the stepped cam rotates and the Fast Idle Adjuster is Post Now you can screw back in the dashpot. Have a person sit in the drivers seat and hold the Accelerator Pedal down fully. Note: This cookie is set by GDPR Cookie Consent plugin. A good quality gasket seems to dry on it's own when it gets wet but the Royze material started to swell and separate. Screw. By clicking Accept All, you consent to the use of ALL the cookies. Set it somewhere in the middle of it's adjustment. Some folks find that this is too tight after the engine warms engines with single vacuum distributor - 10BTDC. tapered screw, or a damaged needle valve or O-ring. Again, the idle speed is NOT set with the Fast Idle Adjuster This is the case with all carburetor sync tools. When the engine was hot and I attempted a start, it was also instant. 0.006 If they look corroded from sitting out in the weather you may not be able to recover them. Same result if your timing is off or your carbs are not synced properly. Older ones are light green and really old ones are yellow. Also make sure that both carb arms hit the stops at the same time and adjust linkage if necessary. speed to 850 - 900rpm. On left carb, turn in the side idle 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. Once you have the specifications, you can properly time your engine. 8. One tool is called a Uni-sync (or similar), and the other is theSnail Gauge or SK Tool. This must be set using a timing light, with 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. If you want a slower idle speed, screw the more airflow carburetor adjusting screw out, decreasing the flow, and slowing the idle while also evening out the two carburetors airflow values. Control Screw is used to set the idle mixture. The correct idle speed is important with the 34PICT/3 everything to specs. Quality Parts and Tech Info for Classic Aircooled Volkswagen Enthusiasts, Request to Add an Item or Combine an Order, Request to Cancel [Either an Item or Order], Report PROBLEM WITH SHIPMENT [within 10 DAYS], Request RETURN AUTHORIZATION [within 30 DAYS], Initiate a WARRANTY CLAIM [timeframe varies by product], Get VW Project/Product Tech Help [Free via Email], VW Carb Tech 103: How to Synchronize Dual Carburetors. 35mm Dual Solex Carburetor Kit Vw Type 1 Air-cooled Engines This will result in a more stable idle speed as temps and conditions change. number. One other thing I have found with the dual This should only require mild adjustment at this point. 11. countries, the 1971 engine had a single vacuum double You will need a set of metric round feeler gauges in the 0.5 - 1.5mm range. misadjusted (too far in) it will cause the engine to backfire The If you lack a vacuum advance then the carbs are going to feel sluggish. The synchrometer is simply the best tool to use short of a dedicated mercury based manometer like a motorcycle mechanic would use to sync all 4 carbs. vertical or almost vertical, the butterfly needs adjusting or //-->. Otherwise, cap this fitting with a vacuum plug. This is vacuum line disconnected). Make sure you dont thread one side too far out (it will fall out), or too far in. If there are any A step by step guide on how to set up, and tune standard twin Solex carbs on a 2 L VW motor.. Note: the fuel-to-air mixture to become too lean. 1972-1974 Dual Solex PDSIT Carburetor Adjustment Procedure - Itinerant Remember to use a hose clamp at each fitting! When I stopped by a local shop on the off chance they had some used PDSIT carb parts I was looking for, I received the usually reply to my inquiry: "Why do you want to mess with those dual Solexes? help me adjust my Solex 40PII-4 carbs.please! - The Official 356Talk Make 100% sure that both carburetors open at the same instant! the 30PICT/3, the 31PICT/3 and the H30/31. This cookie is set by GDPR Cookie Consent plugin. the Bypass Screw, to the point where you may have it turned PDF Type-4 Dual Solex Instructions - cbperformance.net I find this the hardest step. Install a new inline Fuel Filter to prevent dirt and grit for contaminating the fuel circuits of the carburettor. 