Carburetors For The Porsche 911

When it comes to feeding your Porsche 911 engine or motor fuel and air, the three barrel Webers are the best carburetors in the world. They where made in Italy by a company started by Eldorido Weber.

The original three barrel Weber was fitted to a V-6 Lancia Italian sports car in the 1960’s. Later it was used on the first Porsche 1967 ‘S" model, also four triple barrel Webers where used on the Ferrari " Boxer’s " flat 12 cylinder of the early 1980’s.

 The reasons Porsche Webers are so superior to other carburetors are the following:

• Designed as a high performance carburetor in the beginning , then modify a completely stock carburetor.
• Built to very close tolerance and craftsmanship.
• Total adjustability of five areas of operation through changeability of parts. Example; ventuires can be changed, as for other carburetors 95% can not be changed.
• Vast amounts of individual parts are readily available (example; Zenith’s venturies are changeable, but only two sizes available Webers there are 10 or more different sizes )
• Tune ability, with one carburetor throat to each cylinder you can adjust air and fuel to each cylinder need. Example; when you see a four barrel carburetor on a V-8 the carburetor basically dumps its mixture in a box ( manifold ) and cylinders further away from the center of the carburetor, receives less then the closer ones. This is why you hear these engines idling so very roughly when they have high performance camshafts.

 The basic operation of the Porsche Weber carburetors are as follows:

• Air is controlled by the throat drawing in air from the velocity stacks which straighten the column of air. The first thing the air meets is the venturi. It "chokes" down the column of air and thusly increases its speed as it encounters the same size opening after the venturi it had as it entered. Example: lets say air entering carburetors is giving 10 mph with " venturi effect " the air is going 12 mph after the venturi.
• The fuel that is mixed with the air as it travels through the carb is first given out on the other side of the butterfly through the idle volume mixture screw hole, the more you turn the screw out the less it obstructs the hole, thus more fuel can enter the engine.
• There are three very small progression holes just above the butterfly, as the butterfly opens up these holes emitting fuel are exposed to the sucking of the engine. As the butterfly is opened even further more air is being drawn into the engine as fuel mixed with air ( the air is regulated by the air correction jets and emulsion tubes ) is being drawn through the main jets.
• The idle jet should be called the " progression jet " because it controls the amount of fuel going to the 3-progression holes in your Porsche carburetors.
• The last mechanism of the Porsche carburetor operations is the accelerator pump. Like the butterfly the accelerator pump is controlled by the gas pedal. In each throat the accelerator pump is simply a " squirt gun " squirting raw fuel into the carburetor throat.

As you can see a lot of different functions are needed to enable the Porsche engine to operate under a wide Variety of R.P.M.’s.

Zenith (Solex) Carburetors for Porsche 911

The Porsche Zenith (made by Solex) carburetors came out on the 1970-1971 Porsche 911 T motors. The Zenith is a very good carburetor but has had a bad rap for not being as cool or versatile as the Webers have been. See comparing Zeniths to Webers is like comparing Levi's to Tuff-Skins Jeans, they both will do the job correctly but one is cooler then the other, come on just the Italian name Weber, you think of Porsches, Ferraris, Abarths, Masarattis and when you say the name Zeniths you think of your TV set? Ok, now the other issues with Zeniths are this.

1. If you have a set of Zeniths and want to modify your Porsche 911 motor with Performance camshafts or High Compression or larger ANYTHING, you could not use the Zenith carburetors because Porsche or Solex (who made the Zeniths) do not make larger, Venturies, jettings ect. so you HAD to go with Webers. Well, we offer a full line of jetting, venturies or any part you may need for Zeniths, we have installed Zeniths on a 2.8 Twin plug Race motor and they flat out kick butt!, so no reason to change to Webers for this reason.

2. The main reason for changing to Webers in the old days was when your Porsche carburetors (Zeniths or Webers) where "worn out" which is not really true for any Porsche carburetor, you would toss them away yes we are talking Zenith and Webers and go with a brand new set of Webers! Well two things have happened since the "good ol'days" first they are not $700.00 a pair brand new anymore and second and most importantly Webers are no longer being made! So tossing them away to go with a new set of Webers is no longer and option.

