CC'ing heads... how to get rid of air bubbles?

[bugnut68]

Any tips for getting rid of air bubbles when measuring chamber cc's?  Would vegetable oil work better than water in this instance?  I've got my stuff all set up but when I filled the chamber with water I had a big air bubble that I couldn't get rid of.  Just wondering if there's any tips for doing this correctly.

[Jim Ratto]

I use mix of slovent and ATF. Tip head to coax bubble to hole in plastic disc

[bugnut68]

I use mix of slovent and ATF. Tip head to coax bubble to hole in plastic disc

Do you fill the chamber until the fluid is just to the bottom of the hole in the disc?  That's where I was at last night, and seemed to make the most sense.

[K-Roc]

Rub a little liquid soap on the chamber surface and the valve heads, as well as the inside face of your CC disc, this reduces the suface tension and allows the fluid to move around easier. 

I use disc's with 2 holes, one to put the fluid in the other is where the bubble are coaxed out of while you are filling..

K-Roc,

[kingsburgphil]

I used mineral oil, less problems with the meniscus.

[Phil West]

I use mix of slovent and ATF. Tip head to coax bubble to hole in plastic disc

Do you fill the chamber until the fluid is just to the bottom of the hole in the disc?  That's where I was at last night, and seemed to make the most sense.

The thing I found was just to be consistent chamber to chanber.  I filled until the water was showing just over the base of the hole, then when I pressed down on the disc the water would push up to the exact top of the hole.  The hole worked out to be a very small fraction of a cc anyway.  I followed exactly the same procedure for all 4 chambers so at least I knew I had a good comparison between them all i.e. could get them all the same as each other.  I got bubbles but found that gentle rolling of the head within a few seconds I could get the bubble to hit the hole and out it came.  Hope that helps
Phil

[bugnut68]

I use mix of slovent and ATF. Tip head to coax bubble to hole in plastic disc

Do you fill the chamber until the fluid is just to the bottom of the hole in the disc?  That's where I was at last night, and seemed to make the most sense.

The thing I found was just to be consistent chamber to chanber.  I filled until the water was showing just over the base of the hole, then when I pressed down on the disc the water would push up to the exact top of the hole.  The hole worked out to be a very small fraction of a cc anyway.  I followed exactly the same procedure for all 4 chambers so at least I knew I had a good comparison between them all i.e. could get them all the same as each other.  I got bubbles but found that gentle rolling of the head within a few seconds I could get the bubble to hit the hole and out it came.  Hope that helps
Phil

I just can't figure out what I'm doing wrong.  I tried it six times last night, using either grease, oil or soap on the edge of the disk, tried coating the valves a bit but not the chamber surface, and tried to slowly fill the chamber with water.  I could coax the bubble to the hole in the disk, but it would never disappear or go away, no matter what I did.

[The Ideaman]

Ryan,

What are you filling the chamber with?  Are you using a burette or a 60cc syringe?  For me, the burette was easier to use.

[bugnut68]

Ryan,

What are you filling the chamber with?  Are you using a burette or a 60cc syringe?  For me, the burette was easier to use.

Using a 60cc syringe.  I think I bought the kit fro CIP1.com years ago.  No matter what I do, I absolutely cannot get rid of the air bubble in the chamber... very strange!

[Jim Ratto]

Ryan,

What are you filling the chamber with?  Are you using a burette or a 60cc syringe?  For me, the burette was easier to use.

Using a 60cc syringe.  I think I bought the kit fro CIP1.com years ago.  No matter what I do, I absolutely cannot get rid of the air bubble in the chamber... very strange!

try what Darren suggested above, drill a second hole. I bet a 1mm hole in center will do wonders

[bugnut68]

In retrospect, I didn't follow Darren's directions to the tee... will try again this evening!   Try try again, that's my philosophy. ;-)

[bugnut68]

I tried again following Darren's method last night, though I've yet to drill an additional hole in the disc... no success.  I have no idea what I'm going wrong, but it's looking like I will have to have someone either watch me and point out my mistakes or else have someone do it in a shop.

[Brandon Sinclair]

Did you put a straight edge across the disc-maybe it is not flat.

[bugnut68]

Did you put a straight edge across the disc-maybe it is not flat.

Will check, though I don't have any reason to think it's not flat... we'll see tonight!