037 MPS characterisation, Part no 0 280 100 037 Options

[velum]

I am looking for the characterisation of a 037 MPS (0 280 100 037). Does anyone know what typical inductance values (H) should be for a series of vacuum levels (in. Hg)?

I have a leaking 037 MPS, a rebuilt 043 MPS and I am expecting a 049 MPS. My car is a '73 914-4 2.0L FI. I believe the 037 MPS is my car’s original one. I was going to try to adjust the 043 MPS and the 049 MPS to the same specs as my leaking 037 MPS which has not been rebuilt and still has the epoxy seal on it. So I took measurements of the 037 MPS with a vacuum pump and a multimeter to measure the inductance. I was surprised to get inductance values quite different from the ones Paul B. Anders is displaying on his site for a 037 MPS. You can see a video clip and a chart showing the vacuum and inductance measurements of my MPS here.

According to Paul B. Anders, the 037 MPS inductance values for 0 in. Hg, 4 in. Hg and 15 in. Hg should be 1.44 H, 1.26 H and 0.72 H respectively. This is at his altitude of 1,280’. These values corrected for the pressure at sea level are 1.49 H, 1.22 H and 0.77 H. This is quite different from the values I measured on my MPS, which are respectively 1.13 H, 0.92 H and 0.67 H.

Does anyone else have typical inductance data for a 037 MPS?

Cheers!

JF