carbking

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carbking last won the day on December 15 2016

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About carbking

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    Carburetor specialist
  • Birthday 04/12/1946

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    www.thecarburetorshop.com

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  1. Matt - I am not one pushing back, and in fact have electric pumps on ALL my collector vehicles (well, not the John Deeres), however; here is some information from my website: There are a number of reasons car enthusiasts look at electric fuel pumps. The most common being hard initial starting due to modern fuel evaporating from the carburetor overnight. Whatever the reason, there are a number of considerations when deciding to install an electric fuel pump: (1) Is the installation legal? Electric fuel pumps should be installed with the permanent wiring activated by something like an oil pressure switch, such that in the event of an accident and the driver becoming incapacitated, the electric fuel pump would automatically be turned off. Temporary wiring to a push button can be used to activate the pump and fill an empty carburetor. Release of the pump button will kill the pump, but there will be sufficient fuel in the carburetor bowl to start the engine and run until the oil pressure comes up to activate the permanent wiring. (2) Does the pressure produced by the pump fall within the parameters required by the carburetor? This question has more than one issue and should be considered carefully. Think of the difference in methodology of the electric pump vis-à-vis the stock mechanical fuel pump. The electric pump is more or less a constant pressure, constant volume pump (assuming the GPH of the pump is greater than the maximum demand of the engine). The stock mechanical pump is driven by the engine; therefore volume, and to a lesser extent, pressure, is a function of the RPM of the engine. Thus it is quite possible, if the wrong electric pump is chosen, to have a pump that floods the engine at idle, and has insufficient volume to maintain proper carburetor bowl lever at wide open throttle. (3) Because of (2) above, many enthusiasts opt for an adjustable inline regulator. Many of the less expensive regulators regulate pressure by regulating volume. Thus getting the pressure sufficiently low to not flood the engine at idle then limits the volume necessary to drive the vehicle at highway speeds. And just because the dial on the regulator states some number, do NOT ASSUME that the output pressure from the regulator is what the dial indicates. ALWAYS check the output pressure with a calibrated fuel pressure gauge. A return fuel line from a connection just before the carburetor back to the fuel tank is MUCH better at reducing idle flooding than a regulator. Summary – the electric pump IF properly selected and properly installed, may be of benefit to the enthusiast. Do it wrong, and one had better check with their insurance agent about fire BEFORE installing the pump! Jon.
  2. Larry - you are using the wrong tool to remove the seat Before I describe this...................................it works with brass carbs and cast iron carbs (modified procedure) NOT WITH ZINC ALLOY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Find the worst BRASS carb you have, so you can try the procedure. Get a pair of vise-grips, a five gallon bucket, a piece of foam rubber, 3 gallons of water, and an acetyline torch (NOT MAPP gas or propane). Put the foam rubber in the bottom of the bucket, and add the water. Grasp the carburetor body with the vise-grips. Turn on the torch. Heat the bottom (where the screw slot is located) of the seat with the torch. Exactly when the color of the flame changes from blue to a greenish-yellow, drop the casting into the bucket of water. Remove the casting from the water, and unscrew the seat. To make this post more generic, for cast iron carburetors: Do everything as above but DO NOT QUENCH IN THE WATER! Let the casting cool naturally. THE CAVIAT: NEVER EVEN THINK ABOUT THE POSSIBILITY OF CONSIDERING HEATING EARLY ZINC ALLOY WITH A TORCH! IT CAN EXPLODE! Jon
  3. Replacement needles AND seats come in the carburetor rebuilding kit. The trick of chucking the needle in a lathe (with a taper attachment) and then turning out the groove (if a groove is present) will work if the fuel valve seat screws in from the same direction as the needle is inserted, but will no work in this case. WHY? When one turns out the groove on the needle, one changes the overall length of the needle. To compensate, one must either bend the float arm (guaranteed to break on these early cast brass arms) OR place a thicker washer under the seat if the seat screwed in from the same direction as the needle. Since the seat in this carburetor screws in from the BOTTOM, it would be necessary to remove the seat and either find a thinner washer (good luck) OR chuck the seat in the lathe and remove the corresponding amount of metal from the seating area of the seat. Jon.
  4. The spring loaded valve in the bowl cover is Marvel's early attempt at a "choke" Often referred to as a "flooder" valve; when one needed to start a cold engine in cold weather, one depressed the plunger, which depressed the float, and gasoline went everywhere! But it would create a richer starting mixture. It could also be used to flood the fuel valve and flush any dirt or other debris. Jon.
  5. The following is copied from my website troubleshooting section, and was written for downdraft carburetors; but the cause is the same. Since the throttle shaft in an updraft is above the fuel level in the bowl, the fuel finds a different spot to leak: " FUEL LEAK BY THROTTLE SHAFT(S) A common complaint today is fuel dripping out of the throttle body by the throttle shaft AFTER the engine is switched off. While a number of issues may cause this problem, by far the most common issue is the volatility of modern fuel. Mechanical fuel pumps have a check valve which prevents fuel from moving back to the fuel tank. The problem is as follows: (1) After the engine is switched off, heat from the engine heats the fuel in the fuel line. (2) The expanding fuel (increased volatility) creates pressure in the fuel line from the pump to the carburetor. (3) The check valve prevents the fuel backing up through the fuel pump. (4) The pressure increases to a point the float/fuel valve combination in the carburetor cannot withstand the pressure. (5) An amount of fuel (usually from a teaspoon to a couple of