You must log in or register to reply here. To confirm settings with the engine running. This is especially true of old British cars and cars that have point type igntion systems. When the Ive checked my timing, after I did the team rush and nutter bypass, checked and replaced vacuum lines for leaks ect. i was talking to a guy that works in China sourcing silicone for chips and solar panels and other things, he even learned to speak Mandarin as he lived there for a few years. These 2 volumes are the backyard mechanics guide to the basics you need to know to make your carbs run right. Step-1: If you are having a problem with how the engine runsPoor idle quality, stalling, etc then this is the first thing to do. be tailored to suit many engine applications. So not clean themStart fresh. If you do not have enough advance you will have this problem and it will have nothing to do with the carb tuning. Both throttle plates operate synchronously like a Weber IDF or DCNF or Dellorto DRLA, except the 38 DGAS has an electric choke. You're right about the 45's. They're a little too small and you end up pulling fuel from the progression holes rather than the idle circuit. Supertech Valve Train. Start the engine, the engine will run very slowly titled it to help others in the future searching for this material.. i dont know what to do with the weber. 1/2 a turn was the ideal recommended by Redline. You can check the choke fast Idle screw under the choke The engine should pick up You must log in or register to reply here. (Voema) +15, Indroduce yourself/Welcome to new members, Chevrolet/Holden/Opel/Pontiac/Vauxhall/Ranger. Also I've seen jet kits online on ebay for these for around 55.00. Heads, Normally Aspirated Std BBC Open Chamber Dome, SBC 350 - Flat Top, 2.020/1.600 valve milled head, SBC 350 Flat top X Style Forgings - 2.020/ 1.600 valve Milled Head, SBC 350 Flat top X Style Forgings - Heavy Duty, SBC 360 Sprint X Style Forgings - Dome, Brodix ASCS Head, Super Series Piston - BBC Dome 540, 555 & 565 Open Chamber, Blown Alcohol Chrysler 4.375 Hemi (Drag Race), Blown Alcohol Chrysler 4.467 Hemi (Drag Race), Duratec 2.0L Non variable valve timing (no valve reliefs), SBF Windsler N head LIGHT WT. I'm running 170 mains on my 38 with timing 8base, 30mech, 46total. Choke Tube or Main Venturi size is the basis for everything in tuning DCOE, IDA and IDF carbs. Changed plugs at proper gaps. Thanks for the info. RememberA Weber carb is always a performance upgrade and is designed to deliver more fuel and air and make more HP then the stock carb did. Simple I've had the privilege of testing idle jets ranging from 45 to 65 with an on-board wide-band air/fuel monitor just for my own knowledge. The plugs are fouling after -+ 50km of normal driving, tips burnt pitch black. the idle speed screw set at no more than 1/2 turn in after contact with This Site Designed By Discussion in ' The Hokey Ass Message Board ' started by Brady, May 11, 2012 . BACK IN STOCK AGAIN ! EXPLODED PARTS DIAGRAMS. which are particularly useful in applications where engine compartment I contacted Reline Weber and they helped with jet size and I purchased a rejet kit from them (about 60 bucks). To me that means you're probably going to have to tweak jets and probably idle air corrector jets to get your stumble smoothed out. But thank you for the confirmation on here as well! The idle speed screw Basically do I change the ones in the float bowl to 55's or is there another set of jets I need to look for? bottom out and note if the engine dies. My air corrector jets are 170' I pulled my main jets out were 45's. conduct a series of tests and adjustments on every Weber we sell. Hey Bro, I'm running a 38/38 on my 250 with stock cam, big K&N cold air intake filter, and Aussie 2V with oversized valves. Verified Purchase. performance . Currently running an up-jetted 34Pict3 that is . JET KITS are available if needed. If all is still best and smoothest idle then confirm and note the final settings. . then it is time to jet and tune the carb(s) You need to establish if you are running lean or rich. kits and parts, It is unsurpassed for full-race use, yet its look no further for versatility, wide 289/302, 351, 429/460, Etc. Actually remove the jets and chokes and check the sizes and WRITE THEM DOWN. warmed up so that the. Quote Reply Topic: New Weber 38 38 stumbling Posted: Jan/28/2016 at 4:22pm . installed without binding and the linkage opens to full throttle and This will give you a good reading of fuel mixture and enable you to make a good judgement of what you need to do. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. They work. BMW 2002-320i M10 engine single sidedraft dcoe conversion kits. Its ran rich since I got the jeep so after everything else I'm assuming its jetting now. Now that the mixture screw is at its best running location, you can adjust the Idle speed the screw. You likely have the wrong emulsion tubes. the valve timing was all set as well. in. This is done by following the rule of thumb BELOW. about the DCOE. ITS IDEAL SPECIFICATIONS AND MAY NOT PROVIDE THE PERFORMANCE AND FUEL Recheck timing and vacuum hook ups. to clear the choke cam. Recheck mixture screw to lean best idle again. If the speed screw has to This is CRITICAL to multiple carb performanceI don't care how good you think you are at synching a set of multiple carbs by ear (I'm very good and I'm not half as good as the tool is.) You can tailor the carbs to suit your needs, driving style, engine, location, weather and altitude conditions, etc. Do not try to choke down a DCOE carb that is too large to try and cure a problemyou will just create more problems.A 45 DCOE should NEVER need less than a 34mm choke to run properly. 428 New Universal Carburetor Type Weber 38x38 2 Barrel Fiat Renault Ford VW 4CYL | eBay, https://www.youtube.com/watch?v=tPzRPga6uDg. You You cannot hang multiple carbs on any engine without an increase in spark output and even hope to burn the extra fuel being delivered. This is done on automatic choke carburetors by first opening the choke butterfly by hand and inserting a wood block or wedge of some kind to hold open Im assuming the main jets are the ones in the float bowl? i concur -- for a new carb installation the jet selection process is very specific, peculiar to the Weber design. this point. This can be the cause of richness. in. PROPER SEQUENCE, DEVIATION WILL CAUSE THE CARBURETOR TO NOT FUNCTION TO Take a look at what the output from you coil is. We only As a result, we cannot show you the price in the catalog or the product page. I did change the oil with hopes of less knock to no avail A forum community dedicated to all jeep owners and enthusiasts. out the screw (recommend turning at a time). Also check the speed screw Carbs, Conversions, Jets, Parts, Tools and Rebuilding Services. turn of base line setting then all is well. Speed Screw until it is not in contact with the throttle stop lever. You want to tune the engine by sound. It If the carbs are not hooked together in a fashion that has no slop and allows minute adjustment between the carbs you are always going to have problems. IDF Series has been and continues to be the winning choice for a by KSF Wed 02 Nov 2016, 15:34, Post The Mixture screw and idle circuit is CRITICAL to the overall driveability of the car. Do not depend on the existing settings. Please join our Sales Specials and New Product mailing list, 3/8" Mag 1/2" Hall Effect in 3-4 weeks, International Sales and Export Specialists, The Weber Factory Tuning manual and Haynes Weber Book, Make sure that your Fuel Delivery is right. A good electronic Ignition system to replace points and the addition of an MSD unit and good coil and wires are the best way to go. Check and set idle to your driving preference. Recheck timing and vacuum hook ups. You must have JavaScript enabled in your browser to utilize the functionality of this website. 3. They have excellent return customer service. For a better experience, please enable JavaScript in your browser before proceeding. Also check the speed screw and note how many total turns from initial contact. Drop the main jet size and the main air corrector size a little bit less. i thought if you were running rich you wanted to get larger idle jets? As long as the engine stays running idle speed is not important at this point. Thanks, I really appreciate you input! Its ran rich since I got the jeep so after everything else I'm assuming its jetting now. Price: $576.07 $399.95. A: the idle screw is on the throttle linkage sidethe linkage rests on it, A: it looks like that when its warm and at idle, A: the mixture is adjusted on the valve cover side as well as the fender side of the carb, A: looks like its all warmed up and ready to go. cam.). Buyer pays return shipping. Back out 1/4 turn more, or until the screw does nothing or runs worse then turn back to the point where it ran its best. It covers the Weber DGAS 38 . My new jets just came in, but I don't have time to mess with 'em. So in shortGet the carbs synched right FIRST. Ideally you want the ceramic part of the plug a nice Dark Tan to medium Brown color with a slightly darker ring right at the base of the threads of the plug. SET UP AND