Paul,

The thrust figures listed by Vinny are for the latest versions of the P120's, mainly the SX version. If your engine is indeed 14 years old and has a serial number of under 1400 I would guess it will push around 24 - 25 pounds at full tilt unless it has been fully upgraded with the new style compressor, EGV, Diffuser, Chamber. The P120's from the serial number I listed above and older were around 24 - 25 pounds of blow. At 115,000 I would guess it is pushing closer to 16 pounds.

Just what I recall from running thousands of these engines over the years on test stands, etc.