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Our shop purchased a vacume oil changer,The vacume is created by hooking air up to it and it blow's across an orfice or venturie deal.Well it don't work worth a hoot!I got curious and hooked my vacume guadge to it to see how much it had when full,only 15 inches,not enough I think.The guadge on it just has a needle stating full or empty.The one we used to have worked great,same setup but different brand.Well what I figure is it needs more vacume,So what I'm thinking is drilling out the venturie nozzle a tad bigger to move more air across it,thus creating more flow/vacume?Any opinion's? Has anyone had any experince with one of these?Any thought's would be great,Tom
