Re: How do you lean out a ThermoQuad?
[Re: LL340Rag]
#366201
07/04/09 10:54 AM
07/04/09 10:54 AM
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Joined: Jan 2003
Posts: 5,270
Missouri
MY340
master
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master
Joined: Jan 2003
Posts: 5,270
Missouri
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Mixture screws and idle speed need tuned first. Check timing too.
Lowering height of metering rod tree, change to fatter metering rods and smaller jets would be other ways to lean out a TQ.
Adjust air door opening for leaning out secondaries.
Hopefully your o-rings or jetwells aren't leaking.
1970 FE5 Duster 360/904/3.91's SOLD
1973 TB3 SpaceDuster 340/4spd/4.10's SOLD
Moparless for now but when the opportunity is right I'll have another one.
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Re: How do you lean out a ThermoQuad?
[Re: LL340Rag]
#366208
07/06/09 11:45 AM
07/06/09 11:45 AM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
It was just professionally rebuilt so no prob with the carb. It just really needs to be setup for the engine. TKU.
Pro rebuilt ? .... depends on who did it. Some of those carb-shops mix parts up on these like you would not believe.
Running really rich ? ...at what rpm?
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Re: How do you lean out a ThermoQuad?
[Re: LL340Rag]
#366210
07/06/09 02:24 PM
07/06/09 02:24 PM
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Joined: Jan 2003
Posts: 826
Stone Mt, GA.
DEMONSIZZLER
super gas
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super gas
Joined: Jan 2003
Posts: 826
Stone Mt, GA.
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Quote:
My 340 is running so rich I can't even go near it when it's running. Other than the simple 2 screws how do you adjust the mixture to lean out a thermoquad? It's a 6138S if that makes any difference.
Be sure the carb base gasket is an open center spread bore gasket, not a 4 hole gasket.
Also you can bump up the initial timing two degrees and back off the main idle speed to lean the idle circuit.
You can dial-in the idle circuit by using a vacuum gauge on the driver rear port on the base. You need to adjust each idle mix screw for the highest vacuum reading.
There is also a center adjuster slot at the top of the metering rod tree. You can adjust this screw for the highest vacuum reading also, David.
***pic shows best idle speed adjustment before carb installation or at any point that the main idle speed adjustment is unknown on a stock application*** You want only a square showing at the front edge of the primary butterflies on the idle transfer slot. Hole at the top is where the tip of the idle mix screw ends.
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Re: How do you lean out a ThermoQuad?
[Re: DEMONSIZZLER]
#366212
07/06/09 08:35 PM
07/06/09 08:35 PM
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Joined: Jan 2003
Posts: 3,704
MICHIGAN
DynoDave
master
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master
Joined: Jan 2003
Posts: 3,704
MICHIGAN
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Quote:
Quote:
My 340 is running so rich I can't even go near it when it's running. Other than the simple 2 screws how do you adjust the mixture to lean out a thermoquad? It's a 6138S if that makes any difference.
Be sure the carb base gasket is an open center spread bore gasket, not a 4 hole gasket.
Really. I would have thought you would WANT the 4 hole gasket. Why is the open one better, David?
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