Thermaquad Carb Question.

[woody9512]

   I have my car (71 340 Cuda 4-speed) all back together and I seem to have a small problem. There is a tiny vacuum nipple on the very front of my TQ Carb at the bottom (facing forwards towards the rad) and just slightly on the drivers side of center. I can't seem to find where this vacuum nipple should hook up to I wonder if I could just put a plug in it and hope for the best as for the life of me I can't locate when it should be hooked up to......I can't remember if it was hooked up when I took the car apart or not...
  Any ideas would be much appreciated!!!!
"Tim"

[Bullitt-]

I have a '73 340 w/thermoquad. & I believe that one to be the for the vacum advance on mine

[woody9512]

  I thought of the vacuum advance.....but....on my TQ there is a vacuum nipple right at the back of the carb near the distributer and I thought that that one was actually for the vacuum advance as it was right beside the distributer itself:clueless:
  For some reason the guy who had the car before me.....some 10+++ years ago had a plug in the vacuum advance hose which is attached to the distributer so it was never hooked up while I have had the car.....why he had it plugged I don't know????Any ideas?
   So I've got 2 vacuum nipples on the TQ Carb.....one will be for the vacuum advance on the distributer.....front or back nipple...I'm not sure and I will still have the one left over!!!
"Tim"   

[Bullitt-]

Mine has the same nopple on the rear that is for the Air Cleaner to open a door to let warm air drawn off the manifold. Don't know that the '71 would have this polution equipment. Do you have the OE air cleaner & does it have a vac.pod on it?

[MEK-Dangerfield]

I'm not familiar with the carb., but you can't go wrong plugging it. Vacuum advance, PCV valve, power brakes, it could be any of those, I guess. Many people(me included), don't use a vacuum advance.

  Mike

[miketyler]

I was always told that dist vacuum needs to come from a manifold source. Maybe thats not true? Also, the charcoal canister had at least one line going to the carb.

I am going to a tquad also and was wondering what to do with all those vacuum connections   

[Bullitt-]

1= Vacuum Canister Large hose
2= Vacuum Canister Small hose
3= PCV
4= Vacuum Advance
5=Air Cleaner Vac
6=Choke Pulloff

[Chryco Psycho]

if the vacuum advance is to work correctly it has to be connected to ported vacuum Not Manifold vacuum
 ported vacuum increases with rpm , manifold vacuum is opposite & decreases with increased rpm
 connecting vacuum advance to manifold vacuum will give full advance at idle decrasing with rpm , this will KILL milage power & can cuase the engine to run hot . Which is no big deal unless you actually Want to beat up the GMs

[miketyler]

great info and excellent diagram. This will come in handy when I swap mine over.  I will have to reread my "cooling the engine down" thread. I think it was there someone mentioned making sure it VA was hooked up to manifold source.

Thanks!

[woody9512]

EXCELLENT INFO..............Thanks one & all....

"Tim"

[miketyler]

On a similar note, I'll be putting my 72 Qjet (6319S?) on my Mopar Perfromance MP1 manifiold. What do you guys do for a choke on these? Manual kit?  I hear the original setups are rare and pricey. Not sure they would bolt on to this newer manifild anyway. Are there any later model electronic chokes that could be retrofit?

[Bullitt-]

found the old style
http://www.hoffmanswinnerscircle.com/cat08.htm
looks like it would fit a smallblock M1
 
couldn't find a replacement part for a '72 but the '73 lists a "choke thermostat" at Rockauto
also did a search on the part# they provided 2C1112 & saw it also fit a '77 Chry 400CI so I check Advanced and they list  Borg Warner  part # TH168 Crossover Choke with Electric Assist: NASCAR 
Choke Thermostat/Crossover: CARB. TYPE: C-4; CARB. MODEL: T-Q; CARB. NO: 9077, 9078, 9080, 9101, 9103, 9114, 9119
Warranty: 1 Year Limited Warranty
http://www.partsamerica.com/ProductList.aspx?parttype=274&ptset=A&searchfor=Choke+Thermostat
Which looks like my 73's OE
 

[Aussie Challenger]

On manual transmission vehicles you need ported vac., however on an auto manifold vac. is alright, it gives a bit more go low down and as the rev's come up the vac. advance is needed to be cut back as toooooo much advance means detonation or another hole for the exhaust to exit, usually a piston. This is why pure race car applications don't run vac. advance manual or auto, it is only there for economy. 

[woody9512]

 I'm having a bit of a problem adjusting the idle on my TQ to get it running just right??? I just had rebuilt and hopefully it was done right. My question is which of the two screw's is for what on the front on the carb as seen in the picture by the numbered vacuum nipples??? Turning each one which way will do what to the quality of idle 
Thanks   "Tim"

[Chryco Psycho]

the 2 screws on the front are the idle mix screws , you need to either turn them in until the idle gets worse or turn them out until the idle is as good as it gets& turn it back in until the idle just starts to suffer & back them out until the idle smooths out again