su carb drop test|su carburetor piston : purchase Hi, I tried the SU piston drop test that measures the time for the piston to fall in the air dome. The application is my 1960 TR-3 with H6 Carbs. The time for the piston to drop .
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When you have multiple SU carbs on your engine it is vital that the right piston goes to the right dash pot. This test is commonly knows as the drop test and. Hi all, Just perhaps a silly question about correctly performing the carb piston drop test with SU carbs. I cover the holes in the pistion with masking tape, but do I have the .When things are worn and the engine is badly tuned (you know – “The carbs are messed up”, spoken without having first done a compression test, replacing the burned points or .
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The pistons should pass the suction chamber drop tests at the same rate: 3-5 seconds for a 1-1/4" and smaller carburetor 5-7 seconds for a 1-1/2" and 1-3/4" carburetor. The . The pistons should pass the suction chamber drop tests at the same rate: 3-5 seconds for a 1-1/4″ and smaller carburettor. 5-7 seconds for a 1-1/2″ and 1-3/4″ carburettor. The throttle shafts should be secure in their bores .
Hi, I tried the SU piston drop test that measures the time for the piston to fall in the air dome. The application is my 1960 TR-3 with H6 Carbs. The time for the piston to drop . This is a standard mixture test, performed AT IDLE: Under operation, (air filter off) lift the carb piston by 1/16" with the lifting pin or a screwdriver, which leans the mix a tad. If: RPM's rise and stay up, that carb is . Remember, drop speed is tested with the pressure communication holes in the bottom of the piston plugged. The center, hard cylinder is both the damper oil chamber and .
As the air and fuel pass through the venturi's narrowed passageway in a carburetor, the mixture speeds up; the resultant drop in pressure is what causes the fuel to atomize. The SU employs this principle . The SU parts catalogue lists the correct dashpot/damper/valve through all MGB fitments, HS or HIF type carburetors, to be AUC 8114, What is more important is the piston to .
The following is a simple step-by-step guide for tuning your SU carburettors using a different method from that usually suggested in the various books published by BMC, Haynes, SU or Burlen Fuel Systems. . This is a . HD8 vacuum drop test Hello all, When performing a vacuum drop test with the HD8 carburetor piston and suction chamber, how many seconds should it take. Home. Forums. New posts Rules. . Wanted HD8 SU carb set: Austin Healey Classifieds: 6: Aug 30, 2017: Colortune for HD8 Carbs? Austin Healey: 55: Jul 3, 2017: B: mysterious leaking of SU HD8 .The SU damper is intended to slow the piston rising, to enrich the mixture when you boot it, but should then drop easily back down with little or no damping. Top up the oil in the dashpot and see if you can feel the damping resistance when you try to lift the pistons; as long as that’s okay it’s no problem that the piston drops down.FOR DECADES SU carburetors have fueled a wide range of British vehicles including MG, Austin-Healey, Jaguar and even Rolls-Royce. . Obviously,triple-carburetor installations, like those on the big Austin-Healeys or Jaguars, will be more complex in their final assembly on the car. There are many fine books and online sources that can help with .
The Worlds Sole Manufacturer of Genuine SU Carburettors, Fuel Pumps and Spares. BURLEN; SU; AMAL; ZENITH; AUSTIN PEDAL CARS; SKINNERS UNION CLOTHING; TEL +44 (0)1722 412 500 . Our works restoration department can restore your SU carbs to as new condition. Take a look > The World of SU. I have two HD 6 carburetors in my XK120 ( not original, I understand). The engine always runs rich in spite of adjusting carbs to as lean as possible. So I tried the dashpot “drop” test (inverting dashpot to see how long it takes for it to drop off the piston, per Jaguar maintenance manual) and mine drops too fast. This suggests too much clearance between .
The needle valves had a black viton tip, and the one in the rear carburetor had been sticking closed when the car sat for long periods of time. I noticed that the black viton tip in the rear carburetor had a ring of wear on the cone, so I replaced both needle valves and seats with new SU-brand steel-tipped needle valves/seats. 8.
The aluminum SU carburetor body has some nice abrasive on it, commonly known as aluminum oxide, which will cut into the soft brass shaft rather nicely, if given the chance. Meanwhile, as the aluminum oxide cuts into the shaft, the aluminum carb body itself doesn’t wear much at all, so if you were to put a new shaft into that old carb body, it .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. Some SUs also have exhaust emission-control devices to comply with anti-pollution laws. Adjustment of these is described in Adjusting an emission-control carburettor. Before tuning the carburettor, carry out all the checks in . This is a standard mixture test, performed AT IDLE: Under operation, (air filter off) lift the carb piston by 1/16" with the lifting pin or a screwdriver, which leans the mix a tad. If: RPM's rise and stay up, that carb is rich. RPM's rise briefly, then drop, mix is about right. RPM's fall, engine gets rougher - mix is lean.
