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Here's the parts I used...
• 1 Saab oil filler cap
• 3' of fuel line hose, SAE 30R7 3/8" ID x 5/8" OD ($7.59)
• 2 brass fittings (Edelmann 846460) 1/4" NPT x 3/8" Hose Barb ($9.76)
• 1 plastic barbed fitting (John Guest (PI251612S) Tube to Hose Stem 1/2" Stem x 3/8" Hose Barb) $5.49
• 1 Dwyer Rate-Master RMB-51 flowmeter (surplus, $30), 2 - 20 SCFH Air
Start by repurposing your old oil dipstick assembly into a test adapter. Disassemble by depressing and tilting the spring loaded sealing bulkhead to one side and then *carefully* using a screwdriver to pry apart the black plastic bulkhead from the yellow plastic cap. Avoid damaging the rubber ring seal. Retain the spring. Cut the dipstick wire flush with a wire cutter. Then drill holes through the center of both plastic parts: for the yellow cap (5/8" dia.) and the black bulkhead (1/2"). A Dremel with a drum sander may be useful to expand and smooth as req'd. Then, use two-part plastic epoxy to mount the fitting on the black bulkhead, with a fillet to assure no pressure leaks. Allow the epoxy to set and cure. Reassemble the bulkhead, ring, spring, and cap. Then attach one end of the fuel line hose to the barb fitting of the test adapter, and the other to the top port of the flowmeter (which is appropriate for measuring inward flow). The bottom port should be be filtered to prevent ingestion of particulates. See photos below.
Use of the PCV flow tester is straightforward. Attach the adapter to the oil filler pipe, vertically hang the flowmeter from the hood and start the engine. It is possible to correct for non-standard temperature and pressure (but knowledge of actual pressure would require a pressure gauge on the flowmeter outlet).
In NINES #284, Chuck Andrews reported maximum readings at idle (warm engine, no brakes) of nearly 10,000 ccm (cubic centimeters per min.). This is equivalent to about 21 SCFH and guided the sizing of the flowmeter range during my market search. As can be seen in the photo below, the indicator float (reading taken at center of ball) has settled just slightly above 20 SCFH, approximately five minutes after cold start of my '04 9-5 Aero at idle.
->Posting last edited on Tue, 1 Aug 2017 21:34:34.
_______________________________________
'04 9⁵ Aero Sedan (m/t)
'04 9⁵ Aero Wagon (a/t)
---
'99 9⁵ SE (LPT) - donated in '20
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