stakeside Posted October 1, 2018 Share Posted October 1, 2018 (edited) Found this vacuum amplifier in my “bone pile” and may use on my Steward tank. This the pot metal version with the brass insert. The brass insert with the orfice came out and there is a small brass ball inside of the camber. What is the purpose of the ball? The orfice has been enlarged and should be #51 drill size. Can I silver solder the hole shut and redrill with a #51 drill? The orfice in the pot metal portion is also enlarged. Will this have to be a #51 orfice also? I attached a portion on the “DB Club Article” for reference. Edited October 1, 2018 by stakeside E (see edit history) Link to comment Share on other sites More sharing options...
PFitz Posted October 1, 2018 Share Posted October 1, 2018 Nice piece of history, but I think they are rare for a reason. I question if it's needed for anything more than using vacuum wipes with a wiper motor that needs some TLC. A good sized vac wiper motor, in good condition, usually just slows a bit but shouldn't quit on a long hill. As for the engine running out of fuel on a long hill, I'd look for causes instead of treating a symptom. With a properly functioning vacuum tank,..... and with a good running motor,... and not lugging the motor up a hill in too-high a gear that requires the gas pedal to be pushed to the floor..... at 4 in/hg on a vacuum gauge, which is below the point where many carb's open their power enrichment circuit for hill climbing,... the vac tank is still producing 2 PSI pressure in the fuel line to the vac tank,... which is what many late 1920s and early 1930s mechanical fuel pumps produced as the low end of acceptable fuel pressure range. Paul 1 Link to comment Share on other sites More sharing options...
hchris Posted October 2, 2018 Share Posted October 2, 2018 Whilst I wouldnt question your reasoning on the necessity of a vac amplifier, in the real world a long hill or even a strong headwind at large throttle openings, is a not uncommon reason for a vac tank not being able to keep up with engine demands. Most of us would probably never encounter this problem as the majority of our motoring is at city speeds on the straight and level; commercial vehicles were a different matter with loads and distances significantly greater often requiring the fitment of a booster. Link to comment Share on other sites More sharing options...
stakeside Posted October 3, 2018 Author Share Posted October 3, 2018 Still need any ideas on rebuilding my booster valve. The orfice has been enlarged in the brass insert and should be #51 drill size. Can I silver solder the hole shut and redrill with a #51 drill? The orfice in the pot metal portion is also enlarged. Will this have to be a #51 orfice also? Link to comment Share on other sites More sharing options...
PFitz Posted October 3, 2018 Share Posted October 3, 2018 You can solder and redrill the stamped plug, as long as you don't get the solder too thick. It's not just the diameter of the finished hole that affects air flow, it's the length of the hole, too. As for the Venturi, the size and location of the narrowest point in relation to the opening that you want to boost the vacuum (pressure drop) from is very rather critical. Without the original drawings you might get the narrowest part the wrong diameter, and/or, in the wrong place. Paul Link to comment Share on other sites More sharing options...
stakeside Posted October 5, 2018 Author Share Posted October 5, 2018 Paul thanks for comments. Is the Venturi in the main body a #51 hole also? I am concerned more of the correct location and lenght of the hole in the main body. As it sets right now the booster is not useable since the hole has been overdrilled. Link to comment Share on other sites More sharing options...
Spinneyhill Posted October 6, 2018 Share Posted October 6, 2018 Looking at the location of the stamped plug (I think that is where it is, where the diagram label #51 hole is pointing) it is immediately above an inlet. Bernoulli's Equation says the static head plus the velocity head (v2/2g) plus the pressure head are a constant. Static head is constant here. Thus by increasing the velocity in the pipe, the pressure of the fluid in the pipe is reduced. If there is an inlet at that point and the lowered pressure is below the ambient pressure in the inlet, fluid will be "sucked" in. The pressure in the inlet can be decreased. So your #51 hole should be short as said and immediately above an inlet, so maximum velocity is at the inlet. Link to comment Share on other sites More sharing options...
PFitz Posted October 6, 2018 Share Posted October 6, 2018 9 hours ago, stakeside said: Paul thanks for comments. Is the Venturi in the main body a #51 hole also? I am concerned more of the correct location and lenght of the hole in the main body. As it sets right now the booster is not useable since the hole has been overdrilled. Sorry, I'm not familiar with what the inner dimensions of the Kingston should be. I've only seen and have measurements of the Stewart Warner booster, which is a very different shape than that Kingston. Paul Link to comment Share on other sites More sharing options...
old car fan Posted October 7, 2018 Share Posted October 7, 2018 (edited) As I told you before,we have all fittings and tanks.this is spoken for at Hershey,if he doesn't come by ,I may let you know. Edited October 7, 2018 by old car fan (see edit history) Link to comment Share on other sites More sharing options...
stakeside Posted October 8, 2018 Author Share Posted October 8, 2018 Thanks for consideration. If still for sale send me a private message. Link to comment Share on other sites More sharing options...
old car fan Posted October 8, 2018 Share Posted October 8, 2018 Have more at home,so if in need no worries Link to comment Share on other sites More sharing options...
ami74 Posted March 13, 2019 Share Posted March 13, 2019 Hello! I need exactly the same fitting for this kingston vacuum pump! I have a 1929 chrysler series 65 business coupe. preferably several pieces, or even the entire tank! I am from Austria, Europe. Please help! Thank you! Link to comment Share on other sites More sharing options...
stakeside Posted March 15, 2019 Author Share Posted March 15, 2019 The size of the orifice is calibrated and very critical. The one I have has been drilled out for some reason. Link to comment Share on other sites More sharing options...
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