Autolite 1100 carburetor identification is done by examining the base plate and searching for numbers. Look for the Ford part number for initial identification. Prior to '67, 1100 carburetors had one accelerator pump diaphragm. From '67-'69, there were two, with the second diaphragm acting as an anti-stall dashpot instead of an accelerator pump on automatic transmission models. If you see a spark control valve (looks like a power valve), you've found a pre-'68 1100 carburetor. The best way to identify size is venturi inside diameter - 1.00-, 1.10-, or 1.20-inches. The Mustang's 200ci six runs best with 1.10- or 1.20-inches. Ideally, you will go with the 1.20-inch for optimum performance.
The all-new 1100 Vaporizer carburetor from Pony Carburetors is not a rebuild. Instead, it's a totally new carburetor with all of the woes engineered out for optimum performance. Pony Carburetors has taken the annular discharge design found in 2100/4100 carburetors and incorporated it into the 1100 for better performance. It improves fuel atomization for a smooth transition from idle to power circuit, inducing better throttle response. It took a lot of research and development to get the Vaporizer to market, which means you're getting a well-engineered carburetor that employs the best technology available from a vintage design carburetor. Each Vaporizer is run-tested in the Pony Carburetors' engineering lab before packaging.
Like all Pony Carburetors' products, each new 1100 Vaporizer is shipped with detailed instructions plus a filter and gasket for installation. When you consider how challenging it is to find a serviceable 1100 carburetor core, plus the cost of rebuilding, the Vaporizer is an excellent value at $429.50 plus shipping.
The Autolite 4100 (left) and 2100 (right) side by side. Note how many items interchange. A
Ford introduced the Autolite 2100 and 4100 carburetors on the '57 Ford Y-Block V-8. Ironically, that same year Holley came out with its own line of performance carburetors with removable fuel bowls, metering blocks, and similar design nuances to the Ford/Autolite 2V and 4V carburetors. We've never been able to determine which came first - the Autolite or the Holley. However, both have proven legendary in terms of performance and reliability over more than 50 years of use.
Here's the Autolite 4100 four-barrel with automatic choke and anti-stall dashpot for autom
The 2100 and 4100 were direct replacements for Holley 4000 "Teapot" carburetors used on the Y-Block Fords prior to 1957. Holley 4000s were also known as "Haystacks," "Coffee Grinders," and "Fireboxes" due to their design and nasty habit of catching fire. Suffice it to say the 4000 needed to go when a new generation of carburetors from Ford and Holley came along.
This is the Autolite 4100 for 289 High Performance engines. Note the absence of automatic
What makes the 2100 and 4100 significant to Ford history is engineering advances at the time. These are the first Ford carburetors to have annular discharge booster venturis, which smoothed out the transition from idle to power as the throttle was opened to eliminate hesitation. Although we will get arguments from Holley fans, the 2100 and 4100 can easily be called the most reliable factory carburetors ever made. They tended to be limited by venturi and throttle bore size (CFM), which made Holley the performance champ. The main difference in these carburetors is size. The 2100 came in sizes ranging from 190 to over 400cfm, with the 4100 ranging from 480 to 605cfm. The 2100 two-barrel is nothing more than a 4100 without secondaries. This means there's a lot of interchangeability between the two types.