brawler carburetor tuninglolo soetoro and halliburton

Quick Fuel Technology (QFT) ships carburetors only after they have been thoroughly run-tested and adjusted on a typical engine. Place the base on top of the vise and slide the diaphragm through the lower half until it sits flush. Next, the float level adjustment can be checked and adjusted if necessary. Reducing the main jets from 75 to 70 is equal to a 13 percent reduction in flow area. Engine setup is a 72 block zero deck kb flat top bottom end. Carburetor Installation & Tuning Segments. But where is the love for the classic double pumper? Brawler diecast carburetors are machined and assembled by craftsmen right here in the USA. A good carburetor tune can make an engine, while a carburetor thats mistuned can literally break an engine. Heads are stock 429 PI. These days, the talk seems to be all about EFI and fuel injection retrofit kits. The only way a street small block can handle the extra airflow of a larger carb is if the engine is built and cammed to rev over 7000 RPM and the drivetrain is geared with a higher numerical final drive ratio. There is some confusion around this as older tuning stories mention requiring clearance here, but only with the linkage at wide-open throttle (WOT). 2023 Holley Performance Products, Inc. All Rights Reserved. For most street applications, Murphy likes to use the purple spring. Carburetors are amazing mechanical devices. You bring the gumption. If you need assistance, please . was thinking about putting my 1" open on it just to try. curious how much advance they give. These carburetors work hard just as their name implies just raw bare knuckled performance that you can rely on. I just cant see a little bit of vacuum advance fixing this tho. Finally got it running much . Trial-and-error changes to the accelerator pump and/or main jets and/or power valve should eventually sort out the problem. Leave the locking screws for the choke housing cap slightly loose so the choke can be easily readjusted as needed. It took considerable amount of time for tuning and adjusting electric choke. Specs Service Parts Non-Stick Gasket Assortment 4150 Part# BR-67220 $19.19 Qty: Add To Cart Adjustable tapered idle screws for each barrel control how much fuel is pulled into the engine at idle by intake vacuum under the closed throttle plates. If the power valve is too big, it may cause the A/F ratio to run too rich when the engine is under load. This means the power valve will open at 8.5 inches of vacuum. But don't despair if you have a Holley with straight boosters. Vacuum secondary models are adjustable with a turn of a screw, allowing you to adjust the secondary opening rate with out replacing caps or springs. A 10-degree temperature change one way or the other may require increasing or decreasing the jets by two to four sizes. As soon as the engine starts (assuming this is a newly built engine), the engine needs to run at fast idle 1,100 to 1,500 RPM for its initial break-in period. The first step is to obtain a low-speed tach that will show minor changes in rpm along with a vacuum gauge. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. I want to do a little testing to see how much hooking up the vacuum advance actually advances the timing over the baseline. A good place to start is with the factory setting or -turn out on the adjustment screw. Find many great new & used options and get the best deals for Quick Fuel Technology BR-67212 Brawler Street Carburetor at the best online prices at eBay! Except Im running a single plane. They offer all the tunability that you would find from more expensive carburetors in the market, including four-corner idle adjustment on all models. To improve our situation, we contacted the officials at Brawler about a four-barrel (4bbl) carburetor to replace the restrictive 2bbl. Enter The 2023 LS Fest West Trip Sweepstakes Today And Join Us In Las Vegas! If engine speed increases with that one screw, adjust all of the others to match. One is to preadjust the idle mixture screws to about one full turn out. So Im watching this. If the initial change results in a loss of rpm or vacuum go back to the baseline and then turn the idle mixture screws in the opposite or counterclockwise direction. There is one more adjustment left after you establish the correct power valve opening point. So if you get a 12-inches of vacuum reading, you need a #6 power valve. 