Su hif carb He explains the process while he actually works on some HIF 4 carburetors on an MGB. Jul 7, 2018 · Today I synchronised the twin SU carbs on my Silver Shadow 11 using the kit supplied by Kelly Opfar at British Tool Works. This is the carb used on the later Classic Minis 1275cc engines. 3. To adjust the float level bend the brass arm which rest on the needle valve. Aug 4, 2015 · 73 MGB. HS carbs with the later all nylon float and delrin type needle. Carb's are stripped, cleaned and completely rebuilt with genuine S. 44 +$158. Here you can follow our exploits as we prepare, race and repair our racers throughout the season. Surprisingly there are no O rings fitted into the shaft itself- despite the presence of very obvious grooves. Remove the piston damper (1) and its washer (2), if fitted. You need to be aware that there is 2 models of the HIF type carburetor used on the MGB. carburettors su hif 44 carbs pair for land range rover classic stage 1 v8 88 109 item 1 carburettors su hif 44 carbs pair for land range rover classic stage 1 v8 88 109 $395. 125" and 0. How to overhaul SU HIF4 carbsI walk you through the process of stripping, cleaning, inspecting and reassembling an SU HIF4 carb off an MGB from start to fini Order your Carb Rebuild Kit (For 2 Carbs) - SU HIF4 - MGB - CRK116 ⛽ Low prices and fast, worldwide delivery British car experts ♚ Call ☎ 01522 568000 or ☎ 1-855-746-2767 Special Offers Get ALL of the latest offers & promotions delivered right to your inbox! Jan 13, 2012 · In addition to obtaining the basic HIF rebuild kit for each carb, be sure to pick up a new temperature compensator for each of the carbs. HIF Type Carburetter: Tuning (General) It is essential, particularly where vehicles' are equipped and tuned to comply with engine emission control regulations, that the carburetters are tuned in accordance with the vehicle manufacturer's tuning data. For vehicles with SU-HIF carburettors with spring loaded metering needle More info £34. Way back when they were current models this recessed screw was sometimes covered with an alloy anti=tamper plug (so that customers could not fiddle ! ) but doubt if any are still covered up 30+ years later. The cold start valve of the HIF provides instant starting from cold with a very effective and easy to adjust fast idle. View. It is strongly recommended that you understand the Replace your worn out original Zenith Stromberg 175 carburetor with a new easier to tune manual choke SU carb. R. C. Feb 26, 2024 · The carbs are not original. Later carbs can have 2 O rings and no gasket. 5 Litre petrol 90 / 100. A diagram of SU 38/44 HIF carburetor parts historically available for the classic Mini Cooper. Choose from the HIF4 Type Gasket Pack, the versatile HIF6 & HIF44 Type Gasket Pack, or the HIF38 Type Gasket Pack. U carburetters, the HIF uses the variable choke/constant depression principle to achieve the precise induction of mixture required to control the Mar 25, 2018 · 73 MGB. A number of good-quality manuals dedicated to the SU are available and are highly recommended. The often underrated SU offers good versatility and reliability. At Burlen we continue that heritage and passion with SU Racing. 03. Renewal is cheap and worthwhile because porous hoses both influence the gasmixture as well reduce the vac ignition advance at idle if manifold vac is used. Originally introduced as the HIF4 (1. SU HIF44 Carburetter Spare Parts. Additionally Hif carbs have shaft seals. If you'll pardon Turn each screw very slowly clockwise by the minimum amount until the maximum speed is regained. Please check with your local emission statutes for legality. The numbers in the drawing correspond with the numbers in brackets in the item description on this page. First some assumptions: • You have a shop manual and have reviewed it. U parts, including spindle, spindle bushes, choke and throttle seals, new main jet, float valve, seat and gauze, as well as all gaskets and o-rings. A detailed guide to reassembling HIF Type carburetters. Oil filter: Yellow, usually full of oil. The conversion carb is supplied with the gaskets you’ll need, and is adjusted ready to run the engine. Apr 2, 2006 · Need some help here. A regulator valve (which you can see in the pics) was also installed. Mar 18, 2024 · The HIF 44 is SU’s most modern carb of the period. Jan 13, 2024 · I'm restoring SU HIF 4 (AUD550) carburetors from a 1974 MGB. My experience with the SU HIF Carburetor setup has been good. A far superior design than the early HS style, the HIF uses an internal float, throttle shaft seals, and improved adjusting screws. Functionally similar