Tuning su carburettors sterling british motoring society. Haynes weber carburetor manual haynes weber carburetor manual pdf haynes weber zenith stromberg and su carburetor manual livre haynes weberzenith stromberg su carburetor manual weber carburetor haynes weber zenith weber 3236 manual weber q user manual weber workshop manual weber tuning manual weber factory tuning. Make sure all components of the ignition system timing, plugs, points, and wires are properly adjusted and working well, and that the valves are adjusted to specification before trying to adjust the carburetors. Why did triumph move from amal to su and then revert to amal.
Preparation setting up and tuning an su carburetor is based on the premise that both the engine and the carburetor are in good shape. These very distinctive solid brass items for su carbs, will make your engine compartment. Pdf catalogue page 107 the following parts are available in this group. Carburetter company limited also manufactured dualchoke updraught carburettors for aeroengines such. This second paper deals solely with su theory and tuning, the latter being the ultimate.
Often underrated, it offers versatility and reliability due to being analogue and the vast array of needle profiles available. It consists of a single jet in which a tapered needle operates. One carburetor draws far more air than the other make sure the pistons are moving freely, and when dropped hit the bridge with a distinctive clank. Some sus also have exhaust emissioncontrol devices to comply with antipollution laws. Failure to follow these instructions, including the pictures may result in subsequent system failure. On some su carbs, enrichment of the mixture when accelerating is provided by a. Apr 25, 20 this one is on my honda xl100 1974 classic honda style, but is the same, for classic and new yamaha kawasaki suzuki and all small bikes pretty much. Jul 03, 2012 haynes su carburetor manual pdf products and names mentioned are the property of their respective owners. This book is for those people who wish to tune su carburetors themselves, irrespective of how many carburetors there are on the engine or what type of engine it. As you open the throttle,more of these gnomes are allowed out of their house and into the float bowl, where they fill the buckets and climb up the carbs.
Construclion and functioning of basictype carburetter. The variable choke venturi allos an increase or decrease in choke vnturi size depending upon throttle plate position. Su su carburettor photos and information posts welcome to the relaunched carb. Ive been meaning to write this up for some time, ever since i did the su performance tuning 101 a few months ago. When all the carburetters have been checked and any adjustment made, it is necessary to recheck because of the influence of each carburetter on all cylinders. Tuning su carburetters published in 1968 by speed sport motor books.
The su carburettor high performance manual speedpro series hammill, des on. Righthand steered 1800 cars are also fitted with this type of carburettor. These instructions must be read and fully understood before beginning installation. Tuning su carburettors even though a large proportion of modern motor vehicles are now equipped with s.
These photo collections of carburetors are jobs that we have done, and pictures we have received of various carburetor installations and assemblies. The carburettors arrived from su in boxes, already set on the mixture bottom jet nut, with only. Tuning the su carburettor on the tseries mg totally ttype 2. Setting up and tuning su carburettors tools screwdriver spanner adjustable spark plug spanner jet adjusting spanner early cars carburettor damper oil length of tube or hose carb balancer optional the su carburettor is a simple design proven to be very effective. Su carburetors are marvelously simple devices that work wonderfully well, despite everything you have heard or even have experienced on old, wornout british cars that are decades away from the condition they were in when they left the factory. This detailed manual provides the techniques required to achieve the. In the right hands they can perform better than early versions of computer controlled systems. It was partly nationalised in 1975, when the uk government created a holding company called british leyland, later. Being an oftvoiced question on the message board, i thought id share it with you. Tuning tips once carburetors are reassembled and installed on your car, it is now necessary to properly set the idle and mixture adjustments. This selfadjusting nature makes the selection of the maximum venturi diameter colloquially, but inaccurately. Do you have a question or comment about this article. 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 manufacturers tuning data.
See tuning single carbs for the possible effect on engine r. Before proceeding to synchronize your carburetors and for best results, some preparation is in order. Carburetor tuning carburetor tuning means adjusting the screws that let in different amounts of air and fuel. Tuning your carbs need help figuring out which skinner union su needles you need to keep your car running right in all throttle conditions. The mixture strength of each carburetter should be checked, one carburetter at a time, by the method previously described in the section on tuning single h type carburetters. After years of resisting the temptation to rewrite the shop manual, i am posting this by popular demand. Now its a bit difficult to drive with all the flat spots and im worried about how ill get there. It has only one jet except in a few special types and very few moving parts. Car is running super rich and i need to go to vic roads on monday to get inspected. When setting the idle on multiple carburetor installations, it is far easier and more accurate to use a carburetor synchronizing tool, such as.