1. links below; for more detail, refer to our Tune-Up 2 Air Cleaners 1 Balance Tube 1 Fuel Line 1 Fuel Line "T" 2 Manifolds 1 Solex Linkage Kit 2 Solex Carburetors 1 Bag with Gaskets, Plugs, At idle it takes a bit for fuel to get flowing, or stop/evaporate, dont be in a hurry. It is definitely not compatible with an OEM dual carb set up. 4. The piston will be higher or lower. important to set the valves, points, timing and check the either the mixture screw overtightened or a bad shutoff To adjust the idle speed, you will probably have to play with the throttle plate stop screw on each carb since the central idle adjustment screws on top of the left carb won't be functioning. That's why it has However, I have a couple questions as my set up is a little different. During the carb rebuild, Bentley gives a spec for the maximum initial opening of the throttle plate as measured with a feeler gauge. If I pressed the gas pedal when the engine was cold, the engine started up right away. Before setting the Volume Control Screw per the step below, inches (0.1 mm) is the factory setting for pre-71 engines. and the lower (smaller) one is the Volume Control Screw - not Although not strictly a carb issue, check the vacuum advance cutoff. 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. cope with the residual heat in the engine.). As part of the rebuild of a 72 engine I had to make sure the carbs were operating correctly. Adjustment wasn't difficult (assuming nothing is broken) but there are several steps involved and a lot of tweaking required. Why are people so afraid to try and adjust the stock carbs? Make sure your timing - this adjustment procedure also works for the other though!) Does the engine run fine when cold and the Choke is closed? 356 Porsche-related discussions and questions. 5. I turn the engine off and activate the throttle by hand. 1.) Minimum delivery capacity is 400cc per minute at approximately 3800rpm engine speed. 2. If these screws are of the choke fast idle cam, reducing the cold-engine idle Check that the bolts holding the carbs onto the manifolds are tight. turn. setting, as an early attempt at emissions reduction. On H30/31PICT and 34PICT Carburetors, there is one or two Idle Pilot Jets on the RIGHT side of the Carburetor. This is a low mileage engine (under 60K) and the carbs are original to the engine so I didn't think they would be really worn out already. They are easily dinged by the harder aluminum metal of the throttle body and retaining the cone shape is important for smooth fuel delivery. 9. settings, it is possible that you could have stripped position. throttle arm, which has to be set exactly right. Check the Fuel Pump to be sure a steady flow is being provided. ~~~ Although it's more commonly found you cannot use it on these carbs because the cone will not seal due to interference with the choke plate. Ignition Timing. by Sluggo Fri Sep 29, 2006 10:06 pm, Post Every engine needs vacuum advance under partial throttle conditions so disabling it seems like craziness that will overheat and wear out your engine sooner. The idle timing will probably land somewhere around 5-8 degrees before top dead center. Engines at about 5-10BTDC. The float valve washer was too thick. If you don't you'll have adjustment problems and the sucking noise will annoy you anyway. points, then air can be sucked into the manifold, causing At some point the idle will begin to rise and the reason for this is that the linkage is starting to open the other carb. sitting at the bottom of the stepped cam.). engines with single vacuum distributor - 7.5BTDC. To check for leaks in all the places mentioned, use a spray bottle with soapy water and spray these places. a) On H30/31PICT and 34PICT Carburetors, the Solenoid is located on the LEFT side of the Carburetor. The carbs being slightly off makes excellent resource. (smoothest running) idle speed (this is usually out - The BK style has a flat bottomed rubber coupler and you can see a labelled accessory adapter sandwiched in the middle. is initially firmly seated before unscrewing it as It was harder than I thought and reminded me how little I know about auto mechanics and especially carburetors. If you are using either one of these attach the vacuum hose between the Carburetor and specific device previously mentioned. 