236-244 cam 10.5:1 compression, 213cc profiler heads. Brawlers come with the latest technology in air/fuel calibrations for modern street or race engine demands. The air/fuel ratio will change with ambient temperature, barometric pressure and humidity. However, setting the vacuum secondary opening point requires trial and error road testing of the vehicle. Bob (carb guru) says the carb looks like a really nice piece, and responded well to tuning. Im running a 3.5pv now with 68/79 jets with pretty close engine specs to yours. I'm thinking about putting a few more degrees of timing in it to maybe 18 initial, just dont want to go too high on total as this will put me in the 37 range. Set the front to 0 rpm. I, Dencan Brain BOIDAR, call myself a Torque master. Brawlers performance based race carburetors start off with a high flowing aluminum main body, and billet aluminum metering blocks that are packed with performance based air fuel calibration. We feel you have purchased the finest street performance carburetor currently on the market. {}J+:X" ^@L\cQ0/S;+v..WMu~v"EN}RDH'T\N.rHE:?^SW/g6|c@wzk{ rUq\\rnCB>3J/A Bt]eEG;@L@&p^U^qW+y$ DZE,'I9~[;t>&s|c?`OUJxn\>eqvVwHB:%tr;dtWo_NH',C:_|l2EYXY#yu[:%]NO@VQ mDVaLjIhXqz'yFt/l){Tta)` nibdkp+Y2h8p6$CGJZ//~v 3R. Mechanical carburetors lack that ability, although some of the electronic feedback carbs from the early 80s could vary the A/F mixture. No sweatthere's a conversion kit for that. Keep in mind that the meter readings are an average for all of the cylinders that are dumping exhaust into that pipe. With each small change, wait for a moment to allow the engine to stabilize. <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> A balanced or neutral A/F ratio of 14.7 to 1 (stoichiometric) is good for fuel economy and emissions, but not so much for power. HGM's AccuLink is a very slick stainless steel conversion kit that adds a GM-style TPS sensor to all popular Holley, Q-Jet, and Edelbrock carbs. Now shoot a little WD-40 or other lube on the threads of the four screws. If it does not, look first for slack or clearance between the vertical accelerator pump linkage arm and the lever that moves the actual accelerator pump diaphragm. Setting up a rebuilt carburetor. That is primarily determined by the amount of engine vacuum available at idle. can I split off my trans modulator and the vacuum advance off the same source, the baseplate of the carb? Cold start circuit. So, if your vehicle is surging or coughing through the carb (popping) at wide-open throttle, you can richen it up with larger restrictors. QFT equips its carbs with large sight glass windows right in the side of its fuel bowls, so it is easy to check the fuel/float level. This means we have to increase the PVCR by the same area, which came out to very close to a 0.062-inch restrictor. Floats, Idle Air, idle on a Holley 4150 Brawler. Brawler carburetors are precision-machined and hand-assembled by craftsmen right here in the USA. I may not be able to post any results until later this weekend when I actually have time to work on the thing. For peak power, most engines like an air/fuel ratio of 12.8 to 13.2. Choke Type: Electric. The Brawler was taken apart, made sure there was no junk inside it, put back together as it came except with 70 P and 80 S jets (74-84 stock) idle air bleed change (went from 70 to 73 IIRC), PV went from 6.5 to 3.5 with the crappy vacuum, 31 squirters front and rear. Save my name, email, and website in this browser for the next time I comment. There's more to tuning the Holley power valve on the primary side than just choosing when the valve opens. Specs Service Parts Non-Stick Gasket Assortment 4150 Part# BR-67220 $19.19 Qty: Add To Cart Emissions 3 You must log in or register to reply here. Tools Bible is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising & linking to Amazon properties. The moment the throttle linkage moves, fuel should exit the nozzle. The new products include non-stick gaskets, rebuild kits, power valves, needle and seats, and air bleed tuning kits. Murphy has made his own fixture to hold the main body so he can mill not only both primary and secondary metering block surfaces, but also the throttle plate surface. A good rule of thumb is that if a QFT carb has a choke it comes with a 6.5 power valve. These kits are inexpensive and are incredibly helpful when tuning PVCR's. Intake is a stealth. Thats where the power valve circuit comes in. This enriches the mixture when the engine is under load to maintain the A/F ratio. Although power numbers are the main interest of many enthusiasts, our Dart will not see track time. After pulling the carb I noticed that the curb idle setscrew was completely off the lever. If over, Turn idle mix screws out 1/8 turn. Specs Service Parts Non-Stick Gasket Assortment 4150 Part# BR-67220 $19.19 Qty: Add To Cart on the dyno this thing made over 500 hp and darn near 500 ft lbs. It's now a long way from the endangered species list. It is worth mentioning that the fuel pressure gauge should be installed on the outlet side of the regulator as close to the carburetor as possible. I have a 385 in my Camaro, 11 to 1, Howards hydr roller (240-246 @ .050 with a 110 cl) AFR 195 heads and a street warrior air gap dual plane. I've always been fascinated with cars and tools accessories. To support the popularity of the Brawler carburetor it seems only natural to add rebuild kits and tuning parts for them. Brawler | #424BR67199. Related: 10 Biggest Carburetor Tuning