Go Back  Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1967 - 1972 F-100 & Larger F-Series Trucks
Reload this Page >

71 F250 w/ 360ci motor, w/ rebuilt Motorcraft 2100 2bbl off idle bog;

Notices
1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

71 F250 w/ 360ci motor, w/ rebuilt Motorcraft 2100 2bbl off idle bog;

 
  #16  
Old 05-16-2019, 11:57 AM
KTM520EXC
KTM520EXC is offline
Freshman User
Thread Starter
Join Date: Feb 2018
Location: Roseville, CA
Posts: 49
KTM520EXC is starting off with a positive reputation.
Tedster, what is typically on a 1971 360 vs. a 1.21 carb ???

Michael
 
  #17  
Old 05-16-2019, 05:10 PM
Tedster9's Avatar
Tedster9
Tedster9 is offline
Post Fiend
Join Date: Apr 2002
Location: Waterloo, Iowa
Posts: 15,272
Tedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputation
Originally Posted by KTM520EXC View Post
what is typically on a 1971 360 vs. a 1.21 carb ???
I don't have that info, maybe somebody here with the shop manual can look that up. At a guess, maybe 1.08" or 1.12"
 
  #18  
Old 05-16-2019, 09:45 PM
mrpotatohead
mrpotatohead is offline
Posting Guru
Join Date: Apr 2006
Location: NAMPA, ID.
Posts: 1,360
mrpotatohead is gaining momentum as a positive member of FTE.mrpotatohead is gaining momentum as a positive member of FTE.
Do you happen to have the carb tag numbers?
 
  #19  
Old 05-17-2019, 09:58 AM
KTM520EXC
KTM520EXC is offline
Freshman User
Thread Starter
Join Date: Feb 2018
Location: Roseville, CA
Posts: 49
KTM520EXC is starting off with a positive reputation.
Mr. Potato Head,

Not the original tag, just the tag that comes with rebuilt carb from rebuild Co.

From what I can gather, the stock carb for the 360/390 was the 1.23 venturi.

The one I have (1.21), was designed for the 351 Windsor carbureted engine.

Ever so slight drop in CFM ~ 6 to 7 less than the 1.23 venturi.

I guess what I need now is what is everyone else running for mains ???

The ones I had in there definitely had been used, as you could see that

they had been removed several times with flat head screw driver marks.

Possible some knucklehead decided to drill through them, dunno.

Thx !!! Michael

Michael
 
  #20  
Old 05-17-2019, 11:52 AM
Tedster9's Avatar
Tedster9
Tedster9 is offline
Post Fiend
Join Date: Apr 2002
Location: Waterloo, Iowa
Posts: 15,272
Tedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputation
Was it 1.23" ? Maybe ... like I said I dunno. Not that I'm doubting you, where did you come by that information? Yes, jets can be a real problem on old or rebuilt carbs because there's no telling what somebody has done to them. If they are buggered up I'd replace them. Thing is, and I don't claim to understand it, supposedly once a particular carb has been been benched & flowed the jet size shouldn't really need changing even from one engine to another. The jets that are in there now are a good place to start. Check plugs carefully. Modern gasoline leaves hardly any color or deposit when tuned correctly.
 
  #21  
Old 05-17-2019, 01:13 PM
KTM520EXC
KTM520EXC is offline
Freshman User
Thread Starter
Join Date: Feb 2018
Location: Roseville, CA
Posts: 49
KTM520EXC is starting off with a positive reputation.
  #22  
Old 05-17-2019, 02:27 PM
Tedster9's Avatar
Tedster9
Tedster9 is offline
Post Fiend
Join Date: Apr 2002
Location: Waterloo, Iowa
Posts: 15,272
Tedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputationTedster9 has a superb reputation
OK, sounds good... I'd strongly recommend in a general sense for anybody working with carbs to download the Ford carburetor manuals, and Autolite 2100 information, Shop manual info, and general carb documents from the 50s and 60s. They are pretty much free these days for the download.

There's some theory in them and lots of great initial setup info and bench adjustments and then fine tuning. Just take everything one step at a time and build from there. Make sure (measure, don't guess, or assume brand new means good) everything is within spec along the way, for example, if the fuel pump output is defective it will never run right, if the lines are clogged, tank full of debris and sediment, if the float is misadjusted, wrong jets installed, wrong powervalve, hidden vacuum leaks, etc.
 

Thread Tools
Search this Thread

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.