1964 2bbl carbs/vacuum tree Check out the post below for questions about my vacuum tree. Now I am on the search for pictures of the vacuum tree from 1964 2bbl carbs. I'm trying to get mine "factory" and would like to see what other '64 carb trees look like. Pictures of my setup are a few posts ahead.... Joe ---- Hey everyone, I'm looking for a little help on a part identification. I have attached a picture of my vacuum tree that attaches to the back of my carb on a 1964 2bbl. On the right side in the picture is the PCV valve and it's tubing. On the tree in the plug below the PCV valve, I would like to know what the little square shaped device is. uzzled: It looks like a pressure relief valve. My next question would be was this factory or some "performance enhancement" put on my car in the 70-80's? Thanks! Joe :
You got me Joe I've never seen one of THOSE before.Maybe it's something the previous owner was just using for a plug?o No: Sorry I couldn't be of much help.I've seen some pretty wierd connections before but that is a new one on me.
Looks like a vacuum breaker (like a check valve). But that would be to balance pressure. I'll check the books and see whay I find. Anyone else?
temperature compensator, allows air in as the gas returning thru the pipe heats up. have them attached to the carbs on my tr-6, little metal strip inside warps when heated
Mike D, Would you say it helps performance, or does it work to better the emmissions. If I took it out, what changes would I see? Still don't quite understand the definition. Joe
googled for "tr-6 temperature compensator", and one of the sites that came back states: What exactly are Temperature Compensators? To paraphrase the Haynes 'Zenith-Stromberg CD Carburettor' owners workshop manual: "The temperature compensator (TC) is a rectangular housing with a plastic cover that contains a bi-metallic strip, one end is secured to the housing with a screw or rivet, and an adjusting nut is located part-way along its length. The other end of the strip engages a plastic plunger with a conical end which slides in a cylindrical extension of the housing and thus forms a regulating valve. Changes in temperature causes the bi-metallic strip to flex, moving the plunger in its bore, regulating the annular area around the bore thus controlling the amount of by-pass air that is allowed into the carburettors mixing chamber."
That is good info! But, is it supposed to be there, i.e. is it a stock part? I swear that somewhere in my memory, I have seen one of those on a car before. Something from the '60's GM, maybe it was a Buick?
thats the $64 question to me it looks stock, I'd think that once the motor was warmed up that the compensator begins to open up abit and start letting some air in. If it works like the TR6 (and it really is a T/C), then the clip washer is actually the adjustment for the compensator. If you spin clockwise and/or counterclockwise it adjusts the sensitivity of the metal strip making it either open earlier or later based on the temp. Once warmed up the compensator opens and starts allowing air in which begins to lean the air/fuel mixture out. Did some addt'l searching, found info on a 'HOT IDLE COMPENSATOR': A hot idle compensator passage is provided to supply more air to the manifold under extremely hot idle conditions. When temperatures in the carburator reach a specific level, a bimetal strip causes the valve to open, admitting additional air to the manifold which leans out the mixture, preventing stalling. Picture looks different tho' - can't find one that looks like yours. Hope I'm steering you in the right direction with this
Mike, you have really given some great info. Now I know what it is; I just have to find out if it is factory. My poor engine went through a lot because it seems the previous owners did not care about the car and did really strange things to it. It sounds like it is a helpful device. Here is question #2- Should it be plugged directly into the tree on the carb? Sounds like it from previous posts, but the tree broke, so on the new engine it is in a port on the intake manifold. Should I change it and get it on the carb? Anyone out there have pictures of the vacuum tree on a 1964 300 CI 2bbl? Thanks, Joe
Sorry I missed this post earlier. Went and looked at my car ( non A/C ) and it does not have this part so I went to my factory service manual and............ its called an "airator". Only used on " 2 barrel carb". Searched through the entire text section and can find no reference to what it does but for proof it is a factory part, look in your chassis manual, page 11-47. Appears to be used only on A/C equipped cars with 2 bbl carb. (edit- sorry I see you have a full size Buick, I found this in my Skylark manual)
It's factory. It's correct. Dunno what it does, though. I suspect the 'hot engine at idle leaning theory'. See additional posting at: http://www.v8buick.com/showthread.php?s=&threadid=14068 JMC