Checking and cleaning an su carburettor how a car works. Su midel for all your su carburetter requirements su. This one is more like basic su adjustment for happy driving. Setting hs4 carburetters comparison of two manuals by gerry threlfall ah workshop manual 1. Bring operating temperature to the normal running temperature, turn off engine 2. The right sized jets, needle positions, and float settings will ensure there is no fumbling or flat spots from idle all the way to wide open throttle. As many of you know im sortof fond of the longform video. Su carburetor is an example of a constant vacuum type of carburetor. Haynes weber carburetor manual pdf haynes weber carburetor manual haynes weber zenith stromberg and su carburetor manual livre haynes weberzenith stromberg su carburetor manual haynes weber zenith weber workshop manual weber q user manual weber tuning manual weber factory tuning manual 4g carburetor manual suzuki f6a carburetor manual pdf. Performance solex carburetors are identical to the standard solex, except for a larger diameter and a larger main sprayer. Unlike other types of carburettor, which have fixed jets, the su has only one jet, so the mixture setting affects the engine throughout its speed range. The method in principle could be used for most su carburettors including the mg ytype or the mga or mgb. The b 20 b engine in the l20 and 140 models is fitted with two horizontal carburettors of type su hs 6. The design of the exhaust system is dominated by considerations such as refinement and, of course, emissions legislation.
Skinner union carburettors, many motor mechanics still encounter difficulty when tuning and adjusting these relatively simple units. I cant get in with the guy that built them until the 2627th, if he can. Slacken the actuating arms on the throttle spindle innerconnection. This second paper deals solely with su theory and tuning, the latter being the. Su carburettors are a brand of carburettor of the constantdepression type. The following should be checked on the engine prior to setting up the carburetor to determine if the situation will lend itself to optimal timing, or. The td and tf have only one control knob combining both functions. Since there is already a very good source of starting pointsapplications for fixed needle carbs, this is for those floundering about in the wilderness that is the biased swinging needle example of the breed. But they also see an engine they think is almost impossible to tune, is not very reliable, and will overheat at the drop of a. There is a haynes manual for su carburettors but it seems to be out of print with the publisher.
Follow the instructions in the tuning guide for establishing a base line, make sure linkage is loose and reset idles making sure that the fast idle screws are clear of the fast idle cam. Comments on su hs4 carburetor tuning did you find this article useful. Tuning su carburettors including full needle charts, 1968 speed and sports publications ltd acorn house, victoria road, acton, london w. Stock info sufficient stock low or 1 in stock out of stock. The idiots guide to tuning su carburetters there are four distinct phases to tuning su carburetters carbies.
The su carburettor high performance manual speedpro series. Instead, go study one or more of my posts on su rebuilding, starting with. Also check the level of oil in the dashpot the domed piston chamber at the top of the carburettor. Carburer means to combine with carbon compare also carburizing. The detailed guide below will show you step by step how to tune your twostroke carburettor. That book is an excellent resource in its own right and is distributed widely on in the internet as a pdf. Clean, smooth acceleration happens when all components of the carburetor are clean and tuned properly. Skinners union carburetor provides precise control of both air flow and gasoline flow, according to the needs of the engine at that moment. The carburetters usually have a separately operated mixture control called an air valve, for use when starting from cold, and until the engine is warm. It is long since out of print but you may find one via specialist book dealers or on web auction sites. It is assumed that your carbs have been properly rebuilt and the jets centered.
Your carburetors should be in peak condition with no play in the throttle shaft bushings. British leyland was an automotive engineering and manufacturing conglomerate formed in the united kingdom in 1968 as british leyland motor corporation ltd blmc, following the merger of leyland motors and british motor holdings. Su carburetors owners workshop manual by don peers. It is essential, particularly where vehicles are equipped and tuned to comply with engine emission control regulations. This site consists of a compilation of public information available on the internet. This is intended to grow over time to become a very useful resource for all models of su carburettors, as fitted to many british classic cars such as jaguar, mg, morris, austin, and more. Looking for improved performance from your su carburetor.
Xk 120 service manual the factory wrote some things in a more clear. These pictures should be used to show correct linkage, and general identification of carburetors. Carburettors and was published by speedsport motorbooks in 1968. The solex carburetor that was used on the l4 series has a smaller choke 19mm and jets than the previous solexes 22mm choke. Leave a rating or a comment below, and get instant reply notification via email if you have a long question, or a question not directly related to this article, please start a new topic in the discussion forums. Su carburettors can theoretically perform better than modern computer controlled fuel systems. Gday, did a bit of a search around this morning for info and i need a bit of help with the sus. This design of carburetter offers perfectly simple and effective tuning facilities.