LEAN BEST IDLE ADJUSTMENT. can be used as a high performance alternative to most any DGV applications, YouTube Video Weber done on automatic choke carburetors by first opening the choke butterfly Thanks, I really appreciate you input! IMPORTANT TECHNICAL ARTICLE.Jetting and Tuning Weber Carbs. Shopping Cart . It is always difficult to advise this sort of thing from an armchair.. but usually the Weber38 dont have too many problems (did I just hear a chorus of "WHAT??" You are using an out of date browser. (Don't be fooled by Cheap Copy's Call until it lightly seats. is released. understand the need to keep throttle plate as near to closed as possible Use your ear, not a scope or tuning instruments at 38 DGAS? The pump jets are also not a problem. Here is a very basic chart of what venturi sizes you need to popular vehicles and engine sizes for STREET USEAll out race engines are a totally different story. assembly to confirm that it is not in contact with the choke fast idle 32/36: The primary venturi is only 26mm, whereas the minimum recommended by Weber would be 28mm. Throttle response is great, and responds well whenever I want to open it up. I have a weber 38 on my 90 258. By having 2 mixture screws you are delivering fuel from 2 places in the intake manifold. This is what The Fora platform includes forum software by XenForo. Pulled out the idle jets today and they are 45's. Here's what I'm running right now: Idle Jets: 45s (1.75 turns out on both needles) Main Jets: 145s (started with 147s, still slightly rich, I'll likely drop to 143s. out the screw 1 full turn. First, turn in the mixture screw until the engine dies or runs worse, then back out the screw (recommend turning 14 at a time). ring set, BBC 11D , 12D, 14D Flat Top - Normally Aspirated, BBC Dome 18D Big Chief and Big Duke 540, 555 & 565, Late Model SBC 350 Flat Top X Style Forgings, LOODRS PRO LITE LS Series Fits TFS 13.5 deg. Could be wrong.. but figured id try. This is especially true of all multiple carb installations. This is done by following the rule of thumb BELOW. When I accelerate the vacuum drops below 6.5 and the power valve opens, messing up the mixture. have you adjusted the idle mixture screws? There are alot of theories about setting idle mixture adjustment on a Weber carb to determine Rich or Lean jetting.A Weber will run correctly with the mixture screws from 1/2 turn to 3 turns outThe late style DCOE carbs with the extra Air Bleed Screws on the top take 2.5 to 3 turns to operate correctlySo you cannot say that because it is 1/2 turn out that you need smaller jets.You need to find what is right for that particular engineAn engine with a strong vacuum signal will draw more fuel in with less turns of the screw than an engine with a weak vacuum signal willThis is the kind of thing that throws the "certain number of turns" theory out the window.. The DGV also has a power valve circuit to facilitate low vacuum ), 1988-95 CIVIC DX / LX, HB DX / CRX-DX D15B2 / B7, 1992-95 CIVIC EX/Si, 1993-95 DEL SOL D16Z6, 1993-97 DEL SOL, 1999-00 CIVIC Si B16A1 / A2 / A3, 2009+ Laborghini Gallardo V10 / Audi R8 V10, 1988-92 ECLIPSE / TALON / EVO 4G63 21MM PIN (6 bolt), 2001-2007 EVOLUTION VII-IX / 4G63 22MM PIN, SENTRA/200SX SE-R, SILVIA, 180SX & BLUEBIRD SR20DET, OPEL ASTRA, CORSA, TIGRA, VECTRA 1.6L GSI 16V X16EX/X16EXL, OPEL ASTRA, CALIBRA, KADETT, VECTRA GSI 2.0L 16V C20XE / C20LE / C20LET, BRZ FA20 / TOYOTA FRS 4U-GSE / TOYOTA GT-86 4U-GSE 2012+, 2004+ IMPREZA STI , 2005+ FORESTER XT, LEGACY GT, 2006+ WRX EJ255 / EJ257, FRS 4U-GSE / TOYOTA GT-86 4U-GSE / SUBARU BRZ FA20 2012+, 1992-99 VR6 12V GTI / JETTA GLX / PASSAT AAA, B20 or Sleeved B18 Block w/B16A or B18C Head, 18D Dome 400 Chevy - 1.5 x 1.5 x 3.0mm ring set, 18D Dome 400 Chevy - 1/16 x 1/16 x 3/16 in. A lack of spark or weak spark will make it impossible to tune the carbs properly or to their maximum potential. I'll most likely get the jets from OGTS when the time comes. Increase the main jet size 2 steps at a time. These assumptions are based on the fact that the speed screw setting is not opened more than 1/2 turn in. Mixture screws should be as close to one turn out as you can get. Some symptoms of a lean fuel condition are: needing to adjust the idle too high, rough idle, hesitation or stumble on acceleration, a . V8 Chevy IDF and IDA Kits. A forum community dedicated to all jeep owners and enthusiasts. you like. correctly, matched for multi-carb applications, as well as to ease Drive the car above 2000-3000 RPM for a few minutes then shut the engine off before letting it idle then check the plugs. titled it to help others in the future searching for this material.. Q: does it have an idle adjustment screw? Put the car in gear and apply slight load, (AC on) and set the Idle as you like it. The likelyhood of having a defective carb out of the box is about like being hit by lightning. The number one and two reasons for The 32/36 progressive is a much better carb, at least for street applications. The idle speed screw will be sensitive and should only take 14 turn to achieve the idle speed you like. jet, 4.5 venturis. 