![]() A carb bolted directly to a steel shield is highly prone to vacuum leaks between the carb and the shield.ģ. A hot carb with hot fuel may run very well on cold mornings in Minnesota, but this arrangement does not run well on hot summer nights in Southern California.Ģ. There are several problems with this arrangement:ġ. The hot gasses would heat up a stainless steel plate, and the carb was bolted directly to this stainless plate for good heat transfer. The purpose of this “smiley face hot slot” was to run hot exhaust gasses under the carb to provide fuel pre-heat on cold days. This results in severe exhaust gas ingestion into the intake manifold, external exhaust leaks on the driver’s side of the carb base, and possible carb base damage and engine damage from detonation.Įarly Rochester QuadraJet Carburetor installations (1966-1969) often used a “hot slot” exhaust groove that runs from side-to-side in the intake manifold just forward of the primary throttle bores, popularly known as the “smiley face” manifolds. You may have to do a little fab work to hook up a cheap, readily available solenoid on your carb.Q-Jet Carb Base Gasket Info for “Hot Slot” ManifoldsĪ common mistake when installing a Q-Jet on a 1966-1970 GM V8 is that the “mechanic” uses a 1971 – 1980 carb base gasket. Then switch it off when carb is warm and it's not needed.ĭon't know exactly what type of solenoid will fit your carb. So, you can wire one of these up with a toggle switch. They were designed to keep the idle speed up, when the AC compressor is kicked in. ![]() These were used on lots of engines, in cars that had air conditioning. (3) Install a properly functioning electric idle stop solenoid. (2) Set the idle screw for the hot idle speed you want, then keep the engine running with your accelerator pedal, til it will idle without adding any pedal. (1) Experiment to find the lowest position which will still keep the engine running when cold-IF that setting doesn't give you more hot idle than you can live with. But, if you don't wanna have to open the hood, for adjustments, I suppose there are at least 3 options. ![]() In post #13 of the thread I'll link is a description of how to adjust the idle mixture screws, by a good carb guy.Īs I've probably mentioned, I adjusted the throttle screw for cold idle, then backed it off after the carb/engine warmed up. You'll have to adjust your idle function, with the throttle adjustment screw, and the idle mixture adjustment screws on the front of the carb. Or, in other words, make sure that no part of the choke system will affect the carb function, at all. This can cause an idle which is too high. And make sure the choke high idle mechanism is not holding the primary throttle blades open. :yesĬlick to expand.Make sure the choke flap is held completely open. That's what I did to all TJ's street Pontiacs, here in LA. !/A-Pontiac-1968-1972-Quadrajet-electric-choke-conversion-kit/p/60306004/category=16728003īut, if you won't be driving in cold weather, you may wanna just disconnect or modify the choke linkage so that the choke flap stays completely open at all times. ![]() These cost lots more than the hot air conversions. If you have a hot air style choke, there are cheap electric choke conversions, which will eliminate the heat tubes.Īnd, if your carb uses a divorced choke, there are elec choke conversions which bolt to the carb, rather than the intake. ".How is the choke going to operate if I block off those passages?.Not really wanting to spend money on a carb with a different style choke." This will prevent the the exhaust gases from burning the gasket. ".Does it go on the head or the intake side of the gasket?."
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |