Cylinder head vacuum test bench

Has anyone used a cylinder head vacuum test bench.

I am going to build one for my head rebuild work I am going to do.

Here is a for sale test bench And how it works

https://youtu.be/8kKNWSjAy9I

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I have all the parts required but my pump creates a much better vacuum than 30 in hg (-1bar). I have a -1 bar vacuum gauge but goes all the way past the -bar to the stop point.

So i will have to look for a gauge that can cope with the higher vacuum level probably 1.5e-6 bar (1.5e-3 mbar).
It is Very simple setup really.

But I would like to know if anyone has any experience of using them.

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if your gauge is reading past 30 inches of vacuum, its broken, that is the absolute max, you can only take so much air out of a space.

Yes very true.
I got my decimal places wrong.
The calibration on the gauge I used must have been off.
I have a couple of of others on order.
1.5e-3 mbar is quite close to zero. So definitely good enough for a vacuum test bench.
It is basically a backing pump for a tuurbomolecular pump that creates the higher vacuum levels.
I don't need 1e-9 mbar like our TOF mass spec instrument we build at work.

We create our own little bit of space in all out instrument.
Lol.


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i will post pictures of mine when i connect it all up.