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Does anyone have a gas powered air compressor?

Discussion in 'Garage' started by Ricko1966, Sep 13, 2020.

  1. Ricko1966

    Ricko1966 Full Access Member

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    I need pulley diamensions from a gas powered compressor so I can figure the drive ratio, to build one. Yes I know I'll need to get a 125 psi blow off valve. If you know where to get that that would be helpful also. Thanks
     
  2. wanderinthru

    wanderinthru Full Access Member

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    Don't know if you know anything about air brakes? They have a regulator/ govenor that just open up at 120 pounds, have a check valve of course. They are cheap and pretty reliable when used often, prone to freezing open. Was thinking of building a gas air compressor and that is what I was planning on using.
     
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  3. legopnuematic

    legopnuematic Supporting Member Supporting Member

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    I dont know for certain but I want to say the one on my compressor is about 12 or 14 inches on the pump end, and the engine side is around 3 or 4 inches. Mine cuts off at 185 and back on at 120 psi.
     
  4. Ricko1966

    Ricko1966 Full Access Member

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    When you have a chance sometime would you verify those pulley diamensions.Not take any thing apart or anything but if you think about it hold a tape up to the guard and say yep like 3.5 and 13 or whatever. Thanks. What one do you have? Do you know?
     
  5. 75Monza

    75Monza Full Access Member

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    Pretty easy to do, just need to know the rated RPM of compressor pump and RPM that engine will run best at. Formula is revolutions per minute, RD1, of the drive shaft times the diameter, DD1, of the drive pulley equals the revolutions per minute, Rd1, of the driven shaft times the Diameter, Dd1, of the driven pulley. RD x DD = Rd x Dd or Rd= RD x DD over Dd . You should know Dd ( pump pulley diameter), Rd (pump rpm) and RD (motor rpm), just plug in the numbers and you got your motor pulley.
     
  6. Ricko1966

    Ricko1966 Full Access Member

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    The problem is I do not know what fixed speed the engines run at.I have a pressure washer engine which is factory set to run at its happy speed which I am sure is the same happy speed as the compressor. Yes I can do the math if I know all the variables, I was just hoping someone had one the factory had already done the math on.So does anyone know happy speed on a 5hp briggs horizontal shaft engine fixed speed no throttle control. And does anyone know the happy speed of a 2 cyl gas compressor pump?
     
    Last edited: Sep 15, 2020
  7. wanderinthru

    wanderinthru Full Access Member

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    All of mine are pissed all the time. Grin. Though there is one on my partner's truck. I'll get some measurements.
     
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  8. Ricko1966

    Ricko1966 Full Access Member

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    Thank you.
     
  9. wanderinthru

    wanderinthru Full Access Member

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    The pump pulley is 12 3/4 od, motor is 4 3/8 belt is 3/8. It's a 2 cyl single stage IR with a 160 Honda.
     
  10. Ricko1966

    Ricko1966 Full Access Member

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    Awesome thanks. Forgot I have a Honda Horizontal shaft also, so time to screw things together, thanks again.
     
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  11. wanderinthru

    wanderinthru Full Access Member

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    Now remember dont plumb that thing up with nasty old copper, that will last plumb through the 2nd Coming. You need that fancy dancy stainless weaved up by Navaho high dollar stuff that cost more than the house. Cant have no perfectly functional put together air compressor in the space age.....GRIN.
     
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  12. Ricko1966

    Ricko1966 Full Access Member

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    Last compressor, I used some aeroquip braided power steering hose, just because I had some laying around.I use it instead of braided stainless making oil cooler/ transmission cooler lines. Not as flashy as stainless but will hold more pressure than any transmission or engine can put through it.
     
    Last edited: Sep 15, 2020
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  13. Ricko1966

    Ricko1966 Full Access Member

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    Ready for a blow off valve.What size hole do they thread into, where do you think I should try to buy one?
     
  14. wanderinthru

    wanderinthru Full Access Member

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    Held on by 1/4 or 5/16... if I recall the lines are 1/4 not. A Napa??
     
  15. Ricko1966

    Ricko1966 Full Access Member

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    Thanks
     

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