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28th Aug 2019, 07:28 PM #1Most Valued Member
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Micro Petrol Air Compressor "Project Loan Out"
This week i have arranged to pick up this little 3/4th horse power compressor pump and plan on matching it with this Lifan 2.5hp petrol engine as a little portable go anywhere unit fits perfectly in my boot I'm guessing will weigh less than 30-40kg so quiet easy to lift it will be for loaning out to friends and family for whatever they want to do that requires compressed air i do have a small 25L electric compressor but i am cleaning out the shed i have used that one 3 times in 10 years mostly use the bigger compressor for bigger jobs, this little unit will be put together and likely loaned to my cousin who does mechanical work I'll attach 3 meters of hose with a fitting that suits my rattle gun
i loaned out my very first air compressor a small 25L 30L electric and my uncle tipped it over painting a car and kept painting and blew up the machine i think this little Lifan engine has a low oil sensor so i am hopping if it tips over it will shut off
the tank is bare now ready for the pump and engine to go on to it will get a pic tomorrow of tank its a little 30L tank, cost it should cost less than $250 for the whole air compressor the little pump is brand new and the engine will also be new
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29th Aug 2019, 03:41 PM #2Most Valued Member
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Old electric compressor came from a person that lived next to the Nepean River unsure if salt water comes that far up river but some external rust under the paint i am going to remove the paint with some paint stripper than wash it and wire brush off any rust than use the new big air compresdor to spray the tank color undecided yet
Anyone think that a 50cc whipper snipper engine could power that pump or should i keep with the design? I have a lathe to make a pulley or a flywheel adaptor
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29th Aug 2019, 04:12 PM #3Most Valued Member
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You will need a motor with a governor
If you did use a 50cc brush cutter motor, it will do about 6 - 7000 rpm, so assume you set the no load engine speed to 5000 rpm then you need to divide the recommended pump rpm into 5000.
Assume 5000/1440 = a geared down ratio of 3.5 to 1
It will have the power I think, but the engine will die in the r s as the air pressure builds up, you will need a governor or it wont work,
certainly not properly.
cheers, shed
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29th Aug 2019, 04:47 PM #4Most Valued Member
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Shed what does the governer do? Control engine speed? I was thinking about using the throttle control lever that is used on big petrol compressors where a piston pushes the throttle untill the correct psi is reached than it retracts and a spring pulls the throttle lever back they are $15 on ebay minus spring
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29th Aug 2019, 04:55 PM #5Most Valued Member
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29th Aug 2019, 04:57 PM #6Most Valued Member
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I uploaded a picture to last post i think they are pressure regulated via a spring and seal and it moves the cable in return moving the idle automatically
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29th Aug 2019, 05:10 PM #7Most Valued Member
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It might work but i really dont know, there are no tech details in the pic.
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29th Aug 2019, 05:21 PM #8Most Valued Member
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here is the throttle piston
https://www.bosscompressors.com.au/b...control-detail
Here is how i want to set it up
https://youtu.be/WDEzw-HQzVE
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29th Aug 2019, 05:36 PM #9Most Valued Member
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This guy inspired me https://youtu.be/fZVazbgPFUQ
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30th Aug 2019, 03:34 PM #10Most Valued Member
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Tried searching the internet for a Honda G100 GX100 clone last night absolutely everyone sold out could not find one on google i found a Kawasaki clone which i bought but the price went up to over $200 for the engine purchase alone i bought it from a mower place i just need to remove the water pump
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30th Aug 2019, 05:52 PM #11Most Valued Member
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That motor will do nicely, make sure you get your belt ratio right as compressor pumps are not built for drag racing.
Do you know what motor and pulleys were attached to that compressor pump?
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30th Aug 2019, 06:31 PM #12Most Valued Member
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Hey Shed i think old maye on gumtree may have pulled one over on me, i made contact sun/mon he said he had a funeral to goto and wouldnt be back untill friday which is today i made contact with no reply today and the add has been taking down
I feel a bit stupid now after buying the petrol engine so now i am left scratching my head, i grabbed the old direct pump and pulled it a part in desperation as to keep on track with the project what a downer
The old pump will possibly work i have a lathe and grinder, if i ground this mass down than made a pulley for the shaft i think it may work i will have to make a home made fan
Only down side is i dont know the pumps rpm
Feel so bloody gullabile
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30th Aug 2019, 07:55 PM #13
I hope you didn’t just remove the motor armature and make a pulley to fit on the shaft?
That compressor will most likely need the bearing at the other end of the armature shaft, it will be a single sided crank that drives the piston. Removing the support and attaching a pulley will flog the bearing out in next to no time.
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30th Aug 2019, 08:00 PM #14Most Valued Member
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Tried to get a 1hp pump from China they cost USD$30 there but the lady said shipping is very high so that's a bummer
Thanks Droog i have never pulled one of these pumps a part so had no clue about the one sided bearing i will make a face plate up on the lathe if it fits with another bearing inside or outside the face plate
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30th Aug 2019, 08:03 PM #15
Check it first you may be lucky but I suspect not, they are built to a budget.
Looking at similar type direct drive indicates about 1700 rpm
https://www.rolair.com/products/pump...e/pmp11mk137fc
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