that the accelerator pumps are being actuated at the same time. Assuming solid, the procedure for moving the shaft isn't clear. Make sure your timing isn't too far off. Excessive pressure will cause the inlet valves to leak excess fuel. The adapter lets you mount the synchrometer on top of carb so you can have your hands free for adjustment. balanced for the idle circuit fuel flow. If you don't start with the Volume Control Screw https://www.bonfire.com/store/sladesbeetle/For A Members Quality Sticker: You dont have to do anything special to be a member, just be subscribed to the channel \u0026 grab your members sticker! Back off the dashpot another turn and repeat the rpm test. a starting point, turn the larger Bypass Screw whichever way All product names used on this site are trademarks of their respective companies, and are used with permission. both Volume and Bypass screws in the side (the earlier ones Taking the average as 4% this translates to an AFR of 13:1. sitting at the bottom of the stepped cam.). accelerator pedal. If the timing is advanced too high, detonation and/or pinging will occur and damage the combustion area in the cylinder head. These devices are there to prevent a run condition on after the engine has been shutoff. If not, replace the Solenoid. using the double vacuum distributor (first introduced in Look at the distributor casing and you will see a set of numbers stamped on the side of this casing. The engine may make less peak power, but you will out accelerate the same engine with larger carburetors (you have more power across the rpm band)! the engine idling and the vacuum lines connected so the 1. This has the effect of starving the carbs of air and stalling the engine. Carbs 103: How to Synchronize Dual Carburetors. the stepped cam rotates and the Fast Idle Adjuster is SOLEX 34 PICT/3 Carburetor Adjustment Procedures Basic Tuneup, and Adjustment of the Solex 34 PICT/3 Carburetor This method will also work for the 30PICT/3, 30PICT/4, 31PICT/4, 31PICT/3 and H30/31 carburetors with the two adjusting screws in the left side. the bottom of the stepped cam. maximum advance with the engine at 3000+rpm, and let the idle These could be anywhere, but here are the most common areas to inspect and correct: a) Vacuum Hoses running from the Carburetor to the Distributor Vacuum Advance/Retard Can check to see if the Advance/Retard Diaphragm will hold a vacuum. If you can move the adjustable rods, get some grease or never seize on it ASAP! Next Idle Adjuster Screw in more will increase the idle speed, It idles a little high and runs good. 8. Stock fuel pumps can produce more than 3 1/2 lbs of fuel pressure, so in some instances, a fuel pressure regulator will be necessary. by Steven J. Jackson Tue Apr 19, 2011 12:37 pm, #2 Please make sure that the Fuel Pump is in good working order. I have several of the solenoids This can cause What if the Application shown for your distributor isnt the same as what youre supposed to have? More to follow but it's not a critical step compared to the others. If this tube is missing, it will have to be replaced. Communicate with some of the IAC dual carb adjustment survivors here and elsewhere. On the top of the Carburetor Base, there is a vacuum fitting at a 45 degree angle. setting, as an early attempt at emissions reduction. Before we begin to adjust the carburetor, the valves, points, can now use the Bypass Screw (read on) to set the idle speed The first two are junk (see note below) but the Walker kit is good. time and make sure the RPM drops an approximately equal amount for If you use blue Loctite you may pull a head stud later so be prepared for that. This cookie is set by GDPR Cookie Consent plugin. the vacuum line disconnected). In fact I recommend that you use a good blob of green Loctite on those bolts after the tuneup. Thanks Satchmo. The first is the Carburetor, the second is the Ignition System. 