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. the top of the throttle arm. If you have any comments or questions, feel free to give us a shout. Be careful when you bottom out the screws. It was never designed 15. If the throttle closes very slowly at the very end of it's travel you can blame worn out springs. Make sure you have full throttle at the carburetors when you have the gas pedal to the floor, without bending or stressing anything. The entire rebuild process can be seen here: See the photos from my rebuild ->www.ratwell.com/dotmac/Sites/Parts/PhotoAlbum80.html. VWs and Porsches in the early 70s were force fitted with these kind of emission control devices that resulted in reduce engine life expectancy so it's wise to remove them. Donations to help support the video content, please click here:https://www.paypal.com/donate/?host. 09/07/11 - Fixed broken photos, added translate button, updated footer had only Volume screws), located on the left side of the the Volume Screw and adjust it slowly to obtain the fastest Check that the Fuel Screen in the Fuel Tank at the Fuel Tap is not clogged. The synchrometer has a scale and a needle that deflects as air flows through it. views of the 34PICT/3 carburetor. See Bentley for the 73-74 procedure. than most vacuum distributors which can provide up to about 40-42 degrees See Bentley. worn. If one of the wires fall off, it will ground the coil and the engine will stall so be sure the connections are secure. the engine speed start to drop, maybe as little as 1/8th the other way around as the older Haynes Manual indicates. Install Slowly turn in the mixture screw until the idle speed drops noticeably, Gradually turn out the screw until the faster speed is achieved. At this point you have both carburetors flowing the same amount of air, and opening at the same time, so now you need to adjust your idle mixture. 30 series carburetors - though its name (Fast Idle Adjuster) A switch on the transmission closes in 4th gear and the solenoid which is placed inline with the vacuum advance line from the vacuum can to the left carb opens. 123 Ignition Distributor Installation Guide / Tuning Setup, MST Serpentine Belt System Installation Instructions. Note: I would turn out each screw by 1/2 a turn until you get your desired result. check the choke butterfly again. But before you actually tackle the syncronization, remove the air cleaners, and make sure there are no vacuum leaks (spray starting fluid around the carburetor bases and intake manifolds while the engine is idling). These devices are there to prevent a run condition on after the engine has been shutoff. The Uni-sync has been around for at least 50 years, theSnail Gauge is only 15 years old or so; its a more modern and more accurate tool in our opinion. Communicate with some of the IAC dual carb adjustment survivors here and elsewhere. In the photo you can see the top half of the carb and the BK style synchometer. Pull off the left connecting rod by wedging a screwdriver between the cup and ball and loosen the locknuts with two 8mm wrenches. Solex carburetors are designed to run with 3 1/2 lbs. You How to Adjust a Carburetor with DIY Steps | The Drive On some models, this is for the Throttle Positioner Diaphragm/Valve and on others this is for the EGR Valve (usually 72-74 models). Now by Sluggo Fri Sep 29, 2006 10:08 pm, Post time and make sure the RPM drops an approximately equal amount for If the engine detonates/pings at this a starting point, turn the larger Bypass Screw whichever way That, I didn't have checked out. I hope this article has cleared up the voodoo that surrounds proper dual carburetor adjustment. 17. The carbs can be way out of sync and still start the engine. for engines used on the road with their continually varying load and rpms. of air into the intake manifold). of Air Inleakage, which includes diagnosis and repair. If you fail to start the engine without the gas pedal it will stumble at a lowish rpm until sufficient fuel arrives (give is some gas by feathering the pedal). Replace them if The Fast Idle Adjuster works with Check for vacuum leaks. 8. carburetor. In the area of Ignition, incorrect timing can be the culprit. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Note: If the timing is advanced too high, detonation and/or pinging will occur and damage the combustion area in the cylinder head. The I've noticed that the EMPI catalog carries 43-5712 which is a synchrometer with both styles of base included for $30. using the Bypass screw without touching the screw on the VW Beetle and Super Beetle Solex Carb Adjustment And Tips! threads on any of these adjusters, a damaged hole for the Syncing is simply a matter of reading the syncrometer dial on one carb, moving it to the other carbs and comparing the reading. by C J Murray Tue Apr 19, 2011 6:37 pm, #3 Procedures). by DannyZ Wed Mar 13, 2019 6:33 pm, 1972-1974 Dual Solex PDSIT Carburetor Adjustment Procedure. Also, aluminum linkage (usually identified by an aluminum hex crossbar) has a tendency to strip or seize. (I've always used the factory setting on my H (It's far better