what 2bbl carb would fit my 1971 ford maverick 6 cyl 200-ci? would a AUTOLITE D1TFAMA A 2bbl carb fit? i'm going to buy the adapter if it fits..
I see listings for at least 3 different common sized 2100/2150-2V Ford Carburetors. Various venturi sizes. 1.08, 1.21, & 1.23. The venturi size is embossed or cast into the carburetor body. I am not really versed in 6 cylinder engines, but I would probably lean more towards the smaller sized carburetor. The larger ones saw duty on 302, 351, and 390 cubic inch engines. 1.08 is about 287cfm. 1.21 is about 351cfm. 1.23 is about 356cfm. The spacer plate or adapter plate might also need to be matched to a specific carburetor venturi size. D1TF, originally designed for a 1971 pickup truck.
i had a stock carter yf on my comet when it was a 200. i then switched to a carter rbs, which were common on 250's. it made a big difference (more fuel and air). just make sure to get it set right. this way it bolts right on with little to no mods, is easy to tune, and the stamped steel fuel bowl keeps the fuel cooler. while you're at it, duraspark ignition really helped my motor burn the extra fuel.
Found some interesting data http://www.classicinlines.com/PCdyno.asp Dyno shows that of the two barrel carburetors the Autolite 240cfm 1.02" venturi produced the most Hp and Torque. 196 Hp and 208Tq. Test was done on a early Mustang with 200 inline 6 cylinder with an aluminum cylinder head form Classic Inlines. Engine Build: stock 200ci short block with ARP rod bolts, Classic Inlines new aluminum head with 184/150 valves, 264-110 cam, 1.6 ratio rockers, dual-out headers, and our DUI ignition system. The DUI dizzy is set up with 24 degrees of mechanical advance @ 3000rpm, and timing was set using a vacuum gage, at 16 psi. While were not sure what the initial timing was set at (no one had a timing light), Mike is trying to borrow one so we can find out, thus allowing us to calculate the total timing. In summary the Autolite carbs worked quite well, in fact better than we expected. We were extremely please to achieve 200 plus horsepower from this engine combo, which none of us thought was possible. We believe there were two reason for this. First and foremost, Autolite carbs are an annular discharge design, which is patented by Ford. This technique of metering/distributing/mixing fuel into the air stream atomizes, or vaporizes the fuel more completely, which improves combustion and performance. It was also evident that the new aluminum head and intake manifold, prefer a specific size of venturi, at least for this set-up. The two carbs that made the most power, a 2V and a 4V, had venturi's which were 1.00 and 1.02 inches respectfully. When we tried a smaller venturi (0.98) we lost power, which we assumed was due to lack of cfm. When we tried a larger venturi (1.08), expecting a gain from the increase in cfm, we were surprised when we again lost power. Therefore we came to the conclusion that the size of venturi is extremely important for achieving the proper intake velocity and the most power. And that the venturi size will vary, depending on the cfm requirements of a specific build. While the 240cfm-2V carb made the most power of the two barrel carbs, the 480cfm-4V produced a bit more. Therefore it is also safe to assume, while the 240cfm worked well, this particular build required more cfm than was available from the 240cfm-2V. This was provided with the vacuum secondaries on the 480cfm-4V, which resulted in the largest gains and the best power. We are not implying that this is the best carb available, only that it made the most power of the carbs we tested that day. A 390, 480, or 600 Holley 4V may work just as well, we just won't know until they are tested on a dyno. However that being said, two similar builds which are both using Holley carbs, are also making around 160-170hp. Which is right where Mike was prior to his visit to Pony Carbs. You can draw your own conclusion?
