Vacuum

[Windshield Doc]

Do all of you guys use vacuum? It seems that I can see a air bubble in my injector. I have to put a lot of pressure to make move so resin can go in. Will a vacuum help?

[Brent Deines]

Every system I have ever seen uses vacuum, the argument always comes back to how much to use and when to use it. Using a vacuum first with the Delta Kits system is a waste of time, but with other systems they claim it is necessary.

Frankly I wouldn't worry about a bubble in the injector as long as you don't have any air in the break when you are finished with the repair.

It's really all about the end result isn't it?

[screenman]

When using most injectors I do not want to see any air bubble. We have found that any air bubble means you do not have enough resin in the injector and this will cause the job to take longer. This is only our experience in carrying out test with various types of systems.

[Brent Deines]

I agree with you screenman, except that with the Delta Kits system you will sometimes see an air bubble in the seal as the air comes to the surface. When you put the injector in the vacuum cycle the air bubble should be evacuated from the seal, but you may see another bubble as more air rises to the surface.

I'm not sure if this is what ttgs is talking about, but I have had this question before, and have experienced it myself so I want to make it clear that if the question is about Delta Kits equipment, it's air in the break that we are concerned with as the air that is removed from the break is supposed to raise to the surface and into the injector.

[screenman]

I think I am not explaining myself well here,the point at which I do not want to see any air in the injector is when the injector is on the pressure cycle. Air can be compressed liquid cannot, so to get the best out of the injector I would assume we do not want air in it when under pressure.

[Brent Deines]

I agree in part, but we have filmed repairs from the inside and when the action is slowed down you can sometimes see that as the air is compressed to the outside of the break, some of it will migrate up the edges and into the seal as even under pressure the air will always follow the path of least resistance. Admittedly it is usually only a tiny bit of air that rises to the surface during the pressure cycle, but it is sometimes enough to create a small air bubble in the seal until the vacuum cycle is initialized.

The other possibility, and probably more likely, is that the seal is not being completely filled with resin prior to installation of the plunger, which can also cause an air bubble to appear in the seal. If that is the case then there is either not enough resin being used, or the resin is not being loaded into the plunger correctly so that the seal is completely filled and with a little resin left over above the seal to replace the air that is removed from the break.

Of course all of this is assuming that we are talking about a Delta Kits injector, which has not yet been established.

The point I keep trying to make is that all that really matters is if the break is completely filled at the completion of the repair. Where the air goes, and when it goes can be debated all day long, but it seems rather pointless if repair is successful.

[Spike]

I have read that one needs to have a certain number of posts to activate the PM facility.
As I need to PM screenman quickly, please forgive these random posts

Mike

[Spike]

Is it warm in here is is it me?
Sincere appologies.......I need to ask screenman about hid training course

Mike

[t4k]

LOL...it's just you!!

[screenman]

Keep going you will get there, or you could just email Delta Kits and Brent will give you my number and email.