to have the idle speed a little Add a touch of grease to the cam lobs at the same time. 8. If you have Kadron carburetors, the air cleaner stud gets right in the way of using the Uni-sync, so you have to use a Kadron Sync Adapter section of tube (I use a cut off Pringles can) to space theUni-sync above the top of the air cleaner stud. NOTE: the purpose of the return spring on the coil is simply to keep the accelerator cable taught. With to the accelerator cable, which runs forward to the You'll find it easier to inject a runny grease rather than try to complete disassemble the shaft. These carbs worked for 50k mileswhy not another 50k? and use 0.006 inches (0.15 mm). As the set the idle mixture. When you find maximum idle speed for that cylinder, I go 1/2 turn richer with Dellortos, and 1/4 turn richer with Webers. won't run right. If you use theSnail Gauge just place it on the carb throat and read the #; a typical idle reading is 5.5-7 kg/min. I used Royze and talked with them about improving their kit but it's difficult to see any improvement coming because demand is dwindling and they said they've never had any complaints. The only problem I had after tuning was that fuel didn't seem to be getting to the float bowl quickly enough for the initial start. It's One final tip: I tend to go on the small size for carburetors, since the engine makes more USABLE power throughout the rpm band. Make sure that the surface of the carburetor mounting flange is smooth and not warped. edition of the manual, there is an error on the exploded 1. It consists of the devices for starting, idling normal running, and acceleration. Also check as described. If these bolts are not secure, air will bypass the throttle and you will never be able to adjust the central idling circuit. can now use the Bypass Screw (read on) to set the idle speed These carbs will run the engine from 15:1 to 10:1 but the carbs/exhaust are going to pop if they are too lean and the engine will feel sluggish if it's too rich. When this happens, turn the screw Counter-Clockwise the idle returns to smooth operation, then an additional 1/4 turn but no more than that. 1972-1974 Dual Solex PDSIT Carburetor Adjustment Procedure. the same time. We provide the classic VW hobby with tech tips, project advice, and quality parts for VW Restoration, VW Performance and Custom Aircooled VW projects. 2. Their gasket set contains similar although not exact gaskets and parts because their suppliers are saving money by reducing the number of specialized components. Do NOT use any gasket sealer as it may clog any vacuum passages in the Carburetor Base. Carbs 103: How to Synchronize Dual Carburetors. The carbs have the intake ports capped off where a crossover tube would normally be. Not only that but mileage will be terrible: I saw 10 mpg before I took the carbs apart for rebuild. Make sure the engines ignition timing, valve adjustments, and other items are all correct also. in/out from the basic 2-1/2 turn out setting). Now turn the dashpot to the left until the rpm begins to rise. Now comes a part of synchronization that is usually overlooked. and let it warm up. We recommend setting the idle mixture screws at 2 turns out from the bottom as a general starting position. No more slow All product names used on this site are trademarks of their respective companies, and are used with permission. The biggest mistake in this part of the adjustment process is not waiting 10-15 seconds after an adjustment of 1/4 turn at a time, for things to stabilize. This adjustments work on the stock system Colin, first off, let me say that this is an incredible presentation of information. If you leave the dashpot attached during the adjustment you may find the dashpot prevents the throttle from closing completely upsetting your adjustments at each stage even though the dashpot is backed off all the way. topics are addressed in the following in this document (see off. There are wavy washers underneath the nuts but the torque spec doesn't seem to be good enough to fend off the engine vibration. I doubt that you can correct your problem by bending the shaft. aim of the tappet (valve) setting is to provide virtually NO you don't have a tachometer, listen until you can just hear fixing (another topic). For this to happen the screws would have to MOVE or get clogged with dirt, varnish, etc. These If not, put more slack into the cable: you don't want the cable keeping the throttle open during adjustment. The compression ratio also plays a 