tablespoons) flows into the fuel bowl of the carburetor. (6) This raises the fuel level in the bowl above the main discharge nozzle(s). (7) Fuel flows through the main discharge nozzle(s) and drips onto the throttle plate(s) which is/are closed, and exits out beside the throttle shaft(s) dripping onto the intake. Possible solutions: (1) IF POSSIBLE, AVOID ETHANOL LACED FUEL! Sometimes you can buy real gasoline at a marina (2) Buy the lowest octane name-brand fuel that does not ping or detonate in your engine (the higher grades often have more ethanol) (3) Install a “vapor return line” (take a look at return lines used on many factory air-conditioned cars) (4) Learn to live with the issue. HARD STARTING, COLD Difficult starting a vehicle that has been allowed to sit for a number of days (that will then start well the rest of the day) is often caused by modern fuel. Modern fuel begins to vaporize (evaporate) at a much lower temperature than fuel before the 1970’s. Once the engine is shut off, the fuel in the carburetor bowl begins to evaporate through the bowl vent. If there is no fuel in the carburetor, the engine will not start. Pumping the footfeed during this time simply prolongs the agony, as the accelerator pump will pump the fuel into the engine, but in amounts insufficient for starting. If you have this problem, try priming the carburetor by using an eyedropper and filling the carburetor bowl through the bowl vent prior to cranking the engine. If you do not wish to prime the engine, crank the engine for 15 to 20 seconds WITHOUT PUMPING. Then stop cranking, pump the footfeed 3 or 4 times, release it, and then reattempt to start the engine. Priming eliminates excessive wear on the starter. Another possible solution is the installation of an electric fuel pump. If an electric pump is installed, check local, state, and federal laws about wiring; and pick a pump with pressure not exceeding that of the original pump." Jon.
  6. With the fuel pump, you don't have the Molotov Cocktail in the engine bay, but you also don't have the slow leak INTO the carb to replace evaporation. The is very little fuel in the bowl and it evaporates quickly. The easy way out is a 1~1.5 psi electric pump. If you cannot find a pump in this pressure range, then a regulator MUST be used with higher pressure. When buying the regulator, do NOT allow the thickness of your wallet to influence your decision. You need a regulator with an internal bypass, not one of the inline dial-types that regulate pressure by regulating volume. They are too much even if free! And there best use is if you have a rabbit problem in your garden, and a strong and accurate arm! But to answer your other question: acquire a spray tube from a can like WD-40, and a plastic squeeze ketchup or mustard container. Insert one end of the tube into the end of the squeeze part of the K/M container, and you can fill the bowl through that small vent. Jon.
  7. Good luck on ever seeing one of those carburetors that is not cracked to pieces, let alone one in usable condition. Jon.
  8. Ed - that one looks like a Schebler type T. Jon.
  9. Zenith produced the passenger and truck type 63 (mentioned in my previous post with the Stromberg type SF). The marine version of the same type was the 263. Neither have been produced since the mid-1970's; however, Zenith did have some inventory of both up to about 15 or so years ago. I bought all of the existing 63/263 Zenith had in inventory when Zenith obsoleted (there was a political reason, which I will not discuss here) them. The major differences between the 63 and the 263 (not on all models) were some of the 263's were brass, some of the 263's had brass fittings, and some of the 263's had an air horn which turned slightly upward, rather than being straight. All three of these types come in 5 different S.A.E. flange sizes, plus all three have removable/replaceable venturii. Two keys to their use: (1) determine the S.A.E. flange size (adapters are for snake oil salesmen , unless it is a cross-flange required to properly orient the carburetor), and (2) determine the correct internal venturi size for the engine on which the carburetor will be placed. Once both are determined, and the correct carb is acquired (don't think one with be sufficient lucky to buy just any of the above and find the correct venturi on the shelf), the jetting becomes fairly easy. And the correct venturi can be fabricated, if one has a lathe with a taper attachment; but easier to start with the correct unit than fabricate parts. This link will enable one to determine (from the single barrel intake manifold) the S.A.E. carburetor size required. Stromberg SF/SFM series carbs and flange sizes The venturi size is a bit more complicated. Jon.
  10. John - obviously, I did not read it the same way you did. To me, that would be a 2->2 adapter with different footprints. Semantics can get us into trouble EDIT: my understanding if someone says 2->1 adapter [image] Jon.
  11. Suggestion - don't even think about the possibility of considering a 2->1 adapter! If you were, think NASCAR, and restrictor plate racing. The UUR-2 was one of the best two-barrels of its time, but inferior (opinion) to a correctly sized single barrel Zenith type 63 or Stromberg type SF. Think about it. The UUR-2 was discontinued around WWII. The Zenith type 63 and the Stromberg type SF were still being sold in the early 1970's! It would make an interesting back-to-back test of the UUR-2 versus the SF or 63 IF one had the two-barrel manifold for the UUR-2 (I think the single-barrel would prevail, but just conjecture). With a 2->1 adapter, would be absolutely NO contest. Jon
  12. Ed - generally the date is the date of the bulletin, and the effective date would have been earlier. The bulletin does mention engine number H-1193 as the changeover engine. Jon.
  13. Sorry guys - wish my memory was better 😠 Tillotson type VD carb used by Stearns-Knight If anyone has a better copy of this bulletin (that is more readable) would like to see a scan. Jon.
  14. Ed - so did Marvel-Schebler, but much later Jon.
  15. The listing I have for 1929 is a Tillotson type VD-1A, superseded by VD-1B. I have no data as to if this is a single barrel or two barrel. The Tillotson books completely ignore this model. EDIT: Ed, I was typing while you were posting. I would certainly agree with you about the quality of the Tillotson (if that was original) vis a vis a Stromberg UU-2/UUR-2. I am just trying to keep my database as correct as possible. Stromberg DID offer over-the-counter aftermarket replacement UU-2 and UUR-2 carbs with generic calibrations. Jon.