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Old December 25th, 2015, 07:23 AM
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Default Predator engine on gast vacuum

I building 2 gas powered gast 1550 pump skids. They will be powered by a 79 cc predator engine. Has anyone used this motor on a similar sized pump? What would be best rpm to run engine at for power and best fuel usage?
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Old December 25th, 2015, 10:59 AM
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I like to run my motors above the idle speed so I get good cooling and your in the power band. You need to see what vacuum you get also at a given RPM. I don't have any formulas but I know that when I start them up I tweak them for the conditions of the day. High RPMs don't always lead to higher vacuum.
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Old December 25th, 2015, 01:30 PM
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I will run vacuum pump as close to 1725 rpm as I can. I'm just trying to decide what rpm would be best for engine for enough power and so I don't waste fuel.I then can purchase the pulleys I will need.
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