OK, ya'll were so helpful for my last question, how about this tech bonanza:



Anyone know what the output (CFPM) of the stock airpump is at say 2000RPM? And, how can the airpump run continuous duty without an oil source (A/C compressors would sieze under those conditions).



Reason I'm asking, is my other hobby is off-roading, and one mod we do to the trucks is to convert the A/C compressor to a air compressor that feeds a 2-5 gallon tank, which can be used for air-tools or airing up tires while on the trail. Problem is, very hot output air, and requires an oiler or internal oil reseviour. The RX-7 air pump seems to have neither of those problems, and is MUCH smaller than any A/C unit, so I wondered if it would be a decent swap (and, you guys are always pulling them and tossing them, so there is a supply of used pumps laying around). Now, I understand that the output is a fraction what an A/C pump puts out, but the air pump would be continuous duty, so run it for several hours while off-roading, and have a nice full tank of 110PSI air ready and waiting.

 

I dontthink the air pump has enough strength to fill a tank. It takes so much PSI to put 110 psi of air into a tank. I DONT KNOW JUST A THOUGHT ! ! ! !

 

Yea I doubt it would work, but maybe someone else knows the exact #s

 

Try it...if it don't work, say it's a supercharger and sell it on eBay! I'm j/k. It seems there's alot of people on there that are doing crap like that, though.

 

I've got 2 I'll sell you.

 

they only put out 2-3psi. you should skip it and get an rx8 one its cheap ($250) and electric



mike

 

Well, the PSI doesn't really matter, we care about CFM, since we put a check valve inline, so even 1 psi will eventually fill a tank, but I assumed that based on the size of the piping (what, about 1 inch) that the total flow volume would be relatively large. If it's even 3-4 CFM, it'll work (most A/C compressors are around 7-8 CFM). There's a boneyard GXL near me, might just have to pull the pump and play with it.



Still, does anyone know how they can run 100% duty cycle, at 5000rpm, without seizing? Anyone ever tear into one and see what's inside? I'm assuming they do little or no compressing, is it just a turbine system to accelerate the air velocity?

 

theres a big plastic blade in there, on an eccentric shaft deal. they acutally dont run 100% duty. over 3500 rpms they just dump the air to the outside



mike

 

i don't understand how you expect to be able to compress the air in a tank to 100psi with this air pump, it's not intended to be used as a compressor, the surge limit will be very low. Using a check valve will not make any difference, if you have 10psi on the other side of the check valve (inside the tank) it will take > 10psi on the pump side of the valve to open the check valve and increase the pressure on the tank side. Meaning, the air pump will need to have a surge limit high enough to reach the pressure you intend to obtain in the tank (higher actually).



unless I'm missing something.

 

The spec on the ACV actuators are .8 - 1.8 psi, so that is all the Air pump will put out. The CFM is extremely low