This DIY jet pump (aka siphon or venturi) worked so well I decided to re-post it in the performance area.
The jet I used is from a Honda lawnmower engine. Any small engine shop should have a junk carb kicking around to get the jet from. I'm not sure what size hole it is. Very small. Maybe .010".
I used an 1/8 NPT tap on the 1/8" brass T so the hose barb fittings would thread in deeper.
The two smaller hose fittings are 1/4" barbs to 1/8" NPT. The straight one was tapped 7mm x 0.75 for the jet. The 90 is unmodified and screwed into the side of the T and will be the suction line. The larger hose fitting is 5/16" barb to 1/8" NPT. A small section of brake line was cut and pressed into the 5/16" barb. The outside lip of the flare had to be ground slightly to fit into the T.
Sorry I don't have a more scientific method for testing this but I'm quite pleased with the results. Volumes (in the Solo cups) were after 1 minute of flow. With just the jet spraying into a cup, almost one Solo cup was filled after 1 minute of running. With the suction line connected, almost 3 cups were filled. It's drawing in more liquid then is being provided to the venturi.
The jet I used is from a Honda lawnmower engine. Any small engine shop should have a junk carb kicking around to get the jet from. I'm not sure what size hole it is. Very small. Maybe .010".
I used an 1/8 NPT tap on the 1/8" brass T so the hose barb fittings would thread in deeper.
The two smaller hose fittings are 1/4" barbs to 1/8" NPT. The straight one was tapped 7mm x 0.75 for the jet. The 90 is unmodified and screwed into the side of the T and will be the suction line. The larger hose fitting is 5/16" barb to 1/8" NPT. A small section of brake line was cut and pressed into the 5/16" barb. The outside lip of the flare had to be ground slightly to fit into the T.
Sorry I don't have a more scientific method for testing this but I'm quite pleased with the results. Volumes (in the Solo cups) were after 1 minute of flow. With just the jet spraying into a cup, almost one Solo cup was filled after 1 minute of running. With the suction line connected, almost 3 cups were filled. It's drawing in more liquid then is being provided to the venturi.
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