Mistakes. So much of the Holley carburetor romance has to do with an old-school look that includes that retro zinc chromate appearance. Proper adjustment is critical for a good idle. NOTE: Adjusting fuel pressure with the engine running could cause a fire hazard. An engine that stumbles, hesitates or bogs when the throttle opens usually needs more fuel from the accelerator pump, or the carburetor is way too large for the engine. Altitude and barometric pressure also affect air density. The 3rd phase of new Brawler carburetors build on the success of the originals by adding more CFM sizes & a black coated finish with red billet metering blocks & throttle bodies. thanks. If the engine will idle at 14:1 air/fuel ratio that's really good. Holley makes several kitsmainly for either the 0-3310 750 cfm or the 0-1850 600-cfm carbs. Are the gaskets and seals in good condition, or are they dried out and leaking? Street models are available in variations from 650 to 850 CFM Carb in both vacuum and mechanical secondary versions to meet any of your needs. Intake manifold vacuum pulls fuel through metering circuits while atmospheric pressure provides the push. Brawler BR-67199 Race Carburetor, Mechanical Secondary, 650 CFM. Running 6.5 psi fuel pressure, floats are set correctly. While it is possible to do this yourself, it involves buying chemicals and a knowledge of the technique. Much of this is determined by the tightness of the converter. QFT recommends an optimum fuel pressure of 6.5psi, (Maximum pressure of 7psi). This includes the choke, fast idle cam and linkage, and fast idle adjustment screw. Our original factory '60s Holley was haggard looking. You can build a killer motor using all the best parts and machine and assemble everything with the utmost care, but if its a carbureted engine and the carburetor isnt set up or tuned right your killer engine may never live up to its full potential. If an engine is hard to start, barely idles, coughs, bogs, sputters or stumbles every time the throttle opens, gets horrible fuel economy, spews black carbon from the tailpipe or never seems to run very well, chances are the carburetor needs to be tuned. Float. x\r6N xt:[;N;&kEDL$Jdp}'dlPs[$>f?o} s]b8?e.w@!YKM~RL?`S,l:? Partner: Holley (https://holley.com) Sponsor: Roadkill Customs (https://RoadkillCustoms.com)These days, the talk is all about EFI and fuel injection retrofit kits. But the good news is that that original appearance is easy to restore. Holley sells a green Viton rubber diaphragm intended for alcohol carbs but works great with the 10 percent ethanol in today's pump gas. Vintage muscle cars, street machines and hot rods dont have to worry about emissions in most instances so there are no restrictions on what kind of carburetor, the size or even the number of carburetors that can be used on an engine. Reading the spark plugs can also give you a rough idea of whats happening to the A/F mixture. With a dyno, you can see whats happening with the A/F mixture, horsepower and torque curves as the engine makes a pull. I was having problems with the electric choke which then sent me down a massive rabbit hole. Once you understand them, you can spend many enjoyable hours perfecting the fuel curve for your engine combination. Yet when additional throttle is added for light acceleration, the engine stumbles. I do have the dyno sheet somewhere at the house, have to look tonight. Brawlers come with the latest technology in air/fuel calibrations for todays street engine demands. MSD did say the timing would start advancing at 7", and thats all I have so I guess par for the course. Reducing the primary jets will lean the WOT jetting so you would need to compensate. The carburetor will also deliver the optimum air/fuel ratio throughout the engines RPM range to achieve peak horsepower and torque. Some blocks come with screw-in PVCRthis block just uses a drilled passage. On all Holleys there are two power valve channel restrictors (PVCR) that determine the amount of fuel delivered to the boosters over and above the fuel metered by the jets when the power valve opens. The conversion kit (foreground) replaces the metering plate like on the 4160-style carb on the left and replaces it with a metering block like the 4150-style carburetor on the right. Using a carburetor that is more closely matched to the engines displacement will deliver better performance and drivability than a carb thats too big. Many circle track rules restrict the type of carburetor or modifications that can be made. Lightly clamp the steel diaphragm shaft in the vise. Tech Note: This model of carburetor has the square bore flange bolt pattern. Manual chokes require no adjustment but do require a certain amount of finesse when it comes to starting a cold engine. If the carb has screw-in fuel filters, are the filters clean and unobstructed? These slots are intended to pull additional fuel from the carburetor's idle circuit that is controlled by the idle feed restrictor. Do this 2 times. If the main jets feel right and the engine is too rich under full throttle, then you can also reduce the size of the channel restrictions. 