Re: Bendix Treadle Vac Study- Serioius Business!!
Posted by Kevin AZ On 2010/12/4 17:08:27
All,
How does one properly identify models of these Treadle Vacs by Bendix? With all the 'conversation' going on within the forum, I decided to try and look further into the general situation myself too. I found some original Bendix literature from May 1957 through February 1958 and it covers all American marques as far as I can tell. It collectively is a tidy sum of pages and the more I go through it the more questions I seem to have. How does one tell if they have a poppet valve, hydraulic reaction or a slide valve type of BTV? The 'back-up' treadle vac I have out in the garage (removed from my '55 Patrician parts car)looks a bit differently on the outside them the unit I had rebuilt and is now in my 400. Further, given that partial failure I had with my BTV several months ago, I wonder how a technician would readily ID particular BTV units? The unit on my work bench has NO visible serial numbers that I can find.
Of particular interest to me right now is the compensator valve issue. As I look at the literature, the BTV units I've listed above indicate that there are (2) different part numbers for compensator valves. The slide valve & hydraulic types carry a part number of 376177 for the valve, the poppet valve has a part number of 374915.
I also find interesting that Bendix indicates that (2) separate BTV unit part numbers for 1955 Packards. They break out "early" & "late". The early BTV is part number 377141 & the late BTV is 377529. What makes one early & the other late. Is there a way to make such a determination by way of VIN's ? I just don't know!
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How does one properly identify models of these Treadle Vacs by Bendix? With all the 'conversation' going on within the forum, I decided to try and look further into the general situation myself too. I found some original Bendix literature from May 1957 through February 1958 and it covers all American marques as far as I can tell. It collectively is a tidy sum of pages and the more I go through it the more questions I seem to have. How does one tell if they have a poppet valve, hydraulic reaction or a slide valve type of BTV? The 'back-up' treadle vac I have out in the garage (removed from my '55 Patrician parts car)looks a bit differently on the outside them the unit I had rebuilt and is now in my 400. Further, given that partial failure I had with my BTV several months ago, I wonder how a technician would readily ID particular BTV units? The unit on my work bench has NO visible serial numbers that I can find.
Of particular interest to me right now is the compensator valve issue. As I look at the literature, the BTV units I've listed above indicate that there are (2) different part numbers for compensator valves. The slide valve & hydraulic types carry a part number of 376177 for the valve, the poppet valve has a part number of 374915.
I also find interesting that Bendix indicates that (2) separate BTV unit part numbers for 1955 Packards. They break out "early" & "late". The early BTV is part number 377141 & the late BTV is 377529. What makes one early & the other late. Is there a way to make such a determination by way of VIN's ? I just don't know!
Attach file:
(174.61 KB)
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