Looking for the biggest air compressor that will run on 110v. Is there a 40-50 gallon compressor that is 110v?

That might be hard to find. Maybe consider getting a second separate tank and plumb it into the system. Don't get an oilless compressor is my suggestion.

Northern tool sells a 26 Gallon, 120V.

http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200361567_200361567

Listen to Ron... do not get an oilless compressor.

Hey Tim, do ya know where VanCleve (VanCleave?) is?

Sears sells a 33 gallon craftsman. I have this compressor, Besides being loud and not keeping up it's a nice compressor. lol. I also think you should avoid oilless, they're o.k. for small jobs only, and you have to leave the shop when they are airing up, louuud.

http://reviews.ebay.com/Air-compressors-electric-for-home-shops-A-primer_W0QQugidZ10000000002309894

Check out the Ingersoll compressors. I have a 26gal verticle with a cast iron pump. Does 5-6cfm @90psi and is so quiet you can have a normal conversation next to it while it's running. Also it's rated at a 100% duty cycle. (Most consumer compressors are much lower.)
Not cheap ~$650 delivered but worth it. Check out the on-line toolguys. Here's one..

http://www.aircompressorsdirect.com/Ingersoll-Rand-SS3R2-GM/p683.html

What Doug said. That's a nicer machine than the cheapies and you can set up a storage tank to get the extra volume.

Schurkey's ebay guide is well worth reading if you're interested in getting a compressor.

Don't be fooled by the horsepower claims, they're hogwash. About one horsepower is all you're getting out of a 110 outlet.

Listen to Ron... do not get an oilless compressor.

Hey Tim, do ya know where VanCleve (VanCleave?) is?

Stay away from the oilless compressor. I forgot to turn off my air compressor (oilless) one time. It leaked down and fired off at about 1AM :mad: and it is right under our bedroom.

http://reviews.ebay.com/Air-compressors-electric-for-home-shops-A-primer_W0QQugidZ10000000002309894

Schurkey - this is a great source of compressor info. :thumbsup:

The largest 110v air compressors are about 2hp, and will deliver around 5cfm. You can't measure an air compressor's worth by the tank size anymore than you measure the performance of a car by the size of its gas tank. A Chevette with a 100 gallon gas tank is still no match for a SS454 Chevelle with a 20 gallon gas tank, and no 110v air compressor, no matter how large a tank you put on it will perform like a 5hp or 7.5hp 220v compressor.
If you really want to get work done with a small 110v unit, you can add an external tank like Bow_Tied suggested. You could put a 1000 gallon tank on a small 110v compressor, let it run all week to fill it, and use it on Saturday. If the little compressor didn't burn itself up trying to fill the tank, it might work.
But, if you want real work done, get something larger. Look at running HP ratings and CFM ratings and forget about tank size.
A 5hp compressor with a 60 gallon tank will kick butt on a 3hp compressor with a 100 gallon tank all day.

If you have power constraints you should probably make sure that you have a dedicated 20A circuit for a 110v unit.

How would you plumb in an extra storage tank?Iv got a 26 gal 120volt that id like get a little more usefullness from.

I started out with a 110 volt when I restored my car. It didn't take me very long to bring it back and exchange it for a 220 volt. I was able to figure out easy enough how to wire an outlet for the 220. Don't wast your money on any 110 compressor, unless you don't plan on running most air tools for any length of time.