237/ 247@0.050, 600 lift. If they are black, your jetting is too rich. Watch out for leaking or heavy floats. A mistune, on the other hand, can create all kinds of problems. That was 30 years ago. We went to Zach Baker, a technician at QFT that spends much of his time talking customers through the correct tuning procedures, to give us his proven step-by-step carb tuning tips to get the most out of your carburetors performance. To adjust the fuel level, first shut the engine off, loosen the locking screw and adjust the large nut that raises and lowers the float on the top of the bowl. So unless youre ready to swap out the carb for a bolt-on fuel injection system, keep that screwdriver handy. Black carbon deposits on the center insulator and electrodes would indicate an overly rich A/F mixture (or the spark plugs are too cold for the engine). Brawler would like to congratulate and thank you for purchasing this carburetor. In fact, the HGM AccuLink is designed to work with Holley, Q-jet, and the Edelbrock carburetors. I have not had the greatest of luck with these, either the customers got "blems", or just a run of bad luck.but a 1/2 dozen in a row.I'll leave it at that. This TPS can also be used for data logging for autocross racers who want to look at throttle position on track through the course. Murphy brought it right back to life with a rebuild and a dip in his acid etching process that makes it look like new. A slightly rich fuel mixture is necessary to make peak power, but if the A/F mixture is way too rich, excess fuel can wash down the cylinder walls and dilute the oil. This carb is on a 460 in a 77 f150 4wd manual trans truck. Too lean is even worse. The dropped boosters are used in all of Holley's 4150 performance carburetors while the standard carburetors are equipped with straight boosters. Popularity also breeds carburetor misapplication, frustration, and the occasional bouts of misinformation. Start each screw by hand as the lid is held in place on the diaphragm. Dont let the budget friendly price fool you, the development of Brawler carbs focused on performance and not some flashy packaging. If you think that the jetting might be a bit rich at light throttle, you can try running leaner primary jets. After you have attained the highest rpm possible, you might have to turn down the idle adjustment on the throttle linkage to get the correct idle speed you want. Mine didnt smell rich, the plugs were just super soot filled. Is the carburetor body, top plate and throttle housing flat and free from fuel or vacuum leaks? A set of calibrated pin vises really helps dial in restrictor sizes. Of course, this is also the perfect time for perhaps a upgrade or two to make the carb work as good as it will now look. After you lock down the screw you can start the engine and re-check the fuel level. Start the engine and turn one of the idle screws in or out. Your email address will not be published. You are using an out of date browser. Brawler BR-67199 Race Carburetor, Mechanical Secondary, 650 CFM. The powertrain control module (PCM) controls the fuel mixture using inputs from the engines exhaust oxygen sensors, throttle position sensor, manifold absolute pressure sensor and airflow sensor. Available sizes from 570 to 770 CFM to match your needs. Carburetor tuning runs the gambit from simple idle speed and idle mixture adjustments, resizing main jets and fiddling with the choke adjustment (street applications only) to major modifications such as changing venturis, venturi boosters, air bleeds and emulsion tubes, metering blocks, accelerator pumps, cams and discharge nozzles, and power Blip the throttle to 2300, no more. You can identify these carbs by the four vertical holes adjacent to the air cleaner stud that allows air (controlled by the adjustment screw) to bypass air past the throttle blades. The fuel level should be exactly half way up the window. Heres a quick how-to that covers installing a new Holley Brawler double-pumper carburetor. When making adjustments -turn at a time is a good way to proceed. A continuing problem for street engines running big camshafts and lots of overlap is low idle vacuum. Understanding Holley Vacuum Secondary Carburetors, How To Choose A Regulator For Carbureted Vehicles. ran great once a few issues were solved. The crew shows how to save cold-hard-cash by overhauling an Edelbrock AFB-style 4 barrel performance carburetor. It can also foul the spark plugs. You will see here, the beauty of the carburetor in it's natural habitat onboard a large displacement American V8 and bolted to the Holey Goat. Depending upon what altitude you live at (sea level in LA or at 5,000 feet in Denver) your carb may need a main jet change. When Holley redesigned the Ultra XP line of carburetors, they added an adjustable