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Old 07-19-2020, 03:21 PM   #11 (permalink)
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Shoulda been two 'maybes'.

I just inverted the positive numbers. If it's about draw-down rather than throughput it's probably less, or is there even such a thing with a vacuum? Maybe it would be 14.7/8.2 or 0.557Bar? Half atmospheric?
Could be 120 MICRONS vacuum, about 14.6999 psi negative

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Old 07-19-2020, 04:11 PM   #12 (permalink)
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At one time I wanted a Volks-Aire compressor mounted on the transaxle of a tricycle 'shop truck'. Open the tap to make it drivable with an in-line two.

Else a double conversion that had a four-cylinder compressor driven by a windmill.

Vacuum-bagged basalt composites.

edit: Can you move air from a vacuum flask/tank to a compressed air flask/bottle/tank to double dip on the energy expended? This could have implications for home power.
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Old 07-20-2020, 01:02 AM   #13 (permalink)
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At one time I wanted a Volks-Aire compressor mounted on the transaxle of a tricycle 'shop truck'. Open the tap to make it drivable with an in-line two.
Instead of opening the time and wasting compressed air, makes me wonder if it would be worth resorting to the compressing cylinders as somewhat of a supercharger. At least one guy did a similar approach in a Ducati motorcycle with the L2 engine, I just don't remember if the upper or the lower cylinder acted as a supercharger. On a sidenote, another interesting experience could be resorting to the compressed air to provide some sort of air conditioning similar to what is done on airliners with their air-cycling machine powered with bled air from one of the compressors of a turbofan or turboprop.
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Old 07-20-2020, 03:26 AM   #14 (permalink)
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I was just wanting to post this in the Peak Econobox thread about the Scuderi Cycle engine.

It had separated compression and power cylinders with a reservoir in between. Easy Peasy gas/compressed air hybrid. But they spun their wheels in the development process trying to make a proprietary inline four. The same thing that killed Elio.

Anyways, if they'd done the development work on an air-cooled boxer four....
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Old 07-21-2020, 11:15 PM   #15 (permalink)
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But they spun their wheels in the development process trying to make a proprietary inline four. The same thing that killed Elio.
I must confess I don't have the same enthusiasm as you do for the Scuderi cycle, but it would be nice to see it reaching the market one way or another. Well, considering so many ultralight and light sports aircraft are fitted with engines based on the Volkswagen design, it could've been a good starting point for the development of a proprietary Scuderi engine, even though an inline might be easier to fit into most of the modern cars than a boxer is.
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Old 07-22-2020, 12:57 AM   #16 (permalink)
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If I had money to burn, I'd do a development cycle or two (maybe different displacement compression and power cylinder displacements, dual port head with an air bottle where the carb used to be, port injection, etc.) in secret and then see how cheap a license would be.

Cut deal with J-Bugs or EMPI, and step three: Profit.
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Old 07-22-2020, 08:24 PM   #17 (permalink)
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maybe different displacement compression and power cylinder displacements
Trying to get the Atkinson effect?
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Old 07-22-2020, 09:25 PM   #18 (permalink)
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Old 07-22-2020, 09:33 PM   #19 (permalink)
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Mom keeps asking me what I am doing and why.

Is that normal? Is everyone else constantly explaining themselves? She knows that I will tell the story when it fails spectacularly--and she will not want to listen.

Anyway, I usually tell her "Science woman!"

You would think that she would learn to stop asking!
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Old 07-31-2020, 04:26 PM   #20 (permalink)
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DIY vacuum sealing

Having looked long and hard for a jar sealer, I finally found and ordered one, and it is backordered indefinitely, so I tried to find another solution. For some reason people call the water displacement method vacuum sealing.

People are stupid.

If you are unfamiliar with it, you put most of a ziploc bag underwater and have the water squeeze out much of the air. They said that it is better than nothing and they are right, but it is not vacuum sealing, and I thought of it the first time I wanted to get most of the air out of a bag.

