Your donations help keep this valuable resource free and growing. Thank you.
|
4300 motorcraft carbs |
Post Reply | Page <1 4567> |
Author | ||
Peter Marano
Supporter of TheAMCForum Joined: Jul/01/2007 Location: Kenosha WI Status: Offline Points: 1650 |
Post Options
Thanks(0)
|
|
Jeeps had altitude compensation, but I don't know when it started.
|
||
FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742 |
Post Options
Thanks(0)
|
|
|
||
1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
||
Ram Air Rick
Supporter of TheAMCForum Joined: Jul/04/2007 Location: United States Status: Offline Points: 2668 |
Post Options
Thanks(0)
|
|
Just what I believe to be a correction here. The device I believe you are referring to as an "altitude compensator " is actually a "hot idle compensator " Altitude Compensators work off barometric pressure. The "Hot Idle Compensator " shown here is a thermostatic switch that works off of heat. It opens to introduce more air into the intake charge at idle, when the carb temperature gets hot enough to start vaporizing the fuel in the bowl. That vapor then becomes part of the idle intake charge causing a rich condition.The additional air introduced through the HIC opening, helps to correct the rich condition. As Paul states that style top was not used on AMC versions of the Autolite/Motorcraft 4300 carb.. Rich C. |
||
billd
Moderator Group Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
Post Options
Thanks(1)
|
|
The problem is that when someone today sees one of these carburetors, it's unlikely to be virgin unless an original owner can swear and remember 100% that no dealer nor other mechanic has done carburetor work on it, and that's not likely seeing as how humans simply don't normally have that ability (referring to legit psych classes I've taken over the years)
When you buy a remanufactured carb, especially these 4300s, here's what happens - the remanufacturer or rebuilder gets in large wire bins of the 4300s, Ford, Lincoln, Mercury, AMC, etc. - they are all stripped down and put into other baskets and sent through the cleaning process. On the other end, people pull parts out and make carburetors. IF they are making one for, just for sake of example, a 1970 AMC application, they may end up putting a Ford body on the carburetor - and they fill the PCV port with a filler, epoxy and leave the nipple off. It will have the drilled hole, but will be plugged. Genuine AMC carburetors don't have that hole through at all, reman parts may have that hole filled since AMC used their spacer for the PCV port. Same for the "air horn" - you will have a carburetor like Chuck has - the hot idle compensator. Yeah, that was covered in college, and then likely was covered again in later classes I took as part of the company-covered continuing education the boss sent us to for GM, Ford, etc. - where they covered changes or bulletins and so on. Rich has it nailed 100%. It's also in the Ford books and other info I have from the Sun fuel systems certification schooling I went through. Rich, I have a shelf full, well, DID have a shelf full, now it's more like a bench top, boxes, buckets, etc. of carburetors and parts, and have several 4300s, some are AMC, some are a mix, some are carburetors that were sold for use on AMC but are reman and I discovered were thus a mix of parts, right and wrong, correct and not so correct (such as plugged PCV ports................ BTW - Chuck's carburetor tag should be correct. ;-) I happen to know the source. |
||
Purpleheart
AMC Apprentice Joined: Jul/01/2007 Location: Canada Status: Offline Points: 147 |
Post Options
Thanks(0)
|
|
Does anyone know where to get the spacer under the 4300 carb that has the nipple for the pcv ? Paul
|
||
Best time 10.38, Best mph 128.73, Best 60ft 1.38
|
||
71SC360
AMC Addicted Charter Member Joined: Jun/29/2007 Location: East Tennessee Status: Offline Points: 5480 |
Post Options
Thanks(0)
|
|
|
||
6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5457 |
Post Options
Thanks(0)
|
|
Amark had them, both styles with and w/o the vacuum port , but they are out of stock apparently...again. http://www.amarkamc.com/product.sc?productId=543&categoryId=30 |
||
Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
||
Purpleheart
AMC Apprentice Joined: Jul/01/2007 Location: Canada Status: Offline Points: 147 |
Post Options
Thanks(0)
|
|
Thanks guys , I appreciate your help . I'm gonna try Amark Paul
|
||
Best time 10.38, Best mph 128.73, Best 60ft 1.38
|
||
1982AMCConcord
AMC Addicted Joined: Jul/13/2012 Location: Kenosha, WI Status: Offline Points: 1287 |
Post Options
Thanks(0)
|
|
2 &1/2 years later I found this thread interesting so here I am with pictures of the 4300 I have. Can someone decode this tag for me? It does has the port on the bottom. It's currently mounted on a 1973 Javelin 304 with Eddy Performer intake.
|
||
401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
Post Options
Thanks(0)
|
|
I can't tell if the first number is a 8 or 3, but 3 is 1973, A is automatic, 4 is 4 barrels,all this is explained an a 73 TSM also
|
||
Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
||
Post Reply | Page <1 4567> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |