Cheap Manometer

I made this up tonight after reading a recent thread and took a few pictures of it. There was a link in the thread on how to make it. I modified it a little with parts I had on hand. Instead of the rubber stopper I just used the regular lids and epoxied the tubing in for an airtight container. Filled the bottles up a few inches with some green water. Tried it out tonight and it works great!! Very simple and easy. Here are a few pics.


Post edited by: bkitchen, at: 2007/06/11 21:45

A close up of the lid.

Interesting looking. I built mine from this link , that I found by searching the forums here. Am I looking at your correctly in that the level of fluid (what fluid is that, BTW?) in the bottle will rise/fall, and ultimately be even once sync'd up? How does it do with flutter? I must admin, the one I made flutters badly (Though I understand I could stick some old jets in the tube as restricters).

You have it right EsaPro the water levels will even out. I am just using water with green food coloring in it. There is some flutter but it's not that bad at all. This is the first one I have used so I don't have a lot of experience. I might try some ATF next time. One tube connects the 2 bottles and goes down into the liquid. The others that go to your carbs go just below the cap so it makes it harder to pull the liquid back into the carbs.

Post edited by: bkitchen, at: 2007/06/11 22:08

Post edited by: bkitchen, at: 2007/06/11 22:10

I sure know about pulling the fluid into the carbs! I used 2-stroke oil for its pretty color, viscosity, and no great harm if some gets in the carbs. The first go nearly pulled everything into the left side! I have to build one of these as you show - looks like a great improvement - Thanks!

What conversion factor are you using to convert cm Hg to in H2O? (centimeters of mercury to inches of water or oil or whatever other liquid you decide to use?) I understand how you can use any liquid to observe and adjust the vacuum difference between carbs, but in order to ensure the vacuum is 19 - 24 cm Hg @ 950 -1050 rpm don't you need to do the conversion? I once looked at making a manometer using water, but it appeared that the thing would need to be VERY tall to account for the weight difference between water and mercury. Ed

Why does the actual reading matter? It seems to me that the whole purpose is just to make all the carbs equal, regardless of the actual reading.

I have to agree with Steel. It's just to even them out. And i cn really tell a difference in how it runs after the sync. with this tool.

From what I have read, having the two in sync with each other is the key ingredient. Having them in spec against atmosphere is gravy.