Multiple Carburetor Inquiries

Trying to find some information on carburetors used by VAM and AMC in six cylinder engines.

Can anyone provide me with the specifications on the Carter ABD two-barrel carburetor? Mainly CFM is what I need to know.

This one was used by VAM in the 282 six cylinder engines from 1971 through 1974, that means all second-generation Javelins (until 1973, last year in Mexico) and all 1972-1974 Classics (Matadors). For 1975, the Holley 2300 rated at 350 CFM two-barrel took its place.

Also VAM, and think it is the same for AMC, used both the Carter YF and the Carter RBS single-barrel carburetors in six cylinder engines in the 60s and 70s.

I know for certain that the YF model is rated at 200 CFM, I don't have the CFM spec on the RBS model. Does anyone the full specs on these two models? Also, does anyone know the difference in quality/reliability between them? Strong points, weak points, performance, economy, maintenance.

In Mexico, the 155-hp version of the 232 six (same as AMC) used the Carter WCD two-barrel carb. It was also used in VAM's 252 six in most cases: Javelin, Rambler Classic (all Rebels and 1971 Matador), Rambler American Rally (Hornet X and Rallye X). Does anyone have the specs on this one as well?

In Mexico, from 1975 through 1977, the Holley 2300 two-barrel was used in all 282-equipped models: Classics (Matadors), Pacers, American Rally (Hornet X), American GFS (Hornet DL two-door) and Camioneta American Automática (Hornet DL wagon). For 1978, it was replaced with the Motorcraft 2150 model rated at 325 CFM.

I discovered recently that in the US putting a Motorcraft 2100 two-barrel carb in a 258-equiped car is a common modification. What are the differences between the Motocraft 2100 and the Motorcraft 2150? What improvements take place after swapping the 2100?

What are the standard carburetor models in Concords, Spirits, and Eagles with six cylinder engines between 1978 and 1988 in the US? In the 1980s, VAM kept on using the Carter YF for the 258 and the Motorcraft 2150 for the 282, only special high performance editions used the Holley 2300 (all 282). No V8 and fours for Mexico. I know the US cars got computerized engine control since the 1982 model years, consisting partially in a computer-controlled carburetor. This system was not used in Mexico under VAM.

Thanks for reading.

Jeep sources give the rating for the Carter BBD as used on the 258 as 195 cfm.
The WCD 2V is around the same, but I haven't seen any "official" figures, just in the 195-220 cfm range. It's hard to find CFM ratings for factory carburetors.

You can get a fairly decent estimate of how much a carb is capable of flowing by measuring the size of the venturi (the smallest section in the center of the carb) and comparing with known carb sizes/flows. This isn't real accurate, but does give a reasonable idea of flow.

The Ford 2100/2150 rates are well published:

2V 2100/2150 at 3"Hg. Venturi size listed first.
0.98 = 190 CFM
1.01 = 240 CFM
1.02 = 245 CFM
1.08 = 287 CFM
1.14 = 300 CFM
1.21 = 351 CFM
1.23 = 356 CFM
1.33 = 424 CFM

Remember that this is VENTURI size, not throttle plate size (venturi will be a bit smaller), and this is for 2V carbs. Can be applied to 1V, just take half the flow listed above (a 1.01" 1V carb will flow ~120 cfm).

These sizes won't work for 4V carbs -- unless your only purpose is to directly compare with 1V and 2V carbs. 4v carbs are rated at a different pressure drop than 2V.

I ran the BBD from my '68 Plymouth on my old Eagle for awhile. Ran like a scalded cat, BUT the fuel economy suffered (and my right foot got heavier) That was with 2.37 gears and 235/75/15 tires (I could smoke them from a standstill or if I downshifted from 2nd to first under 20 mph)