrance angle between 59 and 60 degrees. You’ll find references
requiring a 0.060” orifice for use with a bore diameter larger than
5 inches. However, a manufacturer’s service information takes priority
over any advisory material. Lycoming SI 1191A and Continental SB 03-3
specify the 0.040” orifice for all engine models, including those with
bores in excess of 5 inches

[akabud]

Originally Posted by DanH

No, they don't.

The gauge orifice for small engines has specified diameter of 0.040?
and an entrance angle between 59 and 60 degrees. You?ll find references
requiring a 0.060? orifice for use with a bore diameter larger than
5 inches. However, a manufacturer?s service information takes priority
over any advisory material. Lycoming SI 1191A and Continental SB 03-3
specify the 0.040? orifice for all engine models, including those with
bores in excess of 5 inches

Interesting.
So all of us out here that are using the E2A-1000 tester that ACS says is for cylinders of 5.00 inch bore and over are getting erroneously high readings?

[DanH]

Originally Posted by akabud

Interesting.
So all of us out here that are using the E2A-1000 tester that ACS says is for cylinders of 5.00 inch bore and over are getting erroneously high readings?

Yes.

https://www.lycoming.com/sites/defau...ompression.pdf