Spray gun CFM's and air compressors. PLease help!

[broth9640]

Ok so here is my problem. I am almost ready to paint, but I need an air compressor. I have been shopping around and the only ones that will supply the cfm's that my gun requires (13 cfm) are 230V. I am currently renting the house that I live in and there is no 230 in the garage. My question is , can I get away with a compressor that has less cfm's that runs on 115v. Say something like a husky 30gal 2hp with 5.5cfm's at 90 psi? I have a starting line HVLP gun that says. 30psi inlet pressure delivers
10psi air cap pressure at
13 cfm air volume
air inlet 1/4 nps

Or am I screwed?

 

[kevcruiser]

I've painted a couple of cars in my garage using a 5hp/26 gallon compressor. It was the biggest I could find that was somewhat portable and could be plugged in to a regular wall outlet. Though I usually paint fenders/hood/doors separately, it has kept up just fine.

 

[gil12]

hook up two

I looked into this too - it seems that the most cost effective solution is to buy two HF compressors, be careful to plug them into plugs powered by two different 20 amp circuits, and connect the air together before it comes to your gun. Hopefully you can find someone to loan you the second one for a few days.

HF 67501 - is around $110.

Gil
Ventura

 

[fieldsken1]

you are screwed but if you do it slow maybe it will kept up but i would worry about drying between passes. do you have a dryer that plug will work. just run a longer cord

 

[Pin_Head]

Yes, you will be fine even with contiinuous spraying (which nobody does).

5.5 CFM at 90 PSI = 11 CFM@45 PSI = 22CFM@22.5 PSI.

You didn't believe the advice in your other thread? I have done lots of spraying with a 2hp compressor with a HPLV sprayer. It works fine. You need to worry about getting the water out of the air.

 

[Splangy]

Yes, you will be fine even with contiinuous spraying (which nobody does).

5.5 CFM at 90 PSI = 11 CFM@45 PSI = 22CFM@22.5 PSI.

You didn't believe the advice in your other thread? I have done lots of spraying with a 2hp compressor with a HPLV sprayer. It works fine. You need to worry about getting the water out of the air.

He needs 10cfm at the cap, not the inlet of the gun. There's a big difference. An HVLP gun will typically need around 50psi at the inlet to have 10psi at the cap. He may be able to swing it, but I would make sure I did plenty of practice painting with that compressor before shooting the truck.

 

[UZJ40]

do you have a dryer that plug will work. just run a longer cord

Exactly, most laundry rooms are close to the garage. This should work.

 

[Jetboy]

Yes, you will be fine even with contiinuous spraying (which nobody does).

5.5 CFM at 90 PSI = 11 CFM@45 PSI = 22CFM@22.5 PSI.

You didn't believe the advice in your other thread? I have done lots of spraying with a 2hp compressor with a HPLV sprayer. It works fine. You need to worry about getting the water out of the air.

There's not a direct relationship between CFM and PSI such that that conversion would work. It would seem like boyle's law for expansion of gas would mean that air at 3 atm (45psi) would be twice the volume of air at 6atm (90psi), but that doesn't seem to translate well to compressor output. I haven't looked through the formulas enough to really understand why, but in practice it doesn't appear to be the case.

For example most compressors, 5.5cfm at 90ps will output about 7cfm at 45. You can google compressor output to see that this is the case.