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-   -   New Dewalt 55168 Compressor Defective? (http://www.hotrodders.com/forum/new-dewalt-55168-compressor-defective-176782.html)

JOHNCHAP2 04-23-2010 12:32 PM

New Dewalt 55168 Compressor Defective?
 
Just bought a new Dewalt 200PSI 15 gal compressor (5.4 CFM @ 90PSI) to replace my older Husky 8 gal 125PSI (3.7 CFM @ 90PSI) because the older one would not undo many tightened lug nuts. Even with a high torque (580) wrench the new one does not do any better than the older one. Might the new one be somehow defective, or am I expecting too much from the Dewalt? If the Dewalt doesn't do any better than the Husky, then I probably should take it back.

matt167 04-23-2010 06:15 PM

you should have upgraded your impact gun, not the compressor

JOHNCHAP2 04-24-2010 08:47 AM

Upgraded both. Current impact wrench has 580 ft/lbs torque, but still won't loosen many lug nuts.

matt167 04-24-2010 09:22 AM

if you set the regulator to 100 PSI, and it maintains at least 90 PSI at the regulator gauge. then your impact gun is the problem.. lots of the impact guns are over rated, especially the china imports.. it takes a pretty big gun to pull 500+ ft/lbs.. realistic numbers for a 1/2" drive is 3-400 ft/lbs.. don't start seeing 500+ ft/lbs till you get into 3/4" and 1" drive impacts

oldred 04-24-2010 11:58 AM

You are looking in the wrong place for your problem, it is a lack of volume not pressure! However even with that tiny volume you have available an impact should perform better than that, for the first few seconds anyway. You probably have a restriction in the system and if you are using the regulator that came with that little compressor then your problem is probably there. That regulator is sized to flow the small amounts of air that compressor is designed to deliver and was never meant to flow enough air to power an impact wrench, these things are for airing up tires and powering nail guns. Still if you start at the tank and make SURE that NOWHERE along the air line from the tank to the impact wrench (including ALL fittings) there is noting that has less than a 1/4" hole size then it should work, bigger than 1/4" would be even better. If there is even one spot, and it almost certainly will be inside that regulator, that restricts the air flow to less than what 1/4" can flow at 100 PSI then the wrench will starve for air and will not work no matter how much pressure it has, high pressure without enough volume is worthless!

Old Fool 04-27-2010 05:56 AM

Quote:

Originally Posted by oldred
You are looking in the wrong place for your problem, it is a lack of volume not pressure! However even with that tiny volume you have available an impact should perform better than that, for the first few seconds anyway. You probably have a restriction in the system and if you are using the regulator that came with that little compressor then your problem is probably there. That regulator is sized to flow the small amounts of air that compressor is designed to deliver and was never meant to flow enough air to power an impact wrench, these things are for airing up tires and powering nail guns. Still if you start at the tank and make SURE that NOWHERE along the air line from the tank to the impact wrench (including ALL fittings) there is noting that has less than a 1/4" hole size then it should work, bigger than 1/4" would be even better. If there is even one spot, and it almost certainly will be inside that regulator, that restricts the air flow to less than what 1/4" can flow at 100 PSI then the wrench will starve for air and will not work no matter how much pressure it has, high pressure without enough volume is worthless!

Plus One :thumbup:


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