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Old 11-02-2009, 06:08 PM
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Just walked to my shop in mine say's 15 amps..

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Last edited by NEW INTERIORS; 11-02-2009 at 06:20 PM.
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Old 11-02-2009, 06:15 PM
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I'm such a noob and sorry for upsetting the hotrodders gang and not doing as I was told... (my bad oldred)
I will continue my research and find a properly powered air compressor. how do you figure the HP to Amp ratio to find out what the true HP is
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Old 11-02-2009, 06:50 PM
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Quote:
Originally Posted by NEW INTERIORS
Just walked to my shop in mine say's 15 amps..
so what is the HP stated and actual?
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Old 11-02-2009, 06:56 PM
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Quote:
Originally Posted by vintagecar
so what is the HP stated and actual?

Mine say's 6hp..
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Old 11-02-2009, 07:28 PM
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That is probably 6 hp rated peak, which is a totally bogus rating.

Vince
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Old 11-02-2009, 07:32 PM
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Quote:
Originally Posted by vintagecar
how do you figure the HP to Amp ratio to find out what the true HP is
I just use my handy dandy Square D motor data slide calculator. The actual calculations are based on the National Electrical Code 430-6.

Vince
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Old 11-02-2009, 07:34 PM
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Quote:
Originally Posted by NEW INTERIORS
Just walked to my shop in mine say's 15 amps..
If your running off 230v that works out to be about 1.5hp.

Vince
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Old 11-02-2009, 07:57 PM
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Quote:
Originally Posted by vintagecar
how do you figure the HP to Amp ratio to find out what the true HP is



Volts X Amps = Watts


746 Watts = 1 HP


But there's a lot of things to consider so it will never be an exact conversion when looking at motor ratings. Basically when you are looking at these single stage compressors with a 60 gallon tank most, if not all, will be 15 Amps or about 3 HP. A real 5 HP motor will be rated at least 21 Amps and can be more and any thing above a 21 Amp rating will have a believable HP rating anyway because then you are talking industrial types. Also the better companies are honest about the power ratings, for example Quincy numbers are believable as are Eaton's but IMHO Eaton has other issues that would cause me to avoid them totally. Ingersoll Rand is a very large company but even their 5 HP and smaller compressors have some very suspicious numbers so I would approach them with caution also. Of all places to find a good compressor the US General 2 stage at Harbor Freight is on sale quite often in your price range. These things are NOT made in China, the pump is from Italy and most of the rest of it is made right here in the USA where it is assembled. I have no first hand experience with these HF compressors but the US General I looked at last year had a USA made motor and electrics and later I discovered that even the tank is US made, it actually looks like a really decent outfit and when on sale they can be bought right! Use one of the weekly E-mail 20% coupons along with the sale price and these things can be bought dirt cheap!


http://www.harborfreight.com/cpi/cta...emnumber=93274


I have not used one of them, in fact I have never even heard one run but they look like a decently built unit and the parts quality looks to be a lot better than the McHome store types.

Those 20% off coupons can be found in a lot of sports and gun magazines also and with one of them that compressor is less than $700! I had not even realized those things could be such a deal until I looked them up just a bit ago, use that coupon when they are on sale in the store and we are talking a 22 Amp (5 true HP) 2 stage 60 gallon outfit for only a very few dollars more than those 3 HP units.


[EDIT] My mistake, it is the 7 1/2 HP compressor that has the Baldor USA made motor on it. Not sure where the 22 AMP 5 HP motor is made but it is an AO Smith brand.

Last edited by oldred; 11-02-2009 at 08:02 PM.
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Old 11-02-2009, 08:04 PM
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Quote:
Originally Posted by 302 Z28
If your running off 230v that works out to be about 1.5hp.

Vince
I'm running 220. I guess you learn something everyday.. No wonder it can't keep up with me !!!! I guess it did pretty good... 15yrs and not sure how many cars I did with it..
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Old 11-03-2009, 07:03 PM
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That harbor freight compressor has some pretty decent specs. I saw a gas powered compressor there the other day that was the us general brand (or whatever brand it was, it was the harbor freight brand) that had a saylor beal 705 pump on it. That or a clone. Also had a kohler engine. Sounds like a pretty good compressor to me.
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Old 11-03-2009, 07:04 PM
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When picking a compressor, Ignore the HP claims and look for one with the most CFM @90 seeing as how 99% of all tools are rated at 90psi. CFM is all that matters with an air compressor, NOT HP.
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