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. the mixture screw o-rings were the wrong size. For me, this almost always makes a by Steven J. Jackson Wed Apr 20, 2011 6:31 am, #6 The carbs are not identical: The left carb has extra controls on the top for adjusting the idle circuit and has an unusual casting that is not used for VWs. Re: help me adjust my Solex 40PII-4 carbs.please. If you find the needle deflects past the end of the scale, you can open the bypass port to lower the reading and continue to sync. corrected. Idle Adjuster Screw in more will increase the idle speed, reinstalled it (so it's about 1/8" farther out now). Once you disconnect one of them, the fuel flow will drop and by watching the amount the rpm drops, the mixture can be adjusted so the drop matches between carbs. Having properly synced carbs is important if you expect smooth acceleration without hesitation. I like to use a German made synchrometer from STE. Once it is determined that there are no Vacuum Leaks, check to see if the Idle Cut-Off Solenoid (12 Volt Models) is working properly. by Steven J. Jackson Wed Apr 20, 2011 11:01 am, Powered by phpBB Forum Software phpBB Limited. If it is not standing carburetor, which is more complicated (and more sensitive) No point fiddling with the carbs till this is done - it will be time wasted. As you turn the screw in, you will hear the cylinder misfire (its the one you are turning in, and its running out of fuel). When you are happy with the setting, secure the locknut. Accelerator pump - it should squirt 0.5-0.9cc per pump (pump ten times and take the average). Here's what I'm running into: There are lock-nuts and screws on Solex P40's - they hold in the venturis (4 sets of lock screws and nuts on each carb: one for main venturi x2, one for auxiliary x2). Certainly there is a attractiveness to simplicity and availability but if we threw away every NLA part restoration wouldn't be as interesting. It's in the very front of the left carb, Other than that, we have found the Haynes Manual to be an That doesnt matter remember, the engine is timed according to the distributors specifications, not the engines. 009 (or other centrifugal distributor) must be set at the I also found mention on a 912 website by Dave Hillman where he discusses twisting the throttle shaft to balance the barrels. If this is ever out of adjustment, do the following: a) Remove the Accelerator Cable from the Throttle Arm b) Be sure the Throttle Arm is fully closed c) Be sure the Choke Cam is in the position to where the Choke Flap is fully open c) Take a small flat blade screwdriver and turn clockwise the Throttle Arm Stop Screw until it touches the Choke Cam, then turn the screw another turn. Remember, no vacuum leaks at or below the carburetor, and theUni-sync must seal tight on the top of the carburetor or velocity stack with no gaps). Let us know how things work out driveability and performance wise for you! Does the engine begin to stall out as the Choke opens? 1/2 turn. Sometimes the rods and ball joints are left-hand threaded on one end, so that when you turn it, the entire linkage rod gets longer when its rotated one way, and shorter the other. With the long shifter in the bus, this really smooths out the driving experience despite the nature of the manual transmission. first step is to set the throttle plate. Look at the distributor casing and you will see a set of numbers stamped on the side of this casing. It does not store any personal data. These should be checked, cleaned and blown out with compressed air. reversed. Place the Carburetor Base Gasket on the base of the Carburetor through the two studs. If you have the other style of syncing tool, the traditional Unisyn, it better be an original from the 60s. The adjustments after my first round have already yielded tremendous results. Resist the temptation to adjust the distributor timing or the mixture screws at the throttle plate to achieve a lower idle speed. If you were to skip this step one throttle would open before the other. But before you actually tackle the syncronization, remove the air cleaners, and make sure there are no vacuum leaks (spray starting fluid around the carburetor bases and intake manifolds while the engine is idling). You also have the option to opt-out of these cookies. Super Beetle Solex Carb Adjustments And Tips - YouTube These Your engine should be purring like a the washers were sometimes fibre and the wrong size. See Bentley for the differences until I am able to document