air bypass feature located underneath the air cleaner stud. The best route here is to split the difference and make them both one turn out. Turning the screw in slows the opening rate, turning it out makes the secondaries open sooner. If the engine is on a test stand (not a dyno) or in a vehicle, you can use a handheld A/F meter with a wideband O2 sensor to measure the A/F ratio in the exhaust. Just a little wary of too much timing. Aug 25, 2018. Murphy prefers later-model boosters with the gentler radius at the bend that improves flow and its inside diameter is slightly larger at 0.160 inch versus stock at 0.140 inch. HGM is the company that makes the very nice CompuShift controller for the electronically controlled overdrives. Will put my AR3924 plugs in it, bump up the initial timing to 20 and see what happens. Electronic Fuel Injection (EFI) is all the rage today and rightfully so. Hooking up the vacuum canister only gave me another 5* though. Many other variables can also affect the air/fuel ratio such as open headers versus closed headers, changes in header length, camshaft changes, gearing and tire size changes, track length, etc. Is there a history of these Brawler carbs being questionable? Wait a few seconds and idle should be exactly 1400. Here's the trick to assembling that tricky vacuum diaphragm canister. Yet the carburetor is most often blamed. This Holley Ultra XP and some older HPs employ a bypass idle circuit with an adjuster screw located underneath the air cleaner stud mounting boss. Just have fun with it and get the vehicle on the road and driving. Theyre a perfect replacement for your daily cruiser and they come in sizes ranging from 570 to 770 CFMs.Brawler street carbs sport billet metering blocks with calibration for todays street strip demands. Before the engine starts, check the position of the idle mixture screws (located on either side of the metering block) by counting the turns on each one in until it lightly seats. The proper way to check fuel pressure is with the engine running at idle with the engine up to full operating temperature. The transfer slot adds fuel to compensate for increased throttle opening before the main metering system kicks in. Dont let the budget-friendly price fool you, the Brawler development focused on the performance you want and not the pretty box that it comes in. So let's say we want to reduce our primary jetting from 75 down to a 70 and the PVCR's are currently sized at 0.060 inch. The basic difference between a carburetor and electronic fuel injection is that a carburetor is totally dependent on intake vacuum for fuel metering and delivery. If the engine doesnt hesitate or bog under acceleration, the secondaries could be opening too late. At idle, there should be zero clearance or even a slight preload between the linkage and the actual diaphragm. What you are looking for is an increase or decrease in rpm. We've seen the standard accelerator pump diaphragm become brittle with age. If youre tuning a carburetor the old school way, test driving or taking a few hot laps will quickly tell you if the engine feels strong or not, and how well it responds to throttle changes. Dont let the pursuit of perfection ruin your project vehicle. Similar to the Mr. Gasket #1932. Ive got the idle set at 1000 rpm with the vacuum advance hooked up to manifold vacuum. Who doesnt like a little bit of burnt rubber? Okay, now comes the fun part. One of the requirements for this conversion is it requires a throttle position sensor (TPS) signal to work properly. Preadjust the idle speed screw on the throttle linkage so the throttle plates are closed, then tighten the screw one full turn for the initial idle setting. Set the back to 1000 rpm. Replaceable high speed air bleeds and idle air bleeds help you adjust to the changing conditions. Cam is a solid lift from the mad porter. With the engine idling at normalized temperature, try leaning the mixture with a minor clockwise turn of both idle mixture screws. Murphy also prefers to eliminate the stock steel ball that Holley uses to trim the opening rate. Electronic fuel injection is also self-tuning and is constantly readjusting the A/F mixture based on feedback from the oxygen sensors. ex 0.437 int lift 0.454 ex lift. These components are usually necessary for most street driven vehicles, especially in cold climates, but can usually be eliminated in most racecar applications. The main circuit also includes emulsion tubes and air bleeds that premix air with the fuel to improve fuel atomization. Brawler carburetors are precision-machined and hand-assembled by craftsmen right here in the USA. . endobj Content for engine professionals and enthusiasts, Choosing the Correct Block for Your LS Engine Build, UNDERSTANDING OIL CLEARANCES IN ENGINE BEARINGS, Americas Best Engine Shops 2022 | H&H Flatheads, Americas Best Engine Shops 2022 | Choate Engineering Performance, Americas Best Engine Shops 2022 | 4 Piston Racing, Intellectual