8. Post setting the timing, it's the DISTRIBUTOR design which I like to use a German made synchrometer from STE. If you cannot raise the idle without bottoming out the speed screw, then the stop screws on each carb linkage are keeping the throttle plates open too far. See Bentley for photos. throttle arm, which has to be set exactly right. I turn the engine off and activate the throttle by hand. Nearest I can figure is copy each picture to my desktop and then paste back into the document, carefully resizing as I go. Valve I adjust ed the mixture and idle and it runs ok, but has some popping still. These cookies will be stored in your browser only with your consent. One other thing I have found with the dual careful, you don't want a shoe full of oil) and check that This is also a web link so that when you click it, youre automatically taken to that distributors parts list and timing specifications. I finally removed it, put a washer over it, and In fact, the most time consuming part of adjusting a set of dual carburetors is removing and reinstalling the linkage and air cleaners! Before you can make adjustments you should become familiar with the features and controls on these carbs. You want to match the intake airflow from side to side on the engine. Years ago, we wrote a tuning manual for Kadrons in hopes that it might help people get their Solex H40/44EIS dual carb sets running in tip-top shape. 2, removing 50- 565 13 12 14 27 21 10 45 35-- 46 d 0/47 42 22 34 19 15 22 18 29 32 16-0 26 25-n 24- 23-g 36 131- 56 idling control screw The figure shows a starting device for the Solex carburetor. air to the idle circuit. After making sure that the idle is set properly, you can take a small flat blade screwdriver and CAREFULLY turn it Clockwise until the idle just starts to stumble. The entire rebuild process can be seen here: See the photos from my rebuild ->www.ratwell.com/dotmac/Sites/Parts/PhotoAlbum80.html. We serve the VW parts and VW Tech needs of owners of aircooled Type 1 VW Beetle, Karmann Ghia, Type 181 Thing, Type 2 Volkswagen Bus, Type 3 VW Squareback / Fastback / Squareback, and Type 411 & 412 Volkswagens. What does happen though, is that the engine changes, and carburetor adjusting is needed to get back to a perfect setting. Thank you! Once it misses, turn the screw back out until the cylinder fires properly again. 35mm Dual Solex Carburetor Kit Vw Type 1 Air-cooled Engines If these screws are 3. screw out much outside the range of 2-3 turns (1/2 turn That includes Two adapters and a set of matched synchrometers could run you $120 or more. by Steven J. Jackson Wed Apr 20, 2011 6:31 am, #6 New Fuel Hoses are always recommended when installing a new Fuel Filter, Fuel Pump or Carburetor. Post Start bus. It does not close the throttle plates. The cookies is used to store the user consent for the cookies in the category "Necessary". STE recommends the BK with flat bottomed adapter for solex syncronization on all VWs with Solexes. Now You want both carburetors to have identical throttle positions at all points (NOT just idle). using the Bypass screw without touching the screw on the 2.) Older ones are light green and really old ones are yellow. This step, syncing the fuel flow, can only be performed after the air flow has been synced. holes/gaps in the manifold or at any of the connection 3. Loosen the lock nuts on the linkage (leave the ball-joints connected at either end), and thread the rod one way or the other. The synchrometer has a scale and a needle that deflects as air flows through it. isn't too far off. The cookie is used to store the user consent for the cookies in the category "Performance". On H30/31PICT models, the Fuel Dump Tube should be positioned so that a shot of fuel expelled from this tube is made straight down the carburetor throat, especially so that it is unimpeded by the Lower Fuel Discharge Tube near the center of the carburetor throat. the engine some more to make sure it's thoroughly warm, and back to the larger Bypass screw again to reset the idle Vendor Announcements & New 356 Products, Website / 356Talk Forum News and Login Help. adjustment is always done with the engine stone cold. If the gap is too wide, the idle will be too fast. WARNING! and the lower (smaller) one is the Volume Control Screw - not - in that case skip this procedure. Slowly attaches to the crossbar (don't grab any part of the crossbar 1. We also use third-party cookies that help us analyze and understand how you use this website. thanks. After the engine is fully warmed up, adjust the idle with a screwdriver at the large Air Bypass Screw on the left side of the Carburetor. We recommend setting the idle mixture screws at 2 turns out from the bottom as a general starting position. 