VOES Question
Thread Starter
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Road Master
Joined: May 2014
Posts: 827
Likes: 59
From: Canada
VOES Question
Installing a used VOES, my EFI to Carb conversion.
Have tested the VOES using vac pump and Ohm meter.
It switches as it supposed to.
But, vac is not held.
If I pump it'll switch, soon as I stop pumping vac falls to zero and VOES switches back off.
Is that the way it's supposed to work?
Have tested the VOES using vac pump and Ohm meter.
It switches as it supposed to.
But, vac is not held.
If I pump it'll switch, soon as I stop pumping vac falls to zero and VOES switches back off.
Is that the way it's supposed to work?
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,199
Likes: 3,087
From: NW AR
I think it has a leak. It is a switch set at a specific vacuum pressure. When you pump it, it it switches, but when you stop pumping, assuming that your pump has no leaks and can hold pressure, then it should maintain that pressure. If you plug a hose and pull a vacuum on it, it holds when you stop pumping, right? If that's how your pump is, I would get another switch.
Vacuum is higher at idle, it is created in the intake manifold or carb by the butterfly or slide being closed..as the butterfly or slide opens (higher RPMs) equals less vacuum due to less restriction. The VOES is pulled on at idle retarding timing and at about 1600 (I think) rpms it is released to full timing advance, works the same as a vacuum advance on a cars distributor. I'm guessing it needs to bleed off to allow the switch to release. Is it not working or causing a problem?
Thread Starter
|
Road Master
Joined: May 2014
Posts: 827
Likes: 59
From: Canada
Vacuum is higher at idle, it is created in the intake manifold or carb by the butterfly or slide being closed..as the butterfly or slide opens (higher RPMs) equals less vacuum due to less restriction. The VOES is pulled on at idle retarding timing and at about 1600 (I think) rpms it is released to full timing advance, works the same as a vacuum advance on a cars distributor. I'm guessing it needs to bleed off to allow the switch to release. Is it not working or causing a problem?
New installation.
Testing it to see if it is functioning properly.
I'm thinking it isn't.
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I know the electrical connection is in a bad spot, but you can plug and unplug this connection and the idle will change, lower with it unplugged... if no change you are probably looking at a bad VOES. Thinking about this it probably stands to reason that it needs to hold vacuum at all times or it would cause a leak, with all the bad running issues related. I think I would try a new one.
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