Manual or Electric choke.
Thread Starter
Navigator
Joined: Jan 2006
Posts: 9
Likes: 0
From: Longwood FL
Manual or Electric choke.
I am planning on replacing my quadrajet on my 78 L48 and am debating if I should get an electric choke model or just go with a manual. I am looking at the Edelbrock 1405 or 1406.
I was interested in some pros and cons.
If I go with the Electric choke what is a good power source to hook it up to?
Thanks
I was interested in some pros and cons.
If I go with the Electric choke what is a good power source to hook it up to?
Thanks
Burning Brakes
Joined: Sep 2005
Posts: 1,078
Likes: 0
From: Santee CA
Originally Posted by bsternfl
I am planning on replacing my quadrajet on my 78 L48 and am debating if I should get an electric choke model or just go with a manual. I am looking at the Edelbrock 1405 or 1406.
I was interested in some pros and cons.
If I go with the Electric choke what is a good power source to hook it up to?
Thanks
I was interested in some pros and cons.
If I go with the Electric choke what is a good power source to hook it up to?
Thanks
Also, another problem I've seen raised in previous posts is clearance with drop base air cleaners...A lot of them won't clear the electric chokes. Again, this is also a consideration if you're going to change to a different intake manifold, as many of them sit higher than the stock intake does, requiring either a change in the hood or a change to a drop base air cleaner.
Food for thought...
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by Sprzout
Someone correct me if I'm wrong, but manual chokes usually need an outlet that comes through the intake manifold to heat up the bimetal choke spring. A lot of the newer intake manifolds do away with this little "port", so if you're planning on changing the manifold anytime soon, this may be a consideration.
Food for thought...
Food for thought...
Safety Car
Joined: Dec 2004
Posts: 4,071
Likes: 0
From: San Diego CA
The real question here is why are you replacing a q-jet with a carter copy? o_O
It'd be more cost effective to send your q-jet to lars, than buying a new Edelbrock "performer"
For electric choke hook up, generally you hook it right up to the alternator.
It'd be more cost effective to send your q-jet to lars, than buying a new Edelbrock "performer"
For electric choke hook up, generally you hook it right up to the alternator.
Burning Brakes
Joined: Sep 2005
Posts: 1,078
Likes: 0
From: Santee CA
Originally Posted by bobs77vet
did you mistype/misspeak here???? manual chokes don't have any bimetal choke springs etc....you and the cable control everything
I know there's an arrow that's pointing to a part that's currently disconnected that attaches to the secondaries.
The little box below it that the previous owner painted orange has a bimetal spring in it, which is attached to a metal rod (painted orange in the picture) and which is in turn connected to a bracket going up to an air valve on the carburetor.
My understanding is that this spring feeds heat from the right hand side of the car, and that in turn is controlled by the heat riser that comes from the bottom of the exhaust manifold. The heat riser also has a bimetal spring that, from my understanding of the mechanics, helps to push heat up to the bimetal spring that's attached to the metal rod that's attached to the carburetor...And the shin bone's connected to the ankle bone.
If I'm wrong, please correct me, but please tell me what the bimetal spring in the box that's connected to the carburetor does...
Le Mans Master
Joined: Feb 2006
Posts: 7,582
Likes: 1
From: In The Hardwoods Up North
That bi-metal spring operates the choke, when spring is cold it pulls the choke on when it heats up the spring pulls the choke open.. there is also another bi-metal spring on the heat riser on the exhaust manifold that resticts the exhaust flow on one side of the motor and causes hot exhaust to pass thru the intake to warm the the bottom of the carb on cold start up.. after it warms up the spring unwinds and opens that side of the exhaust back up..
Last edited by 78SA; Feb 17, 2006 at 10:42 PM.
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NCM Grand Opening Veteran
Joined: Sep 2005
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From: South of giving a damn
St. Jude Donor '11, '17
Manual choke has a cable that is driver controlled. The other types incled the usual heat activated Q-jet choke & the electric choke.
You don't mention where you live, if it's warm, then the hell with the choke. Pump the carb & feather the carb until the idle holds, let the motor warm up & drive.
You don't mention where you live, if it's warm, then the hell with the choke. Pump the carb & feather the carb until the idle holds, let the motor warm up & drive.
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by Sprzout
[
My understanding is that this spring feeds heat from the right hand side of the car, and that in turn is controlled by the heat riser that comes from the bottom of the exhaust manifold. The heat riser also has a bimetal spring that, from my understanding of the mechanics, helps to push heat up to the bimetal spring that's attached to the metal rod that's attached to the carburetor...And the shin bone's connected to the ankle bone.
If I'm wrong, please correct me, but please tell me what the bimetal spring in the box that's connected to the carburetor does...
My understanding is that this spring feeds heat from the right hand side of the car, and that in turn is controlled by the heat riser that comes from the bottom of the exhaust manifold. The heat riser also has a bimetal spring that, from my understanding of the mechanics, helps to push heat up to the bimetal spring that's attached to the metal rod that's attached to the carburetor...And the shin bone's connected to the ankle bone.
If I'm wrong, please correct me, but please tell me what the bimetal spring in the box that's connected to the carburetor does...
thats bascially how a mechanical choke operates, perhaps we are confusing the definition of a manual choke with a mechanical choke.....that is a mechanical choke you took a picture of and it operates as you describe...the electric choke heats a bimteal spring up with electrical curent....and a manual choke has no spring at all just the butterfly linkage and a cable that the driver operates
Last edited by bobs77vet; Feb 18, 2006 at 04:53 PM.
Drifting
Joined: Dec 2004
Posts: 1,345
Likes: 3
Originally Posted by ratflinger
Manual choke has a cable that is driver controlled. The other types incled the usual heat activated Q-jet choke & the electric choke.
You don't mention where you live, if it's warm, then the hell with the choke. Pump the carb & feather the carb until the idle holds, let the motor warm up & drive.
You don't mention where you live, if it's warm, then the hell with the choke. Pump the carb & feather the carb until the idle holds, let the motor warm up & drive.
I start my car in temps as low as 10˚F with no choke, and I run a fairly wild (Comp Cams Magnum 294S) cam. I milled off the air horn since it is quite restrictive when using the factory (LT-1) drop base air cleaner.
