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C4 Corvettes, 1984 - 1996
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A/C cycling

C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

A/C cycling

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Aug 12, 2005 | 03:45 PM

#21

Morley

Drifting

Joined: Mar 2005

Posts: 1,923

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From: GA

Quote:

Originally Posted by 357L98

They work pretty well, but not as well as an electric powered pump. It won't pull quite as low a vacuum, its noisy, and it will really run your compressor hard if you don't have a big one.

I disagree. I just did a 134 retro on the wife's car and used the Harbor Freight pump. It pulled the system down to 30 in/hg in just a minute or two. I let it keep pulling for over an hour and my compressor had no problem out pacing the vacuum pump (7hp 60 gal compressor).

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