7. While that seems to be a tragedy, we should look on the brightest side. My only real piece of advice is to be VERY methodical, eliminate all the basics, like float setting, vacuum leaks, vac/centrifugal timing advance curve, before throwing jets into the carb. Weber 38DGAS help! The timing is roughly 10 degrees. Set the Idle Speed Screw by backing out the Idle Speed Screw until it is not in contact with the throttle stop lever. It is unsurpassed for full-race use, yet its running conditions. not gona need it much longer going fI. Weber recommends 142s to start.) For those of you with multiple IDA or Rotary engines running a single 48 IDA you usually know what you are doing so I won't go into all the details on this.,.. Manufactured in Spain, at the Performance Jet Kit. /viewtopic.php?f=1&t=73925&p=574647#p574647, http://www.redlineweber.com/html/Tech/3 unning.htm. The mixture screew is very easy to set whether it be a downdraft, sidedraft or multiple sidedrafts. (turned in) the speed screw. Keep checking the plugs after driving it for a few minutes (Do not let it idle when checking the spark plug color for the main jets. Historically I have run as much as 18 degrees with the HEI setup and it ran fine. The Air Bleed for the IDA carb is in the Idle Jet holder and it is metered similar to the DCOE. Thanks for the advice. You cannot hang multiple carbs on any engine without an increase in spark output and even hope to burn the extra fuel being delivered. If so, that's the reason. Because that jet affects so much of the 0-3500rpm range, it's very important to get right. See our Fuel pump Tech Page for this information. In before the mixture screws? DO NOT OVERLOOK this as a problemThis is the #1 problem with any Weber carb conversion. synchronous, 2 barrel, downdraft carburetor. This is a very simple operationThe car should idle well and small adjustments leaner (Turning them in) should make the idle drop off. Be sure to follow the next instructions in the proper sequence, deviation will cause the carburetor to not function to its ideal specifications, and may not provide the performance and fuel economy as designed. Stud holes 6.5mm spacing 44mm actuation. Are you sure they're 70's? If Idle Mixture screws are with in 12 turn of base line setting then all is well. See more about the 32/36 or 38 choice. A 50 Idle jet is a .5mm fuel hole. Use your ear, not a scope or tuning instruments at The IDF features diaphragm type SKU: WEB-38DGES | . For successful troubleshooting, please do the following: 1. PROPER SEQUENCE, DEVIATION WILL CAUSE THE CARBURETOR TO NOT FUNCTION TO you are not close enough. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. As I may just get lucky. Drive the car. then it is time to jet and tune the carb(s) You need to establish if you are running lean or rich. linkage nut, causing a binding in linkage assembly. Brady Member from Nashville, TN I have a 223 I-6 with the clifford performance setup which includes a Weber 38 DGAS. The info you have is wrong. more like a tractor. Your setup might like some more timing, depending on where you have it on base timing. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. or Snap the linkage again to be sure that the linkage comes to close achieved by using the 38 DGAS 38 DGES synchronous-opening model. You did do all that other boring stuff didn't you ? ) where are the main jets on this and idle jets? then confirm and note the final settings. Older DCOE 2, 19, 18 Etc. Put I came across a similar Tread but still have some questions. important at this point. Start set up by confirming carb base line settings. It runs fine, but blows black smoke and smells rich, when it idles it misses every now and then thinking its due to the rich settings of the jets, also doesnt take long for the oil to smell like gas after the oil change. The engine is running rich (plumes of black smoke from exhaust). by Rossouw Tue 01 Nov 2016, 17:43, Post It has better lubrication properties for the 258 with flat lifters and may get rid of your poor lubrication noise. Bolt pattern It is fast and accurate and will take alot of the guesswork out of it. To confirm settings with the engine running. 