Fixedjet carburettors are easily blocked by small dirt particles and chemical residues from fuel, because some of the jets are very small. The area of the throat is varied by means of a piston which slides up and down. Pdf owner manuals and user guides are not affiliated with the products andor names mentioned in this site. The b 20 b engine in the 1800 model and in cars intended for usa and canada is fitted with two horizontal. It is very reliable, but it can become dirty and choked and some parts wear out. Su carburetor working of su carburetor the engineers post. This is a serious mistake as su carbs, once properly adjusted, seldom get out of adjustment. Tuning includes mixture adjustment, idle speed adjustment, and synchronization.
This book is for those people who wish to tune su carburetors themselves, irrespective of how many carburetors there are on the engine or what type of engine it is. Jan 15, 20 wowmore details in this than any of the other weber manuals i have bought or found on the web. Technical editor back to basics, for those of you who are fairly new to the register and tso, is a series of articles designed to help the. Su carburetters are the worlds sole manufacturer of genuine su carburettors, fuel pumps and spares.
An oildamped piston rises and falls according to engine vacuum throttle opening and load. Adjustment of these is described in adjusting an emissioncontrol carburettor. This book explains how to set up carburetors and choose needles for any application, and how to test the engine to make sure that the induction system is tuned for optimum performance. Covers tuning tips and techniques for su carburetors as well as all su fuel pumps for numerous classic cars, including the mini cooper, sprite, bentley, jaguar etype, jaguar mk 2, daimler v8, land rover, mgb, rolls royce, tr4 and tr7, spitfire, rover and volvo 1800. Balancing hif su carburettors by colin jones not having a go at your technician but i trained many of them when i was at bl who did not really understand the tweaks. Feb 10, 2020 why did triumph move from amal to su and then revert to amal. An excellent reference on most all su carbs, covering the theory, rebuild and tuning instructions is the su carb tuning tips and techniques by g r wade, brooklands books moss sells it i think. Charles bishop i originally wrote this up to assist a fellow xker in adjusting the su s on his jag i received about a halfdozen requests to be included in the offlist mailing please note.
Before tuning the carburettor, carry out all the checks in checking and cleaning an su carburettor, and bring the engine up to normal working temperature. The first is to set the fuel level in the float bowl, the second is to centre the needle in the jet, but only with fixed needles, not spring loaded ones, the third is to balance twin carbies. This is a home brewed tune up procedure written in laymans terms for the doityourself mechanic with a limited tool inventory. If after resetting idle, one carb still appears to draw more air, you most likely have an internal engine problem. For the h4 carburettor the position range is p1 to p10. I am getting ready to set up my 45dcoes for a new engine, this should be very helpful. Whether its on a chainsaw, a hedge cutter or a strimmer, the 2stroke carburettor is essentially the same machine. Instead, go study one or more of my posts on su rebuilding, starting. This is due the su being analogue and the vast array of needle profiles available. Before tuning the carburettor, carry out all the checks in checking and. The design was in quantity production for much of the twentieth century. Many people think that the exhaust system on a modern jaguar is a little too quiet for a car with high performance pretensions and it is quite possible to obtain a reasonable increase in performance allied to a pleasing exhaust note without becoming an antisocial monster.
The oil is there to slow the movement of the piston. Setting up and tuning su carburettors classic car hub. Part 1 chapter 2 and part 2 type h, haynes publishing. The su carburettor is a simple design proven to be very effective. Don jacksons opinion is that the standard es needle for the t series is far too rich and the eu is better. This is in fact the 5th edition of a book that was originally titled tuning s. A few years back, a genius over at developed a handy charting and searching tool for just that purpose. It is as sensitive to dirt and sediment as any fixedjet carburettor, and needs careful cleaning about once a year.
Tuning a carburetor equipped supercharged engine whenever people see a carburetor equipped supercharged engine in a hot vehicle, they cant help noticing how impressive it looks, and they wonder how much power it produces. Su carburettors the su carburettor is a relatively simple design but has proved to be very effective. Following is as basic a description of whats going on that i can manage. A carburetor american english or carburettor british english is a device that mixes air and. If this manual is not fully understood, installation should not be attempted. Even though the su carburetter carb is a very basic yet precise instrument, some fundamental understanding on just how it works is needed to be able to deal with common problems and tuning. Su tuning tool kit moss motors item click here for pricing and description this handy kits lets you check float levels, synchronization, mixture, and even centers the jet for su carburettors. Basics of carburetor operation the basic secret of carb function is that inside each carb are thousands of tiny gnomes.
Tuning of carbs is confined to correct idle settings 3. They should be removed from the engine for cleaning. Oct 04, 2015 today i will discuss tuning of su carburetors. The often underrated su offers good versatility and reliability. This variation of choke venturi size maintains a constant air velocity over the jet hence allowing a constant depression over the fuel supply at any.
842 546 594 788 34 1202 1544 1073 594 36 1377 1390 104 1453 1009 353 1100 1193 538 591 877 486 530 1257 977 382 66 1224 444 799 698