HF leakdown test is a Piece of Big Steenkeeng SHTUFF but here is
..........how I hope to fix it
Bought one of these awhile back thought "how bad can it be.?" Paid what, 40 bucks?
Cylinder Leak-Down Tester
Looks GREAT, right?
HERE IS the problem. If you look up the developmental history of leakdown testers, they are pretty much based on a regulated (80psi or) 100psi supply and a 40 thousands orifice. A regulator and 100psi gauge, along with a few fittings is all you need
TURNS OUT the HF thing DOES NOT operate at (80 or)100psi. It operates somewhere around >????15 or so psi and the BIG PROBLEM is that the regulator is unstable at that setting IE it "pressure creeps." This means your readings vary, and it's also a PITA to reset
As an added Chineseoated bonus, the instructions are just plain incorrect. Whoever wrote them has "no idea."
Wiki:
Leak-down tester - Wikipedia
So "whut be" de plan? Well easy, I think. The basics are all there.....a gauge(s), fittings, regulator, nice box, etc
You don't REALLY need two gauges, you really only need one on the cylinder side of the orifice. So the plan IS to attempt to duplicate the .040" orifice "somewhat" remove and plug the port for the 100psi gauge and then move THAT gauge to the cylinder side, leaving the "calibrated" gauge on the shelf "somewhere."
Then the 100psi gauge will read "reciprical" IE you set it unconnected for 100, then 80psi would be 20%, 40 psi would be 60% leakeage, etc. Of course it's relative
I actually built one years ago, but the fittings, gauge, and regulator have been used for "other stuff."
I think I'll search around and see if I can BUY an actual orifice, Wiki says:
"In the United States, FAA specifications[1] state that engines up to 1,000 cu in (16 L) engine displacement require an 0.040 in (1.0 mm) orifice diameter, 0.250 in (6.4 mm) long, 60-degree approach angle. The input pressure is set for 80 psi (550 kPa), and 60 psi (410 kPa) minimum cylinder pressure is the accepted standard."
Got that? Neither do I LMAO
From the Wiki page, even tho they mention 80psi, this seems to be set for 100
..........how I hope to fix it
Bought one of these awhile back thought "how bad can it be.?" Paid what, 40 bucks?
Cylinder Leak-Down Tester
Looks GREAT, right?
HERE IS the problem. If you look up the developmental history of leakdown testers, they are pretty much based on a regulated (80psi or) 100psi supply and a 40 thousands orifice. A regulator and 100psi gauge, along with a few fittings is all you need
TURNS OUT the HF thing DOES NOT operate at (80 or)100psi. It operates somewhere around >????15 or so psi and the BIG PROBLEM is that the regulator is unstable at that setting IE it "pressure creeps." This means your readings vary, and it's also a PITA to reset
As an added Chineseoated bonus, the instructions are just plain incorrect. Whoever wrote them has "no idea."
Wiki:
Leak-down tester - Wikipedia
So "whut be" de plan? Well easy, I think. The basics are all there.....a gauge(s), fittings, regulator, nice box, etc
You don't REALLY need two gauges, you really only need one on the cylinder side of the orifice. So the plan IS to attempt to duplicate the .040" orifice "somewhat" remove and plug the port for the 100psi gauge and then move THAT gauge to the cylinder side, leaving the "calibrated" gauge on the shelf "somewhere."
Then the 100psi gauge will read "reciprical" IE you set it unconnected for 100, then 80psi would be 20%, 40 psi would be 60% leakeage, etc. Of course it's relative
I actually built one years ago, but the fittings, gauge, and regulator have been used for "other stuff."
I think I'll search around and see if I can BUY an actual orifice, Wiki says:
"In the United States, FAA specifications[1] state that engines up to 1,000 cu in (16 L) engine displacement require an 0.040 in (1.0 mm) orifice diameter, 0.250 in (6.4 mm) long, 60-degree approach angle. The input pressure is set for 80 psi (550 kPa), and 60 psi (410 kPa) minimum cylinder pressure is the accepted standard."
Got that? Neither do I LMAO
From the Wiki page, even tho they mention 80psi, this seems to be set for 100