5 months later they refunded my money no problem. I am in Houston so basically sea level. When used with A 4 cylinder 2.0 with a 32/36 is only going to make about 120-125 HP max so don't expect miracles.) If the speed screw has to be opened1/2 or more turns then this is also an indication of a lean condition usually requiring greater change. Platinum Sport 1000 Terminated Engine Harness ECU Kits, Elite 1500 Terminated Engine Harness ECU Kits, Elite 2500 Terminated Engine Harness ECU Kits, Platinum Sport 1000 Plug n Play Adaptor Harness Kits, Platinum Sport 2000 Plug n Play Adaptor Harness Kits, Elite 2500 Plug n Play Adaptor Harness Kits, Elite 2000 Terminated Engine Harness ECU Kits, Elite 1000 Terminated Engine Harness ECU Kits, Elite Terminated Engine Harness Options and Upgrades, RACEPAK DASHES, DATA & POWER CONTROL MODULES, POWER CONTROL MODULE CABLES AND ACCESSORIES. (They should be Stamped Made in Spain) Cycle Porsches. As part of our special relationship with Weber, we Weber Carburetors Carbs 40 DCOE 45 DCOE 48 DCOE 32/36 32/34 Jeep 48 IDA 40 44 IDF ICH ICT DCNF 38 DGAS electric choke DFAV DFT DFEV electric choke DGV manual choke DGAV water choke . . 1971 Opel GT - full rotisserie restoration - painted modern corvette yellow -, I was under the impression (after alot of research) that those were cheap replecas but sold under licensing of Weber inc. Here's what I'm running right now: x2 Rich so much easier to tune with a vacuum gauge and plug reading. I spent a long, long time tuning my Weber on the Comp X4250H, a smaller cam by a little. hey mark, i actually had a notion today and i had thought about that possibility, wonder what to do with the 38 to fix it hmmm. If all is still best and smoothest idle accelerator pump circuits and models with manual, water or electric choke If you get the Venturis wrong you will never get it running right. Well mainly because I was under the impression they were over $350 :sigh: Supplier does have a 30 day money back policy. I ran at 10-11 degrees, I think, with a HEI distributor and one light/one heavy spring. Small Block and Big Block Chevy, Genuine Made in Spain Weber Carbs by themselves NOT IN KITS, Carb Repair Kits and Weber Carb Rebuilding Services, 32/36 CUSTOM TAILORED for your Engine Re-Jetting Packages, Weber Carb Tuning and Technical Info. Jeep is being scraped, it shattered my t case, snapped the back axle, both rear leaf springs, and one front. redline@redlineweber.com might still work, too. A good place to start for most cars with Webers on pump gas is 12-14 Degrees advance at 1000 RPM idle and 36 Degrees total advance by 3000 RPMThis is not cast in stone and you need to make sure your car does not Detonate at these setting. I'd say it's pretty aggressive at 477/493, especially with their note that it's best for lower gear ratios and torque/mid-range power. This is done by following the rule of thumb below. It involves more than just Jetting the carbs and in fact that step is the easiest.Following these steps and rules will also make it much easier when you are purchasing jets for your carbThis applies to a single 2 Barrel Downdraft 32/36 Carb or a set of Triple DCOE carbs or even a set of 4 Downdrafts on a V8 engine.The 2 books listed at the bottom of this page are invaluable tools for learning all the basics of your carbs and the various metered tuning pieces that are used in them. In a DCOE you are acutally tuning the Air and Fuel for the idle circuit with the idle jets. They are supposed to be shipped with 55's and I'm running 50's in mine. BMW, Nissan/ Datsun, Fiat / ALFA, others. Log In | My Account/Reorder. The difficulty in tuning these types of cars is that there are many combinations that work well depending on the engine and the state of tune. If the mixture screw is more than 11/2 turns out turns then the Idle jet is too lean (too small). Drive the car. electric choke Jet It does not just control idle but the entire low speed running and part throttle transition. this point. The Shopping Cart is currently empty . limitations dictate a compact-size carburetor. tailored to small engine setups to (Fiat cars ,generators) Our price is lower than the manufacturer's "minimum advertised price." In before the mixture screws? Okay.This is going to be the Short Course in what you need to know to Tune and Jet your Weber Carbs successfullyThis also applies to Mikuni, Solex, Etc.This is not specific info about specific cars or giving you magic jetting numbers. The idle quality will be mostly unaffected, so that's not a good indicator.