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Old 09-15-2010, 11:36 AM   #1
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Need some impact wrench advice

I'm thinking about investing in an electrical impact wrench. I'm restoring a very rusty vehicle and manual wrenches just won't do, even with penetrants and heat.

I've read online that electrical wrenches are bad for "precision"? Does that mean it's bad for matching torque specs?

For air wrenches, do I need a compressed air tank? Is it worth it? How much should I expect to pay?

Also how important is it to match torque specs? I've been told you should just make it as tight as you can (generally). Do impact wrenches indicate this number ever? How do you check it?

Edit:

What does the community think about this one?
http://www.amazon.com/Kawasaki-84001...Impact-Wrench/

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Old 09-15-2010, 01:15 PM   #2
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since its electric it might be ok but i have a cordless kawasaki drill and it doesnt work that good.

and yes if you go the air route you need a compressor for air to operate it. for a decent compressor and gun i would say your looking at $500 - $600 roughly...and thatll do lug nuts and all...

but for $75 or what ever it is it doesnt seem to bad of a deal...

not sure bout your other questions on specs and stuff...im sure someone else will chime in...

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Old 09-15-2010, 01:37 PM   #3
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The electric wrench will get you close. You need a sperate Torque Wrench to achieve the specific torque settings.
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Old 09-15-2010, 01:42 PM   #4
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impact is good for taking off wont get you to a spec torque when putting back on tho.

now if youre in the pit lanes....
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Old 09-15-2010, 02:07 PM   #5
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As said above, electric will do you fine. My advice is buying an impact gun that requires you to plug it in to use it. Rechargeable ones may not be as powerful. I have one in my garage and it's done everything I've needed it to do so far. At school we have the air powered impact gun. It hasn't done anything that I haven't seen mine do yet.

Also as said above, you really only use the impact gun to take nuts off. You should put them back on with a torque wrench so you can achieve the required torque needed to re-tighten the nut or bolt.
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Old 09-15-2010, 04:33 PM   #6
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As others stated it doesn't matter what type you get you will never get an accurate torque when putting bolts back on with them.
Whether you decide to go for an electric or air powered tool just make sure that it has a decent impact torque rating. I rented a Central Pneumatics impact wrench that felt like it couldn't impact its way out of its own box, let alone the bolts that I needed to remove. It turns out that it only had a rating of 250lbs of impact torque

BTW : Impact torque is the amount of force that the hammer applies to the anvil during each impact revolution.

I ended up borrowing one from my brother in law who said that the CP brand tools were "junk", his was an Ingersoll-Rand that provided up to 600lbs of torque and had settings adjustable between 150lbs and 600lbs... needless to say that it took out all the bolts that the other tool couldn't and the ones that were hopelessly stuck.... well just cranked it up to the highest setting and after 10 continuous seconds it torque the heads right off of them.

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