making a dredge |
Colorado Prospector - Gem and mineral prospecting and mining forums > Prospecting, Mineral Collecting and Treasure Hunting Forums > Equipment - Prospecting and Lapidary  |
making a dredge |
 Apr 2 2006, 05:52 PM
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Diggin' In!  Group: Members Posts: 30 Joined: 16-February 04 From: Unionville Missouri 63565 Member No.: 94  |
what size pump would u need to runa 2inor 11/2in and how much water gph :D
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Apr 8 2006, 10:44 AM
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Shovel Buster! Group: Members Posts: 61 Joined: 7-April 06 Member No.: 329 |
I know I'm on the lower end of the scale but I run a homebuilt 2" with a 3/4 hp 4cycle pump. It's 25cc and pumps ~30 gpm with 1" inlet and outlet but the best thing about it, is pump and motor weigh 11lbs. The 4 cycle engine is quiet, economical, and powerful. It makes terrific suction as long as you aren't too deep but most of the time I use it I rarely go over 3/4 throttle and usually run about 1/2 throttle. I know a lot of people will run 2 or 3 hp for a 2 inch but the little 3/4hp can pull a vortex of air down to the nozzle from a foot below the surface in still water. I think it has a lot to do with the venturi which took a few tries to get right but once I perfected my no-clog design I ran all last season without problems.
-------------------- Diesel Digging
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