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Hi,
No, the Free Air Displacement of a vacuum pump will make no difference to the speed of an infusion whatsoever. The only thing that affects the speed of an infusion is the level of vacuum (the vacuum pressure) and since infusions should always be done at 100% vacuum the only problem is whether your vacuum pump is pulling enough vacuum, not whether you need to slow it down.
Check your pump with an accurate gauge. You should be pulling 100% / -1bar. If you've got that (not close but actually reading a full -1bar) then you should be fine.
Best regards, Matt
Matt Statham
Easy Composites / Carbon Mods - Technical Sales
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