1967 VW Air Compressor Conversion . 'Lucky Lime' .. Dunn Right

[CleanThatPoolTile]

1967 VW Air Compressor Conversion ... 'Lucky Lime' ... Dunn Right Inc. ... Cleaning Pool Tile, in Tucson, Arizona.

Link to video
https://youtu.be/ytiAQqEzgCQ

Cleaning pool tile, in Tucson, Arizona, since 2014. Compressor makes 56 cfm @ 100 psi. 'Volks-Aire' conversion kit from Dunn-Right Inc. The magic is in the cam shaft: 4 cycle, in the front, two cycle, in the back.

[Letterman7]

Interesting conversion, but I question the output.

[CleanThatPoolTile]

Regarding the question of volume. You are right. The volume should be listed at 58 cfm, not 56 cfm.. Visit Dunn Right for further information.

http://www.dunnrightinc.com

[Erik G]

that's cool. how do you use it to clean pool tile?
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[Letterman7]

I don't believe any manufacturer's ratings, especially one that is converting a 4 cycle engine. There's no way that it's putting out a constant 58cfm at 100psi. The cylinders simply don't have the volume or stroke to do it.

[Abscate]

Try as you may, you just can’t get away....

From mathemaaaaaatics.

-Tom Lehrer
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[Letterman7]

[Abscate]

I’m wrong, I dropped a factor of ten in my swag. Looks doable

It looks like the engine uses the two front cylinders as the air source

I’ll assume it’s a 1600cc or 106 cubic inch engine, so 80 cubic inches of air per revolution

A cubic foot is 12x12x12 = 1800 cubic inches

Cylinder pressure of a Vw engine is about 100 psi so I’ll pretend that’s 90 psi

With two cylinders pushing 80 cubic inches air per revolution , you need to spin it at

90 scf * 1800/ 80 CI/ rev = a mere 2000 rpm without losses

So i think 3000 rpm would meet spec

I am humbled
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Blech



Bad math

50 cubic inches for two cylinders so 5000 rpm needed
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[Letterman7]

Even at speed, a cylinder doesn't create full pressure until it's at TDC capped with a spark plug. The amount of air drawn in on each stroke isn't enough to create that much constant PSI as rated.

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[Danny604]

This might be a dumb question. But would it be possible to take a complete engine. replace the generator/alternator with a motor, connecting it to the crank pulley via belt or chain. remove the carb. connect the exhaust to an air tank. And control the motor off a pressure switch.

[typ914]

Figures never lie but somtimes liers figure.

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[oprn]

The whole valve train could be eliminated and pumping efficiency increased dramatically with a re-designed head using very light springs on the intake and poppet type valves on the exhaust.