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I planned on going 4-stage, 3 scavenge 1 pressure.
I was speaking with someone at StockCarProducts and they mentioned that a spur gear with 5-stage might pull the same as, say, a gerotor would at 4 stages but they couldn't suggest anything since they are unfamiliar with KAs.
Making these numbers up for sake of conversation but if a KA pulls 10 inHg at 3k rpm and a 4-stage spur gear can only pull 8 inHg before it maxes out then I wouldn't use that and my options would either be adding a stage or looking at different pumps.
Sorry if I am not being clear but I'm asking so I can have a ballpark figure to know when comparing sump vacuum performance. I know some people have set ups in which they use a 3-stage + auxiliary vacuum pump but I would like to avoid that since it adds complexity. ARE's KA kit comes with a 3-stage sump but the Mazworks SR kit is a 4-stage sump, both from ARE, granted they aren't the same engines but this is what is leading me wanting info before I make a decision on which pump.
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