5. Before setting the Volume Control Screw per the step below, Be very careful during assembly that you get it right. the Bypass Screw, to the point where you may have it turned Look at each carb while you move the cross bar or raise the idle with the dashpot reinstalled: both linkages should move at the same time. The Use two 8mm thread (13mm hex) nuts along with two 8mm ID flexible lock washers (also called wavy lock washers). screw alone. the 30PICT/3, the 31PICT/3 and the H30/31. vacuum line disconnected). Although there are timing specifications to follow on certain distributors, here are some basics to follow: a) Single Vacuum/Mechanical Advance Distributors (SVDA) are usually timed at 7.5 Degrees BEFORE Top Dead Center with the Vacuum Hose disconnected and plugged b) Dual Diaphragm Vacuum/Mechanical Advance Distributors (DVDA) are usually timed at 5 Degrees AFTER Top Dead Center with BOTH Vacuum Hoses connected. It does not store any personal data. does not use them. If you have any comments or questions, feel free to give us a shout. 1. Who knew a new distributor could fix carb problems? you don't want to open up the hole. Another dual carburetor tip: It would be good if your carburetors have a throttle STOP (full throttle) also, so the butterflys or carburetor arms do not get bent if they are opened too far. The Weber ICT has a non-round top, and requires an adapter to connect without leaks! As by Sluggo Fri Sep 29, 2006 10:08 pm, Post The starting position is 2.5 turns out for each screw from the bottom. When I first tried to start the bus I poured 1 gallon of fuel into the tank. Although it's no where near as good as the snail, the Chinese copies are so poorly made you'll have a hard time reading it at all because you'll find the opening has to be almost completely closed to obtain a reading in the air chamber. turn the Bypass Screw (the larger screw in the left side) out 2.5 As part of the rebuild of a 72 engine I had to make sure the carbs were operating correctly. Rimco is such a company that can re-bush these carbs. This website uses cookies to improve your experience while you navigate through the website. The Bosch number set is the best guide as to the distributor you have to determine proper timing. This is because when you put the tool on the top of the carb throat, it creates a high vacuum condition that sucks through the air circuits (which are NOT being choked), and this pulls a ton of fuel in that is normally not metered. This way the idle speed can be set correctly usually have a little less advance. On left carb, turn in the side idle turn. 31PICT/3 and H30/31 carburetors with thetwo adjusting This is done using the Volume Control Once you get the mixture right, Bentley recommends syncing the mixture between the carbs by disconnecting the leads from the pilot cutoffs (not the central idling cutoff) one at a time. If it isn't, run Now screw it in another Note: Back off the Fast If the rpms drop then the circuit is having an effect. Necessary cookies are absolutely essential for the website to function properly. by Amskeptic Fri Jun 23, 2017 1:06 pm, Post If the engine detonates/pings at this You also need both carburetor adjustments to be unaffected when sitting at idle position (same carburetor position with linkage attached as when it was disconnected). At idle it takes a bit for fuel to get flowing, or stop/evaporate, dont be in a hurry. the choke butterfly valve in the throat of the carburetor Connect the Accelerator Cable at the Barrel Nut Assembly in the Throttle Arm. by airkooledchris Fri Feb 04, 2011 6:04 pm, Post On 34PICT models, the Fuel Dump Tube should be positioned so that a shot of fuel expelled from this tube DOES hit the Lower Fuel Discharge Tube so that the fuel stream splatters and is partially atomized in the airflow of the carburetor throat. This is set Once you have the Bosch number, you can go online at http://www.oldvolkshome.com/ovhignbo.htm and check the list of distributors shown in Bosch number order. As you turn out of the screw you enable more fuel to flow past the needle (rich). either the mixture screw overtightened or a bad shutoff Now, when you put the Uni-syn on the top of the carburetor (one throat), you need to rotate the disc (that is on the threaded piece) up or down to center the piston in the glass.
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