3. Mechanics where the biggest down fall of the Zenith name, see if you are working on a Porsche and need to jet it, well Zeniths where not your friend since they did not make any options, what you got was what you HAD to use. Also mechanics where us to working with Webers for many years not Zeniths? There was also and still is no technical books on Zeniths except the diagram which comes in the rebuilding kits, which was no use. So mechanics did not care for the ol' Zeniths to much and who could blame them, but those days are over. Now the mechanics have to work with what they got.

So there are your three main negative issues with Zenith carburetors. Not really big issues at all are they?

Now is there anything better about the Zeniths compared to Webers? A few stand out:

1. The Zenith carburetors have three diaphragms compared to the one Weber diaphragm where this is more efficient then one diaphragm working all three throats, while the Zeniths have a single diaprpham for each throat.

2. The Zeniths come factory with torque boosters, while only the racing version like the Weber 46 mm carburetors which where installed on the factory racing 906 Porsches. These taller secondary venturies will improve the torque on any Porsche 911 or 914-6.

All we are saying is that both Weber and Zeniths are great carburetors, but do not think you have to start all over if you are having Zenith problems.

Motor Meister Carburetor Rebuilding For The Porsche 911

Here are 18 customers' Porsche carburetors ready to be shipped!

Motor Meister has rebuilt over 200 Porsche "Triple Barrel" carburetors over the years. Rebuilding the Porsche Triple Barrels are a must since they do not make Porsche Webers or Porsche Zeniths carburetors anymore, you must rebuild what you have.

Motor Meister is the only facility once the Porsche carburetors are rebuilt they are installed on a 911 engine and pre-run and dialed in for there will be NO problems. We have seen in or time that a lot of Porsche mechanics will do a great job and they finished product is beautiful BUT, when installed on YOUR Porsche they do not work? We do not and can not take this chances.

We have rebuilt Webers and Zeniths for the world over,we had one Porsche shop send us two sets from South Africa and we took care of his Porsche needs in needing his Porsche carburetors rebuilt correctly the first time! So no matter where you live we can handle your needs in any altitudes or weather conditions.

Rebuilding Process

Parts Included

New Needles and Seats

New Diaphragms

New Air Filter Base Gaskets

New Top Body Lid Gaskets

New Rubber O'rings Sm.

New Rubber O'rings Md.

New Rubber O'rings Lg.

Banjo Bolt Gaskets

New Aluminum Crush Gaskets for Plugs

New Aluminum Crush Gaskets 6 mm

New Main Jet Holder Gaskets

New Cap Gaskets

New Rubber O'rings 8 mm

Labor

Disassemble both complete carburetors

Clean and inspect all carburetor parts and bodies

Drill all passages

Machine base of carburetors

Clean passages and parts thoroughly and test

Install all new parts

Assemble carburetors completely

Inspect carburetor manifold upper and lower bases

Machine base of carburetor manifolds

Paint manifolds "Satin Black"

Install completed carburetors on manifolds

Clean, straighten and inspect all linkage assembly

Install carburetors, manifolds, linkage onto Porsche 911 motor

Test, dial in and synchronize carburetors on Porsche 911 motor.

Once the Porsche carburetors have been tested and are ready to go, then we move onto your ignition distributor.

Take customer's Porsche Ignition distributor and install on Distributor Dyno

Motor Meister checks for proper curve or problems with the Porsche ignition distributor.

Once tested Lee Marks marks down and tags ignition distributor what curve was at at all different rpms. Distributor is tagged and ready to go!

Once completed box up and ship to customer!

Lee Marks is a guru with Porsche Carburetors.  He is here to help our customers out with final adjustments or tuning for certain racing events.

If you have major damage like a fire has burnt parts or carburetors will not open because of water condensation, we can still work with them so NEVER toss them away!

Motor Meister carries a full line of Stock or Racing parts for the Weber and Zenith Triple Barrel Porsche carburetors.

To learn about jetting and setting up your Porsche 911 carburetors for Performance or parts needed. Click below to check out a full expanded view of all the Porsche Carburetors for the 911.

or e-mail MotorMeister@aol.com

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