Horsepower: All About Harmonic Dampers, Reviewing Holleys Terminator X EFI System. It can replace Holley, Edelbrock, Carter AFB, and Autolite style carburetors with 5 3/16 x 5 5/8 bolt pattern. stream The ledge means the metering block mounting surface has been machined. The kit also comes with the correct jets to retain the stock jetting. The carburetor is a Holley Brawler 570. MSD 8365 ditributor, coil, 6AL2, 8.5 wires, everything is new and works. I'm going to hook up the vacuum advance to full manifold vacuum and then reset my base to 15 again. Big cams like a lot of initial, always use he vacuum advance. Engine testing all carburetors prior to shipment ensures that when a new QFT carb is bolted on an engine, it will start, idle and perform up to the customers expectations. Most QFT carbs come from the factory with .043-.048 power valve channel restrictions. cant get more than about 7-8" of vacuum out of it. Put a Brawler 750 DP on it in the car. The equipment does exactly what it needs to, his team is experienced and the shop has built thousands of vintage engines for customers everywhere! Youll need it! The float opens and closes a needle valve that allows fuel to enter the bowl. There should be zero clearance or a slight preload on the linkage arm to the accelerator pump lever. Generally these restrictors are permanently drilled passages in the metering block. pig rich. So instead, we focused most of our time on street driveability. Vintage 1980 Yamaha Enticer Snowmobile Revival to Former Glory. The newer HP and Ultra XP carbs come with screw-in restrictors. When it comes to selecting jetting the most accurate means. 1 change at a time. Caution: make sure you are using a tested, known power valve. While the gaskets are thick, this still causes sealing problems that can lead to erratic performance. The engine starts right up and practically idles right away cold. Are the fuel bowl inlet valves in good condition and not sticking or leaking? Brawler BR-67255 Carburetor, Mechanical Secondary, 650 CFM (7) Carburetor Barrels: 4-Barrel. Zach says that .005 change in size will be a noticeable difference. A good tune means the engine should start and idle without stalling, and respond instantly when the pedal hits the metal. Available in both vacuum and mechanical secondary versions to meet your needs, All models have dual inlet fuel bowls with sight glass windows for safe and easy float adjustments, All models come with an electric choke for easy starting in colder climates. If you can tune a carb to deliver a consistent A/F within this range, the engine will usually run at its full potential from off-idle to wide open throttle. Stay up to date with the latest releases, events, promotions and more. Once this is properly adjusted, it's also possible that the accelerator pump nozzle size can be reduced. A power valve that is too small may not increase fuel flow enough under load, causing the A/F to go lean. Holley conversion kit 4160 to 4150 (0-3310), Holley conversion kit 4160 to 4150 (0-1850). If its brand new, its history doesnt matter. Brawler carburetors are loaded with the latest technology in air fuel calibration to meet the demands of todays street, strip, and race engines. The goal here is to deliver enough fuel for crisp throttle response without going too rich and flooding the engine with excessive fuel. Some Holley tricks don't have to relate to performance. Floats, Idle Air, idle on a Holley 4150 Brawler.. Brawler carburetors are loaded with the latest technology in air fuel calibration to meet the demands of today's street, strip, and race engines. Today, Cummins Inc. (NYSE: CMI) announced it will launch the next engine in the fuel-agnostic series, the X10, in North America in 2026. 850 qft brawler 75 main jet 85 secondaryjet 383 sbc 11.7 compression Motown single plane intake Lunati voodoo solid roller .605/.605 254/258@.050 Afr 210 heads Msd ignition locked out at 36 Full throttle and cruise it seems fine. Has somebody screwed around with the main jets, float settings, metering blocks, venturis, air bleeds, boosters or throttles and really messed things up? If anyone has more ideas, please feel free to post. Honestly I've never run vacuum on any distributor I've ever ran, as most of my stuff was strip only. If youre building an engine that will run on alcohol, is the carburetor properly jetted for alcohol (which requires a much richer A/F mixture) and additional corrosion protection). In a properly adjusted curb idle setting, the tip of the throttle blade should just uncover the end of the transfer slot (above). Vacuum secondary carbs control secondary opening with venturi vacuum opposing a diaphragm and spring. Cars with automatic transmissions may need a slightly richer idle mixture setting to allow the engine to idle smoothly in gear. Set the idle mixture for the best idle quality along with the leanest air/fuel ratio.

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