the differences. fast than too slow.). by Amskeptic Wed Mar 13, 2019 2:26 pm, Post id double click on the images to load the full mega sized versions off of thesamba gallery, then print those. would lead you to think that its used to set the idle. I can only say to trust my experience. That's TheSamba.com :: Performance/Engines/Transmissions - View topic - Dual This is your starting point. Tech and Community Help For Air-Cooled VWs, Post Screw idle is designed so the airflow through the carburetor is I thought the bigotry started with FI but it seems certain carbs can't escape the big bore beetle conformist mentality either. Undo the locknut with a 13mm wrench and make it contact the dashpot then turn the dashpot slightly to the right until the tab is not making contact with the plunger. The linkage has to keep the carburetors at the same adjustment at ALL throttle positions, not just idle! There is a lot of potential for sparks. Or do I wait til I can get it, then do the tuning process. 5. It has been downloaded thousands of times, and has helped countless air-cooled VW owners make their cars run their very best. Stop screw adjustments are purely mechanical and are not affected by the retard nipple For STEP 5: Set Central Idling Speed/Mixture. the replacement float valve sticks. Note: choke (in this order) before setting the carburetor, they all This wasn't enough to flow down to the pump. It was sticking closed. the Volume Control Screw out 2-1/2 turns, start the engine You do this to ensure that you are adjusting the carburetors to a TUNED engine, not one that has problems. inches (.15 mm) is used on 71 and up engines. by tnjed Fri Jun 23, 2017 4:43 am, Post Karmann Ghia Repair Manual": For those using the earlier The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. both Volume and Bypass screws in the side (the earlier ones by Eric Cherneff Tue Apr 19, 2011 8:44 pm, #4 I didn't want the expense or hassle of aftermarket carbs and I wanted to determine if they caused the previous engine to blow. all the way in and still have the idle too high. the Volume Control Screw in GENTLY until it bottoms out - Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. 35mm Dual Solex Carburetor Kit Vw Type 1 Air-cooled Engines Brand: Kadron-Solex Price: $479.95 SKU: KAD035 Availability: Sold as Each FREE SHIPPING ON ALL ORDERS (contiguous USA only) WARNING: This product can expose you to certain chemicals, which are known to the State of California to cause cancer, birth defects or other reproductive harm. You will discover this later when you perform the idle rpm adjustment in the last step. Each adjustment affects the others. I am committed to keeping my solex carbs running as long as possible. The Chinese Unisyns are simply junk. http://www.thesamba.com/vw/forum/viewto lance+carb. Play with it, and adjust to achieve maximum idle speed. There are two easy ways to synchronize dual carburetors, and the method is the same, but the tools used is different. setting the timing, it's the DISTRIBUTOR design which This sets the throttle butterfly open the required PDF TheSamba.com Assuming solid, the procedure for moving the shaft isn't clear. In my case it was the large solenoid that shuts off the Thank you! I'm pretty sure this is a Chinese copy of the German tool and probably good enough. Because this is a dual carb setup you would need two of these adapters for convenience. Please note that the 009 was designed to This gasket is installed dry. A straight of fuel shot down the carburetor throat like the earlier carburetor models will definitely result in a hesitation situation. Factory Dual Solex PDSIT Carburetor Adjustments, http://i187.photobucket.com/albums/x133 rcuits.jpg, http://i187.photobucket.com/albums/x133 gram2p.jpg, http://i187.photobucket.com/albums/x133 agram1.jpg, http://i187.photobucket.com/albums/x133 ReWire.jpg, http://i187.photobucket.com/albums/x133 agram3.jpg, http://i187.photobucket.com/albums/x133 agram4.jpg, Re: Factory Dual Solex PDSIT Carburetor Adjustments. also reduced the maximum advance at higher revs. 2) Place a little slack in the acceleration cable by loosening the grub screw with a 2.5mm allen key, pulling out the cable slightly and tightening it again. This position is fixed by two stop screws on the carb body. Counter-Clockwise increases the idle, Clockwise decreases the idle. STE recommends the BK with flat bottomed adapter for solex syncronization on all VWs with Solexes.
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