2100 motorcraft carb on a 85 bII

[roughranger]

i have a 2100 off of a 67 289, is this to much carb to replace the factory 2150? I figure the 2100 has more CFM but is it to much for te 2.8? the motor is stock but is in a mud truck so i dont care about MPG's. i read so where else i wold have to measure the ventries to get a idea of the CFM but just wanted u guys opinion. thanks rough

 

[Jorley]

The 2100 and the 2150 are basicly the same carb. the 2150 came after the 2100. I would think the 2150 would be better than the 2100.
http://wsapi.infospace.com/clickser...XxU=&40=9zBN1xeFIj+nFY6tgBf7LA==&_IceUrl=true

 

[85_Ranger4x4]

I tried it, my '71 2100 that came on my '67 289 was plain and simple too big.

Overall I just couldn't get it to run right, the little engine just couldn't move enough air at idle to keep everything moving properly. It ran ok at speed, better than it ever has, but fell flat on its face at idle.

The holes in the carb spacer are too small as well, and that bugger is made out of some interesting material. It took me 2 hours at a drill press with a rotory file to get the stupid thing to even look like it would work, and then it didn't.

So back to the crapper feedback...

The big difference is that there is at least two sizes of 2150, the one that came on a 351M or 400 is not the same as the one that came on a Pinto, it has bigger venturi's. The instructions in my rebuild kit mentioned nothing smaller than a 260 something for setup, and went up to a 390.

 

[Big Jim M]

I have done carb swaps on a few Jeeps. The smallest 2100/2150 made has a 1.08 venturi and fits the 4.2 litre Jeep engine rather well... It is easy to rebuild and pretty stout in that application. Although them carbs were installed on Ford engines all the way up to 400 cu in the six cylinder was the smallest and had the 1.08 venturi in it.
Many guys have installed 2100's with 1.20 and above venturi and had poor performance on the 4.2 engine.
Big JIm

 

[alabamaranger]

You have to have a 2100 or 2150 with the 1.08 stamp. I think the jet size is around 46 or 47.

If using a 2100, be careful of the carb gasket. If you don't have the right one, you will get a vacuum leak. I would stay with the non computer 2150 type.