to previous S. Includes essential tips on throttle disc placement, jet assembly, float adjustment, and ensuring smooth operation of all components. Lift the chamber assembly (4) vertically from the body without tilting it. From this setting adjust the mixture screws according to the vehicle manufacturer's recommendations. Rather, there is a rotating orifice that varies the fuel/air mixture when the choke cable is pulled. and noticed a few things about the HIF. We would like to show you a description here but the site won’t allow us. The SU Type HIF-6 carburetors was used on Volvo automobiles from 1971 to 1974, as well as later Volvo power units. Even it's external appearance remained unchanged until the late seventies, early eighties - the classic illustration of a basic and simple concept that was very hard to improve on. The HIF type is available for both single and multi carburetter applications, complete with all necessary connecting linkage, in throttle bore sizes of 38. HIF Type Carburetter: Dismantling Step 1: Suction Chamber Removal (Standard) Thoroughly clean the outside of the carburetters. Sep 26, 2023 · One last remark on the PCV function associated with HIF's: the rubber hoses between the Y-piece and the two carbs may get porous over the years without you noticing this on the outside. Discover expert guidance on HIF Type carburetters. On this page you will find our currently available original SU Carburetter Spare Parts for the HIF44 series. In either case, the idea is to zero out the jet: raise it all the way up in the bridge. Dec 11, 2024 · SU Carburetor Tuning – Overview; SU Carburetors – Matching the Air Pistons; SU Carburetors – Understanding How They Work; SU HIF Carburetor; SU HIF Carburetor Tuning; Zenith Stromberg Automatic Choke Carburetors; Zenith Stromberg Maintenance. Using the HIF carb requires the use of an appropriate heat shield with integrated securing points for the throttle and choke cables. 5") and HIF6 (1. Home > Fuel System > Carburetors > HIF6-44 1. They are SU HIF, probably from a mid-70's MGB, but I don't know this for sure. Jul 14, 2018 · This is a very lengthy post, with nearly a hundred photos; be warned. UK Spec Cars retained the HIF 4 from 1972 to the end of production in 1980. Connected throttle cable and choke, the car started right up with choke pulled out let the engine run for a few then pushed choke back in and the car stalled immediately, crushing my spirits. 75" > Jan 5, 2013 · HIF 4 Carb Setup and Mixture Adjustment This article attempts to provide some alternative mixture adjustment and basic set-up advice for the HIF4 carb and grew out of a thread whereby I was encouraged to submit the main points as a library article. I haven't seen much in the way of step by step instructions or video tutorials for rebuilding SU HIF 4 carburetors so I decided to make one. The original HS carburetors were used on MGBs from the launch in 1962. For HIF carbs, you can try turning the screw while looking down the throat to see which way the jet is moving. Thread Those sites are mostly OHV B18/B20, but the carb is an HIF-6 and most everything is the same. The gap between the float and the lid face should be between 0. SU is famous for motorsport and racing lies deep within its history. Item #: SIE0078 - A very handy kit of special HIF carburetor screws, springs, and pivot pin. Apr 10, 2023 · The SU carburetor is a type of carburetor that has gained popularity among classic car enthusiasts due to its simplicity, reliability, and performance. The basic SU design has maintained the same basic format since it's inception. Aug 24, 2018 · 73 MGB. Mar 13, 2019 · SU Carbs - HIF, a more finely honed instrument. This holds the carbs together as a pair and saves disturbing the spindle and its settings. 015" thick. This is due the SU being analogue and the vast array of needle profiles available. 187" with the float resting on the needle but not depressing it. 75"), these have been modernized with the HIF38 and HIF44 series. This carb was used on the later-model Classic Mini's with the 998cc engines and is a great upgrade from the HS4 style or if you want to improve fuel economy on a 1275. May 11, 2017 · Cold start system- this incorporates a gasket, (fits to carb body), O ring (mechanism outer shaft) and a seal (threaded end of shaft) covered by a cup washer. The car has an electric fuel pump. Tuning and installation instructions are supplied. 