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06-19-2019, 11:31 PM | #1 |
Senior Member
Join Date: May 2010
Location: Santee, California
Posts: 3,505
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Columbia Vacuum Plate
I'm looking for this item, but need advice as to how large the Vacuum holes need to be to meet the shifting requirements of the vacuum cylinder. Any help appreciated.
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06-20-2019, 06:42 AM | #2 |
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Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 1,965
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Re: Columbia Vacuum Plate
Hi Russ,
The vacuum plate connection is 1/4"NPT. You need part number B-49K which has the plate, longer studs and two gaskets. Glenn |
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06-20-2019, 07:53 AM | #3 | |
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Join Date: May 2010
Location: Schooley's Mountain
Posts: 530
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Re: Columbia Vacuum Plate
Quote:
both venturies. There are some plates that only pull from one side. I think they are for gas fed heaters. Ken |
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06-20-2019, 08:44 AM | #4 |
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Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 1,965
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Re: Columbia Vacuum Plate
Hi,
The Columbia is to be shifted with your foot off the gas, i.e., both throttle plates are closed. The vacuum source must be manifold vacuum and not vacuum above the throttle plates. "The driver then takes his foot off the accelerator pedal (to create maximum vacuum) and fully depresses the clutch which completes the shift." Glenn |
06-20-2019, 09:20 AM | #5 |
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Join Date: Jan 2011
Location: Central Ohio
Posts: 5,013
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Re: Columbia Vacuum Plate
If you have a low-vacuum situation, you can also put in a vacuum tank - with a one-way "flapper valve" - such that you store vacuum. This is the same principle that is used on many brake boosters.
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06-20-2019, 02:41 PM | #6 |
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Join Date: May 2010
Location: Columbia, SC
Posts: 1,579
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Re: Columbia Vacuum Plate
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06-20-2019, 06:56 PM | #7 |
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Join Date: Sep 2017
Location: Venetia, Pa.
Posts: 49
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Re: Columbia Vacuum Plate
Where do you fine the vacuum plate with part number B-49K?
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06-20-2019, 09:16 PM | #8 |
Senior Member
Join Date: May 2010
Location: Columbia, SC
Posts: 1,579
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Re: Columbia Vacuum Plate
Columbia Two Speed Parts: http://www.columbiatwospeedparts.com/ |
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