Another guy put water in the bag, mostly sealed it, squeezed it upside-down, and sealed it when the last of the water ran out.

I do not know if that is better or worse for foods that you do not mind getting wet, but a channel called Cheerful Craft showed how to turn a syringe and two check valves into a vacuum pump.

The poster says to buy a syringe from a pharmacy.

CVS, Walmart, and Walgreens do not carry syringes.

They say to buy check valves from a pet store. The big pet store in-town does not carry check valves.

I can use Harbor Freight's brake bleeder, but what about the check valve? Well, they have an even shorter video showing a different way to make a pump with built-in check valves:
  1. A big syringe with needle
  2. Hypodermic adapter
  3. Plastic tubing
  4. Retractible ballpoint pen
  5. Long and skinny balloon
  6. Ball bearing
  7. Drill with a small bit
  8. Wire cutters
  9. Hot glue gun
  10. Tape
  1. Drill a hole in the side of the syringe tip
  2. Cut off a 1/2" piece of balloon
  3. Slide the balloon segment over the hole you just drilled.
  4. Tape the fat side of the balloon to the syringe
  5. Remove the spring from the pen and cut a 1/4" piece
  6. Drop the ball bearing into the tip adapter
  7. Drop the piece of spring over the ball bearing.
  8. Insert the needle adapter over the syringe tip, attach to the tube, stab the bag, apply tape, extract air, push down the tape, and retract the needle.

Amazon says they can have this to Mom's house tomorrow. Really? Three and a half hours from Phoenix? This is also the cheapest one this size:
500ml Syringe with 31.5in Plastic Tubing Hose

Here is a $5 10-pack of assorted dispensing needles

Great. Vacuum-sealing bags, but I wanted to seal jars! Do we just drill tiny holes in the lid and apply tape? The same person showed how!
Seriously?! A third variation?!
  1. Syringe
  2. IV drip with roller clamp
  3. Jar with lid
  4. Ball bearing
They get most of what they need from the IV drip. I cannot find many on Amazon, mostly just hydration powders because apparently the cool kids shoot Gatorade, they don't drink it. This one is $7 and ships in 3 days. However, it would repressurize if you disconnect the drip.

He has at least one more video showing a different way to make a check valve and other people have different methods, like the late King of Random, who also made a pump.

I was thinking that I would modify a bike pump, drill a small hole, and use a ball needle and packaging tape, but there must be way to make your own jar sealer!

You could make a vacuum chamber out of plastic pipe just bigger than the mason jar. Set the lid on the jar, but don't screw on the ring [at least all of the way]. Close the chamber, extract the air, and the jar lid will act like a check valve. Let the air back in the chamber, remove the lid, and tighten the lid on the jar.

I looked at twenty different videos and pages and everyone said to use the jar attachment. I started thinking about how easy it must be to make my own and I finally found plans!
  1. Duct tape
  2. 28oz can
  3. 10" inner tube
  4. Harbor Freight transfer pump
  5. Slime tubeless tire valves from AutoZone. AutoZone sells them?!
  6. A 2.75" length of 3" PVC pipe
  1. Drill a hole in the bottom of the can just barely big enough for the tire valve
  2. Soap the valve and push it through the hole until it snaps. Nobody said we needed soap!
  3. Cut a 6" slice of the inner tube
  4. Drop the "Chunk o' pipe" in the can
  5. "Stretch like heck to get one end of the inner tube 2.5" over the open end of the can"
  6. It's tight, don't use lube, just be gentle
  7. Fold the open end of the inner tube over itself and leave a 3/4" ring around the bottom
  8. Secure the inner tube with duct tape
  9. Screw the lid most of the way, lubricate the gasket (silicone?), slide it onto the jar, attach the pump, and pull vacuum.
  10. Release the pressure and remove the adapter


There is no need to make your own hand-operated vacuum pump or modify a bike pump if you can use a transfer pump from Harbor Freight. I do not know what difference it makes for extracting air, but the brake bleeder is brass, which contains lead.

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