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Re: Thermoquad adjustments..............
[Re: Rug_Trucker]
#225786
02/18/09 07:38 PM
02/18/09 07:38 PM
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Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
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The mechanical ramp only lifts them part way, I would imagine to the first step, then as the fuel and air gets flowing it will pull it back down to that step if the secondaries are locked out, it keeps it from getting too rich, if the secondaries are open then again the air flow throught the primaries slows down and needs more fuel so the tree stays up. This is how I reasoned it all out and is not a known fact 
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Thermoquad adjustments..............
[Re: HotRodDave]
#225787
02/18/09 11:53 PM
02/18/09 11:53 PM
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Joined: Jul 2008
Posts: 30,491
Florida STAYcation
dOc …
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,491
Florida STAYcation
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Quote:
The mechanical ramp only lifts them part way, I would imagine to the first step, then as the fuel and air gets flowing it will pull it back down to that step if the secondaries are locked out, it keeps it from getting too rich, if the secondaries are open then again the air flow throught the primaries slows down and needs more fuel so the tree stays up.
This is how I reasoned it all out and is not a known fact
It is a VERY well thought-out carb.
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Re: Thermoquad adjustments..............
[Re: Diplomat360]
#225790
02/19/09 03:24 AM
02/19/09 03:24 AM
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Joined: May 2003
Posts: 1,603
germany
440sat72
top fuel
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top fuel
Joined: May 2003
Posts: 1,603
germany
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Quote:
Quote:
what i would like to know is: what exactly does the spring do? and why does a lighter spring help stabilizing the tree?
The idea here is that this is a fuel mixture enrichment system. If the engine vacuum drops and is NOT enough to pull the step-up piston down into it's bore that allows the spring to push the piston up, thus moving the meetering rods OUT of the primary jets and richening up the mixture.
When running a large cam you will typically get a low engine vacuum reading...with a stock 'strength' spring it may force the piston up even though it does NOT need to be in the up position. As it forces it up, extra fuel is available, the engine picks it up and surges, the vacuum increases, the piston gets sucked into the bore, mixture leans out, then the vacuum drops again as engine RPMs drop and the whole cycle begins over...thus the surging, etc, etc.
What I never understood is the mechanical level which will force the tree up? Why not just rely on the vacuum...???
thanks, now i get the idea.
regarding the springs: no springs in my strip kit, too. but i was wondering wether one could use the spring kit that is available for edelbrock carbs? the have springs with different colors for different tensions ...
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Re: Thermoquad adjustments..............
[Re: 440sat72]
#225791
02/19/09 04:02 AM
02/19/09 04:02 AM
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Joined: Jul 2008
Posts: 30,491
Florida STAYcation
dOc …
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,491
Florida STAYcation
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Quote:
thanks, now i get the idea.
regarding the springs: no springs in my strip kit, too. but i was wondering wether one could use the spring kit that is available for edelbrock carbs? the have springs with different colors for different tensions ...
HOW do the Eddy and TQ springs compare in actual size? .... now to get spring-rates on something like that - you would have to go to a spring manufacturer for that.
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Re: Thermoquad adjustments..............
[Re: 4BBodies]
#225793
03/13/09 03:19 PM
03/13/09 03:19 PM
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Joined: Oct 2005
Posts: 708
Mechanic Falls, Maine
4BBodies
OP
mopar addict
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OP
mopar addict
Joined: Oct 2005
Posts: 708
Mechanic Falls, Maine
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Occasional miss located, my reluctor gap was too tight. I re-set it, and it is running nice now. BRASS feeler gauges this time! The miss is gone, and it seems right there now. I still installed the #1966 rods, and my tree is set where it seems hapoiest, at 1 1/2 turns. Lesson learned..........don't assume the carb is causing the problem, and even if it is, don't assume it is the ONLY problem! Excited to try it out, the snow is finally melting here, and the car seems to want to go! 
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