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What rpm do sea water pumps need to be spun?

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Old 08-25-2017, 09:41 PM
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Default What rpm do sea water pumps need to be spun?

MERCRUISER SEA WATER PUMP 46-807151A9 BILLET ALUMINUM HSG AND SERPENTINE PULLEY | eBay

That style Merc pump? Thinking of driving with 4 rib AC pulley, I can math the pulley sizes and engine rpm to figure out what it would be spinning but dont know what "normal" is
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Old 08-25-2017, 09:53 PM
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i think they run pretty close to 1 to 1 ratio.
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Old 08-26-2017, 12:08 PM
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1 to 1

Just saying that's a GLM parts and in the marine world dealing with many parts daily -- many in the industry call GLM = GOOD LUCK MARINE pure CHINA made parts.
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Old 08-26-2017, 01:16 PM
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Seems that all raw pumps take about the same size pulley, which is smaller than the crank pulley that drives them. Which means they are spun a lil faster than crank rpm. Then there is the direct drive type which, obviously runs at crank rpm. Some alpha vert shafts run a little slower than crankshaft rpm and they are the smallest pumps with least vanes that feed v8 engines. So a pulley the size of the crank pulley would be the upper limit in diameter. I wouldn't go much smaller than what the oem people use. Might spin it too fast.
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Old 08-26-2017, 05:28 PM
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Quote:
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1 to 1

Just saying that's a GLM parts and in the marine world dealing with many parts daily -- many in the industry call GLM = GOOD LUCK MARINE pure CHINA made parts.
****. Looked like a simple deal not hard to screw up. Should I take it apart when I get them and use real bearings? I liked the bolt on pulley (I could have another diameter made if I needed to change ratios) and the 5 thru bolts for the housing gave me an easy place to mount the face to a bracket to bolt to engine block. Ordered the two when I was typing the original post :/ Anything else equivalent?
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Old 08-26-2017, 05:52 PM
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Unable to say anything about the quality but there offering a similar item as Merc (aluminum) or Hardin Marine (stainless). Its not like its hard to make one with a CNC machine. Everything else is simple seals.
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Old 08-27-2017, 12:42 AM
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Unable to say anything about the quality but there offering a similar item as Merc (aluminum) or Hardin Marine (stainless). Its not like its hard to make one with a CNC machine. Everything else is simple seals.
Merc has something like that? Have a part number?
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Old 08-27-2017, 12:44 AM
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Or are you meaning this? MerCruiser Sea Water Pump/Pulley Serpentine Belt, Replaces 46-807151A9 - EMP | eBay
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Old 08-27-2017, 07:48 AM
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Yes like that
Genuine Mercury & Mercruiser parts. Sea Water Pump
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Old 08-27-2017, 08:54 AM
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That doesnt have the bolt on pulley
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