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Thread: manometer build.
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30th Jan 2022, 08:40 AM #1Banned
- Join Date
- Sep 2021
- Location
- Adelaide
- Age
- 73
- Posts
- 117
manometer build.
i have vacuum gauges, but don't particularly like them so i thought i'd try using a manometer. first off i just used a length of looped tube, didn't like that at all, the fluid rose and fell too quickly and if the syncing was too far out it could easily suck the fluid into the inlet tract, so I built a better mouse trap, actually two.
The first one was just a try and see, it worked great so I made a better one. This one uses two acrylic tubes clamped between two, two piece wooden platforms, the platforms have a neoprene gasket between and sit top and bottom of the acrylic tubes, clamped by use of three lengths of all thread. The two tubes are joined at the bottom by short 6mm tube. to connect to the inlet tracts, a long length of 6mm tube is connected at the top of each tube. into each I inserted a Delrin jet I made with a .8mm hole.
It works well, the rise and fall of fluid is slow and steady and because there isn't enough fluid to fill one tube, the fluid can't enter the inlet tract. you can do the same with two coke bottles, but I like tools that look ok as well as work ok.
There was no way of connecting the manometer to the manifolds, so I drilled both and pressed a small tube in place. this was the first rebuild. I didn't like the colour, so I stripped it, repainted it black and put it back together. I was also using the original BS38 carbs but they have since been replaced with VM34 round slides.
Here's a couple of videos, the first is the first startup after the first rebuild, before syncing. The second is of the manometer in use. The sound is a bit odd, sounds like the motor is under water. This is the first manometer I built, the acrylic tubes stoppered by rubber chair caps.
These motors vibrate (360 degree twin), I had to tie it to the bench grinder to stop the stand I made from walking its way around the workshop.
https://www.youtube.com/watch?v=qm2jBGDRfPY
https://www.youtube.com/watch?v=SWPGzy3BzCM
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30th Jan 2022, 10:47 AM #2Member: Blue and white apron brigade
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 7,188
Nice.
You can add a few drop of food dye colour to the water to improve the readability.
I used a red/orange for mine.
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