I just built a 1957 312 for my 1955 Mercury that has a Mercomatic transmission with the original 3.15 ratio rear end.  I want to use a 4100 carburetor and need to know if the 1.12 verturi 600 cfm would be a good choice since the engine is bored .060 over and has a mild E 4 Isky cam or should I go with the 1.08 smaller cfm 4100?   

buddy

I am working on the same setup more or less.  A cam that is close to the Isky, maybe slightly more performance, 312 .060 OS.  Plan to try out a 1.12 4100.  The carb is a 1965 unit for 352.  I think it will work fine in the 322.

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.

Thanks for the response Mike and a 4100 carburetor from a 352 is exactly the kind of carburetor I'm searching for.  I just wasn't sure how a 600 cfm would work out with the automatic transmission with a high ratio 3.15 rear end.

buddy

I have been using one on my 301 (292 .060 over) and have never had a lick of trouble.

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

Buddy: If I recall correctly,Ted's tests of several carbs on his 0.60 over 312 test mule, some time back, indicated that the 1.08 carb worked better than the 1.12. You could do a search.

Paul

The 1.08 is better suited for it if one is available but those are scarce as hens teeth and a mustang restorer will give big bucks for one of those.

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

I finally put my 4100 1.08 Mustang carb on my 292.  It hasnt made any difference over the 1.08 2100.  Secondaries arent opening, so there is more work to be done.

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.

The 600 cfm 4100 is likely to much carb for your car unless you are using the new heads or done something to make much more HP. The 1.08 venturi 4100 would be my choice for a carb.



If looking for a 1.08 Autolite 4100 be aware that not all 1.08's were created equal as the 1.08 was also used as a smogger carb on the big 428 FE engines. Some are California emissions carbs also. Check the numbers on the foot of the carb before putting your money down as those smogger carbs did not run well on the big engines and are very hard to make run well on the small blocks. If you change the booster venturi they will work better however you need the good 1.08 booster venturi to do this fix so there is no savings.



My opinion the best 1.08's are the C6ZF which was the last year 1.08's used on the 66 Mustang with a 289 engine.

Next best is the C5Zf which is for the 65 Mustang with 289. One of the booster venturi's is different than the C6Zf and the C6ZF has a hot idle compensator.

Next in line is the C6PF which was the over the counter replacement for the above carbs and the FE engines. It is a good carb, very close the the above ones.



If you find a 1.08 with a different number be wary.



Here is link to ton of info on the 4100's. You make have to highlight and paste it.



http://www.network54.com/Forum/88781/thread/1277755260/Carb+Help



http://www.network54.com/Forum/88781/



marv

I have run 1.02, 1.08 and 1.14 venturi 2100s on my 292.  The 1.14 Mustang carb was the best for fun, but settled in on the 1.08 for combo of fun and mileage.

322 cid falls right in the middle of the 1.08/1.12  4100 series respective to engine displacement.  So either way it is a compromise.  Will the smaller carb get 10 more or less HP, dont know.   The club 54 site is a great resource, but it appears to me that it hasnt given adequate flexibility to the 2100/4100 series of carbs.  I did recently ask the current guru, Ed, about the 322 vs. 1.12 352 carb, and he thought it should work too. 

Guys are running 1.08 4100s on 272 and less displacements, and are happy.  Having said that other guys are running 1.21 2100s on Jeep 304s and are happy .

Word to the wise:  1.21 2100 dont work well on 289/292/302/304/312

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.

Hi     an interesting thread for me as i have a 1.12 4100 and am going to use on my project   so i will follow your progress with great interest. Teds carb test is in the Y-Block mag and the 1.08 did better than the 1.12.  another Y-Block enthusiast, J. Christenson rates these carbs highly pointing out their fuel consumption on dyno tests.(pity he does not use this site)      depending on finances Pony carbs offer rebuilt versions including a spread bore version , 1.08 primary 1.12 secondary  they also rate them highly. i also believe Summit offers a copy.

stuey

England