I did the piston drop test on the rear carb. The manual says 5 - 7 seconds - this one took 3 seconds to drop. There are some minor score marks on the inside of the rear carb suction chamber. Could this be the problem? . Complete SU carburetor sets available for RB retro-fit. SU's bought, any condition. [email protected] 214-686-8692 https .To tune SU carbs, first locate the following components: . If the exhaust note rises and stays high till you drop the piston, this carburetor is adjusted too rich. Turn the mixture nut one flat (one-sixth of a turn) up, moving the jet toward the bridge, then repeat Step 4. . Replace the air filters and go for a test drive! Notes SU .The Inspection page for the SU Carburetters website. Back | << Previous | Next >>. HS Type Carburetter: Inspection. 1 (a) Examine the throttle spindle and its bearings in the carburetter body; check for any excessive play, and renew any parts as necessary.
Remember, drop speed is tested with the pressure communication holes in the bottom of the piston plugged. The center, hard cylinder is both the damper oil chamber and keeps the suction chamber perfectly centered. That's why it is important on two lug SU (such as the HS2) to maintain the orientation of the suction chamber to the body. SU Carb piston springs. Jump to Latest . You can do the 5-7 Second drop test to see how evenly the two carbs are matched, but my advice is not to change anything without a very good reason and an equally good understanding of what results such a change are intended to bring. Finally, and in no uncertain terms: NO ABRASIVE OF ANY KIND .Simple Carbs: Rebuilding and Tuning an SU Carburetor (published online by Classic Motorsports 19 July 2021) By Carl Heideman No matter what the name on the valve cover, so many British classics rely on the . the resultant drop in pressure is what causes the fuel to atomize. The SU employs this principle differently because it varies the size .
Is there any sort of reference for spring rates by color code for SU carbs, like the wire color code? . Measuring the spring rate is another question. I'm guessing you'll be fine as long as the drop rate on both carbs is fairly .
SU Carburetor butterfly closed When the engine speed is constant the air velocity (vacuum) past the jet is directly proportional to the volume of air passing between the bridge and piston, ie. piston height regulates the air speed over the jet, and piston height is . In this video we explain the 3 most common things that can go wrong with SU Carburetor floats.
After adjusting my throttle linkage to get full opening of the throttles, I noticed an issue where the idle speed doesn’t drop down to where it should be when the throttle is released. I think it was doing this before I adjusted the linkage, but I was driving the car so little, I didn’t really pay attention. On startup, idle is around 600 rpm indicated. Upon blipping the throttle or . So using the piston lift test, I've been turning the nuts to richen, one flat at a time. Lift the pistons again and repeat. I've done this dozens of times. Yes, I've turned the nuts to richen the carbs probably two full turns at this point. And STILL the rpms drop and the engine wants to die if I lift a piston."SU Carbs - Over 100 years old & still going strong" SU Carbs have played a significant role in the history of British motoring & has continued to be the carbs of choice for many vintage & classic car enthusiasts. Depending on the carb model they can be of brass or plastic. This is there to keep the piston face from COMPLETELY shutting off the air flow over the bridge. Once the pistons move well, remove the needles and install the pairs back onto the carb bodies. Now see what you have in the way of "drop".
Not sure what a drop test tells you about the oil level. Or is that what you mean, it's resisting movement at first but then it's gone and after a few strokes the piston lifts easily? If things are heavily worn out in the piston and dashpot assembly, you can suck the oil out with vacuum, maybe. The drop test has to be done with the dashpot/air piston off of the carb body (throttle body), held upside down, air holes on bottom (either side of needle) plugged with tape, clay, something air tight, and the inner return spring and air piston damper rod removed. Again, this is just a checklist to help you track potential issues within or around your carburetor. Some of the conditions can be fixed by simply adjusting the carburetor; others require you to remove and disassemble the carb. Here are some quick checks you can make to ensure many aspects of your carburetor are operating properly: Quick Checks
Just wondering if anyone has tried anodizing the SU carb piston to accommodate a better tolerance on warn out pistons with a specific micrometer thickness. Haven’t read anything was just brainstorming on ways to make it work. . I didn’t blast the internals but one of them settles quicker when doing the drop test - about 12 seconds instead .
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su carb drop test|su carburetor piston