17 shipping May 16, 2020 · Hi I have purchased a 2nd hand Single Hif 44 SU Carb with a Howley Manifold to use on my 1275 Midget with a Maniflow LCB Exhaust manifold, I found this combination worked well on a Mini i had years ago, but that was an HS6 The carb appears to have an O. Out of interest, the tube dia where it enters the carb, is the same dia as the vacuum tube then another larger dia piece of tube, with the "o" rings on, enters the filter body. I believe they are HIF 4, but there are no tags, I'm just basing that on flange shape. O-Ring/Diaphragm; Zenith Stromberg Water Choke Rebuild; Zenith Stromberg Water Choke Rebuild Videos May 18, 2017 · (The following is how I removed the carbs for a full strip down. However if you do not need to disturb the choke or throttle, its easier to tie the carbs together with string, compressing the spindle and cross carb fuel pipe. For example there is a device that changes the jet position based on the temperature of the fuel to maintain an even mixture. And it’s fully rebuilt using original equipment SU parts. A bunch of other stuff most cars have but not really important enough to itemize. The job took only 10 minutes or thereabouts and the improvement in general performance is quite noticeable even though the carbs weren't far out of synch before I adjusted. We race classic Mini touring cars and Ogle racers in a variety of series including racing at Goodwood and Spa. and a strong accelerator spring as part of the linkage. Dec 8, 2018 · You should familiarize yourself with this HIF type carburetor, First off these are pretty much the simplest SU type which is the simplest of carburetors. 75 in), and may be mounted at any angle from horizontal to 40° down draught inclusive. 187". SU Carburettors The SU carburettor is a relatively simple design but has proved to be very effective. SU carburettors can theoretically perform better than modern computer controlled fuel systems. Dec 11, 2024 · SU HIF (Integrated Float) Carburetor Tuning is performed by John Twist. This is done by either lowering the height of the jet, thereby increasing its effective area (H and HS types), by passing additional fuel into the carb venturi from a separate device on the carb (HIF type), or by starting the engine largely on a very rich mixture from a separate small auxiliary starting carburetor (“thermo-carb”, used with For separate float-chamber cars, this means raising the mixture nut all the way up against the bottom of the carb (or rather, against the spring). The HIF is a far superior design than the early HS style that uses an internal float, throttle shaft seals, and improved adjusting screws. Sep 22, 2014 · Hey folks I have been working my new second job rebuilding SU carbs. HS carbs with the early nylon float and steel needle. Check that the point indicated on the float is 1mm +/-0. 5mm below the level of the float chamber face. Headlights: Not that bright but bright enough. Ref Nov 24, 2021 · The HIF44 / HIF6 1. Given time I will machine another inlet tube. The HIF-6 was designed as a "Horizontal Integral Float" carburetor to reduce pollution from evaporative emissions. U HIF 44 or 38 carburettor. This is a Carburetor Kit for MGB 1972 to 1974 with HIF4 carburetors (AUD550). 030" thick and two . Distributor: Yes. The type HIF (Horizontal Integral Float Chamber) carburetter has been designed primarily to meet the requirements of exhaust emission control carburation systems. It is strongly recommended that you understand the theory of operation and the mechanical layout of the carburetor before you start. MGB with twin SU-HIF4 carburettors - LHD models Here is how I set my new carbs to ensure an easy start on a fresh rebuilt carb. Although there are a number of different versions of the HIF type carb, they all essentially share the same type of connection layout. The diagram below depicts the most common type - the connections can be on either the right hand side (as illustrated below) or the left hand side. Dec 30, 2019 · General Guidelines for Installation of HIF-6 or HIF-44 Carburetors. O Valve Kit on it Sep 22, 2017 · You own a workshop manual covering the SU HIF-series carburetors. i double checked everything before putting back together. This is a great upgrade from a twin set up and is easy to adjust and maintain and delivers high performance and reliability. These guidelines make several assumptions, among which are: 1) You own a workshop manual covering the SU HIF-series carburetors. HIF4/38 and HIF6/44 The HIF Series is the most modern SU carb. That was the easiest way. May 22, 2013 · Unlike HS carbs, the choke mechanism on HIF carbs does not work by pulling downward on the jet in order to enrich the mixture. SU Carbs - Connection, HIF type. These would be the stock carbs on a 1972-1974 US Spec MGB. The advice from HNJ Engineering was to use a cable from an early 2. Perfect for ensuring your engine runs smoothly. In this article, we will provide an in-depth guide to the SU carburetor, covering its history, mechanics, advantages, and disadvantages, as well as tips for installation, tuning, maintenance Nov 29, 2017 · Connecting all the fittings on your HIF SU Carb on your Classic Mini Cooper is made easy with this picture based instructions Ask the experts at MiniMania com × 1-800-946-2642 Home My Account Social / Forum Articles Contact My Cart Jun 6, 2021 · SU HIF 44 Carburettor The conversion kit is designed for the RHD vehicle in mind, so the new throttle cable supplied would be way too long for LGL. Won’t hurt to use new compensator screws and springs too. Very popular british carb, later model Hold the carburettor in an inverted position so that the needle valve is held in the shut position by the weight of the float. Ref: FZX3006, FZX1280, FZX1313, FZX1462. Moss 373-590 or equivalent. HIF Type Carburetter Reassembly | Step-by-Step Guide | SU Carburetters Mar 11, 2017 · Jeff, I swapped the carb with the broken inlet tube for another carb. Rebuilt the SU HIF carbs on my 1974 MGB, mounted them back to to the engine. 062" and 0. Rebuillt S. Harry Tuttle Nov 8, 2008 · HIF SU Carbs mixture adjustment screw – cross slotted screw recessed just above float chamber flange joint. SU HIF Series Carburetors are found on : HIF4 MGB 1972-75 and several other British vehicles and Volvo's. 96 Product number: 25163. 75'' SU carburetor has generally become the carb of choice on 1275cc and larger engines. 5 in) and 44-45 mm (1. The seal kit I purchased includes 3 "needle & seat shims" one . U. What makes this kit head and shoulders above the rest is the quality of the parts that are assembled in the kit. Rebuild Kit - For a pair of HIF4 Carburettors. Each kit will come with the metering needle (ABD), jet, needle and seat, plus all of the gaskets and seals to assemble the carburetor. (See graph in HIF type carburetter: Tuning Single Carbs). There is rubber seals at the outboard end of the throttle spindles that may dry out and allow some leakage. See arrow on image. JUST SHAFTS REBUSHED - $175 pre carb - Carburetor body re-bushed - New throttle shaft installed. Tires: Round, black, hold air. Oil: Sometimes old, sometimes newalways slippery. Step-by-step guide to tuning single HIF Type carburetters. Seven stocks the latest types. Each is designed to maintain optimal engine performance and durability. Please click HERE for the exploded view drawing of the S. The gap between the lever and the face of the lid should be between 0. Jan 12, 2024 · HIF's work fine with poppetvalves retained, these combat burbling sounds on engine braking situations by letting a bit of mixture in on overrun Guess how I know having tried: OEM HIF disks with poppet valves in, HS disks without and new HIF poppet valves disks (retained up till now) As for late SU needle types: I once more include the overview. Carbs: 2 SU HIF. HIF6 is a larger version of the HIF4 It explains how the SU HIF Carburetor works in great detail and how it differs from the SU HS Carburetors. Our HIF Type Gasket Packs offer reliable sealing for various HIF carburetor models. The exploded carburetor diagram that came with the seals shows a shim under the needle seat with the note Mar 18, 2024 · The HIF 44 is SU’s most modern carb of the period. 1 mm (1. Learn how to adjust throttle, mixture, and fast-idle settings for optimal performance and emission compliance. The float bowl is integrated into the bottom of the carb body rather than a separate float bowl as with the HS2s. Explore maintenance tips, tuning advice, and detailed technical insights for optimal engine performance. Unscrew the suction chamber retaining screws (3) and remove the identity tag. Some parts are different between front and rear, this can cause confusion. Mar 18, 2025 · Sundries Kit, SU HIF Carburetor (SIE0078) Price: $27. This versatile kit will suit all 1275-based engines, the brand new carb supplied with matching alloy inlet manifold, all new linkage and a popular MED stub stack kit. Nov 12, 2002 · SU HIF-6 carb adjustment. Includes a full set of Gaskets and Seals, main Jet, Needle Valve and seat for the Float Bowl, Spindle and Bushes, Throttle Disc and Screws. Mounts to existing manifold and maintains the original look of the engine compartment. The HIF44 SU carb is a favourite for fast road usage, slightly easier to set up than twins yet still capable of fueling 1380cc engines with over 100bhp. F. HIF44 carburetors. oafd bkqutkdm mufyxpto nwlgj doe gmtb bjbpqi wlomh lde jecklqh