Building a syncing tool

[Constant Mesh]

For those who have considered making a simple U-tube manometer or a 4-port tube manometer for syncing their engine I'd recommend the following air flow restrictors be installed in the tubes.

https://www.motionpro.com/motorcycle/partno/08-0426/

These guys really tame the manometer and make it very usable.

Also I've seen some designs which use a PVC pipe reservoir in each tube above the liquid column for containing the liquid just in case one of the tubes is inadvertently disconnected from the engine. With these flow restrictors the pipe reservors are not necessary. The orifice is so tiny that only minute amounts of liquid would ever pass through to the engine.

The orifice diameter is less than 1/64". The overall diameter of the restrictor is 3/16".

 

[FJRGuy]

Nice Find! Unfortunately, I don't think I can get them sent here in time for our Tech Day.

edit: And they don't ship to Canada! I'll see if I can find something similar locally.

I assume they could just be inserted into 3/16 CTS vinyl tubing enough to allow for a barbed fitting after

Thanks CM you are a great resource! :clapping:

 

[Constant Mesh]

On my 4-tube manometer I used 3/16" ID x 5/16" OD clear vinyl tubing. At the end which attaches to the engine I included a short piece of rubber hose on each tube. I inserted a flow orifice in each rubber hose. I attached the bottom end of the vinyl tubes to two of these guys.

https://www.dormanproducts.com/p-3296-47315.aspx

I included these so that I could connect all four tubes together -or- split them into two generic U-tube manometers.

I use water for the manometer fluid -- it flows more quickly than oil. You can include a few drops of bleach to control creature growth in the water -or- just replace the water periodically. There are no water pulsations with these orifices.