Tech Video: New Street Demon Carburetor Makes Installation Simple

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What would be the best carberator to use on a stock Rover 3. I have installed a stock Buick 4 barrel manifold. Running an automatic trans. I would prefer something that bolted directly to the manifold without the use of any adapter plate. Jackson I’m using the Edelbrock cfm carb on my 3. Don’t know if this is the same layout as your stock Buick one.

Carburetor Fuel Inlet Lines & Fittings

I am building a Chevy Vega. When completed, it should weigh about 2, pounds, driver included. It is equipped with a R4 trans and 4. I plan on using a cfm carb with an electric choke. Should I go with vacuum or mechanical secondaries?

Apr 12,  · Just thought I’de share my thoughts about this new carb since there seems to be little info on it out there so far. Demon Fuel Systems** Street Demon – Ball Burnished Aluminum.

All of the major tuning aspects are found in the upper air horn casting, including the replaceable metering rods, and both the primary and secondary jets. The idle mixture screws are conventionally located in the baseplate. The center casting is the float bowl, and it is available in an aerospace composite phenolic material, reminiscent of the classic Carter Thermo-Quad carburetor, said to keep fuel temperatures about 20 degrees cooler than an all-metal carb, or the more typical aluminum construction.

Given the basic configuration and shape, as well as the availability of a composite center body, comparisons to the old Carter Thermo-Quad are obligatory. Like the TQ, the primary barrels feature triple venturi for a very amplified fuel signal—hastening response and improving efficiency. Like the TQ, the secondary side adds the biggest share of the airflow. Secondary airflow is controlled via an adjustable spring-loaded secondary air door, as pioneered by the Carter AVS and TQ carburetors.

Throttle/Carburetor Linkage, Choke Kits & Components

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OK, first thats a total contradiction. The AOD will be a four speed trans and I didn’t think the 83 trucks had it but I’m not a guru on these or anything. Assuming that you have a three speed trans there should be a vacuum hose that goes from manifold vacuum down to the pass side of the trans close to where the crossmember mount is. There’ll be a vacuum modulator there and that’s what causes early part throttle upshifts on these.

Basically the modulator bleeds off internal trans pressure which then allows the governor to move easier and you get earlier upshifts. This assumption is kinda backed up by the delayed shift you mention. Without vacuum on the modulator the three-speeds would act like you’ve got the throttle wide open. To the point of burning up the trans in short order. I suppose there is one possible way of getting and AOD to shift late. If you can pull the linkage forward then try to rig a spring to hold it forward and see what you get.

Personally I think you got a three speed and that linkage is for kickdown only and shouldn’t follow the throttle like an AOD must. Kickdowns usually only touch the throttle arm above 50 percent throttle and have to get almost all the way to WOT before the trans will kickdown.

What port do you put the vacuum advance vacuum hose on the holley carb?

Car Year, Make, Model: The 18 years before that I have not had the problem. In answer to other questions: I have a Holley S carburetor. That is a carb that is designed with the vacuum hookup to provide the manifold referencing.

Nov 18,  · There were a number of cars and light trucks made w/AODs and carbs – check junkyard – you’ll have to look at the link hookup on your specific carb, otherwise.

This will minimize the chance of producing metal chip particles. If a hacksaw must be used, then metal chips must be removed. During the fuel line installation, DO NOT allow any foreign particles to enter the fuel lines, which could then cause flooding and may result in a fire. Keep the fuel line away from the EGR valve if equipped on the intake manifold. In all cases where the fuel line has been cut, it is essential that it be clean to ensure that no metal particles enter the fuel bowl after the new carburetor installation.

Remove the fuel line at the pump and blow the line clean with compressed air. DO NOT use the procedure where the coil wire is disconnected, the engine cranked for a few revolutions, and the fuel collected in a container.

Demon Carbs & More

Vacuum advance on a question Hi there, If I read your story correctly, That is almost 25 degrees of dizzy timing from just the vacuum advance. Sounds like a lot. Do you have an adjustable vacuum can? It is adjusted from an allen wrench put into the vacuum hole. I would say under 15 degrees vacuum advance is more normal, but every engine is different.

 · Buy a Mercury Comet Carburetor at discount prices. Choose top quality brands Edelbrock, Holley, ://

The number one and two reasons for tuning errors are improper linkage installations and over tightened linkage nut, causing a binding in linkage assembly. Do not depend on the factory delivered settings. Check them before the carb is installed. All settings are done with choke disengaged or warmed up so that the choke is fully opened and disengaged. This is done on automatic choke carburetors by first opening the choke butterfly by hand and inserting a wood block or wedge of some kind to hold open while the linkage is cycled linkage operated through its full movement to clear the choke cam.

You will hear a metallic click as the cam is released. You can check the fast Idle screw under the choke assembly to confirm that it is not in contact with the choke fast idle cam.

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First off, make sure the correct size, cfm carburetor is installed on the engine and be sure the idle mixture screws are properly adjusted see page 6 of the Owner’s Manual. You can always make your carburetor leaner, but this will not always improve gas mileage. Since every engine is different, there is no way of knowing how much of an affect leaning down the carburetor will have on your engine.

You can refer to your carburetor owners manual and the calibration chart inside to lean down the carb. Start off light, but keep an eye on the plugs to make sure you aren’t taking it too lean.

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Slant Six Tuneup Tips

I had an Edelbrock Q-Jet on there before. I rebuilt the Q-Jet but it never ran right. Only one side would respond to mixture adjustments and I could never adjust the idle down past when warm. I wasn’t really happy with the dash pot choke either. I hope my info helps someone with their install or decision. Putting the new carb on and getting dialed:

 · Again I strongly recommend the Barry Grant Road Demon , Vacuum Secondary, w/ electric choke; should cost just under $ (very close in price to the Edelbrock Performer carb). Make sure that whatever carb you are ordering that it comes with the hookup for your specific transmission kickdown

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CARBURETOR VACUUM LINES 101


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