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44Dwarf · 2020-02-18T18:12:49Z

Hello All. I've had this old Patraco water brake bike dyno for 20+ years never had time to mess with it. At some point in its life, the heat exchanger was frozen and burst. Most of the plumbing was cut or disconnected as were the wires. I'm struggling to figure out how this worked as it was originally plumbed most of the water would have recirculated in the heat exchanger so how would it add pressure to the inlet side. It looks like as originally designed the water was just sent to drain, No tank. At this point I don't care about measuring the load I just need to put a load on a bike to check the jetting. Normally I go to a good shop but there down waiting for parts and my 2nd choose guy says he's got no time and "it's to cold" My brake has two 3/4 hose barbs on one side one nearest the shaft (Suction I believe) and one closer to the OD (outlet) and then 180 geg on the housing there's a 3/8 fitting with Tee that has a check valve to air (no connection) and a 3/8 hose barb that runs to an adjustable pressure valve hat i think when to the suction side. I've got some pictures but no place to host them currently. So I'm looking for some basic plumbing diagram to give me some load. I read that it needs 70psi on the suction side of the break but not sure on the GPM i'll need. Thanks for the help. 44Dwarf

Help with old water brake motorcycle dyno

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Last Post by 44Dwarf 7 years ago

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44Dwarf

(@44dwarf)

Posts: 13

Member

Topic starter

The longer of the two pipes into the heat exchange goes to the inlet side of the brake (closest to the shaft) judging by the hose length.

The small 3/8 hose looks to have been run from the brake to a 20psi 1/4 pipe bleed valve.

20200217_163800.jpg

Posted : 19/02/2020 11:43 pm

44Dwarf

(@44dwarf)

Posts: 13

Member

Topic starter

Oh hey it there now!

20200217_163750.jpg

Posted : 19/02/2020 11:40 pm

44Dwarf

(@44dwarf)

Posts: 13

Member

Topic starter

No such Box on my page. 🙁 forum must have min post before i'm allowed to add photos.

Posted : 19/02/2020 11:39 pm

Mach_1

(@mach_1)

Posts: 350

Member

Down the bottom of this box , can you see " Attach file"

Screenshot_20200220-073904.png

Posted : 19/02/2020 10:39 pm

Mach_1

(@mach_1)

Posts: 350

Member

Hi 44Dwarf, Welcome to the forum 44Dwarf , you can post pictures directly here on the forum.

Post some pictures on the forum , you can control the inlet , or the outlet or both simultaneously. Do you have any water valve(s) at all that come with the dyno ?

Here is a visual example for plumbing up a water brake dyno on YouTube

Tech Talk Animation on How Water Brakes Work

https://m.youtube.com/watch?v=nSNkB0BXnHM&t=110s

Posted : 19/02/2020 8:05 am

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Help with old water brake motorcycle dyno

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