Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 05-28-2019, 03:22 PM   #1
waltere
Senior Member
 
Join Date: Jul 2010
Location: Wichita Kansas
Posts: 125
Default 8BA running rich

I would like to pick some brains. I am running an 8BA, with a 30 over bore, 4" crank, Isky 400 cam, and a pair of 97's. I have them jetted with 45's and uncertain of power valve size. The motor runs great but seams to be rich. (smells rich, plugs are black, tail pipe black), I friend is suggesting progressive linkage and plugging the idol circuits on the rear carburetor. Can you give me any advise on what to do in this situation.
Thanks in advance
Walter
waltere is offline   Reply With Quote
Old 05-28-2019, 03:49 PM   #2
flatheadmurre
Senior Member
 
flatheadmurre's Avatar
 
Join Date: Apr 2015
Location: Sweden
Posts: 2,379
Default Re: 8BA running rich

Progressive linkage with duals is not a great idee...fuel distribution will be uneven between cylinders.
Install an Air/Fuel meter and rejet the carbs...A/F meters ainīt to expensive and beats guessing...
flatheadmurre is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 05-28-2019, 03:49 PM   #3
50droptop
Senior Member
 
Join Date: Oct 2016
Posts: 141
Default Re: 8BA running rich

I have a 21 Stud with 2 97s and have had good success with 42 jets and 69 power valves. Like you, I was running very rich.
50droptop is offline   Reply With Quote
Old 05-28-2019, 04:09 PM   #4
flatjack9
Senior Member
 
flatjack9's Avatar
 
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 3,370
Default Re: 8BA running rich

Whatever you do,don't listen to your friend. As noted, drop down a couple sizes on the mains and check what you have for power valves.
flatjack9 is offline   Reply With Quote
Old 05-28-2019, 04:36 PM   #5
Ol' Ron
Senior Member
 
Ol' Ron's Avatar
 
Join Date: May 2010
Location: Chester Vt
Posts: 6,819
Default Re: 8BA running rich

This actually works. Get q block of plate and block one carb, or jus take it off and run one carb. THis works quite well and you can drive the car with little if the carb is right. The 400jr is a very hot cam and it shouldn't idle slow. 750 or better. Too much gas can wash oil from the cylinders and ruin the rings
Ol' Ron is online now   Reply With Quote
Old 05-28-2019, 05:15 PM   #6
revkev6
Senior Member
 
Join Date: Nov 2012
Location: western Mass
Posts: 365
Default Re: 8BA running rich

One other thing often overlooked is the little chrome airfulters are like running a choke. I had 43 mains (maybe even less) on my 97s for years with the little chrome filters and if I pulled them off and drove around the block the car would barely run...
revkev6 is offline   Reply With Quote
Old 05-28-2019, 06:20 PM   #7
alanwoodieman
Senior Member
 
Join Date: May 2010
Location: upstate SC
Posts: 1,920
Default Re: 8BA running rich

I have used a couple of sets of these adjustable jets on two 94' intakes and they really let you adjust. run it awhile and "read" the plugs
alanwoodieman is offline   Reply With Quote
Old 05-28-2019, 07:42 PM   #8
aussie merc
Senior Member
 
aussie merc's Avatar
 
Join Date: Sep 2016
Location: sydney australia
Posts: 142
Default Re: 8BA running rich

keep re jetting it takes time but it works. Find a good dyno in your area its worth it in the end. Ive ended up with 39 mains and 70 Pvs in mine alot leaner than i thought was needed but it worked super drivable and gets around 25mpg now not 10 maybe
aussie merc is offline   Reply With Quote
Old 05-28-2019, 07:53 PM   #9
Ol' Ron
Senior Member
 
Ol' Ron's Avatar
 
Join Date: May 2010
Location: Chester Vt
Posts: 6,819
Default Re: 8BA running rich

An AF meter would help.
Ol' Ron is online now   Reply With Quote
Old 05-28-2019, 08:45 PM   #10
waltere
Senior Member
 
Join Date: Jul 2010
Location: Wichita Kansas
Posts: 125
Default Re: 8BA running rich

Thanks for the input. 50droptop I am going to try your Idea. I have a new set of jets and power valves. I will report back!
Thanks
waltere is offline   Reply With Quote
Old 06-16-2019, 10:49 PM   #11
waltere
Senior Member
 
Join Date: Jul 2010
Location: Wichita Kansas
Posts: 125
Default Re: 8BA running rich

Ok guys a few more suggestions would be helpful. I am now at #65 PV and #43 jets. Runs much better but after about 120 miles on a new set of plugs they still look like I am to rich. Should I try another set of smaller jets? different Power valves?
Thanks in advance!
waltere is offline   Reply With Quote
Old 06-16-2019, 10:58 PM   #12
drolston
Senior Member
 
drolston's Avatar
 
Join Date: Jun 2014
Location: Williamsburg, VA
Posts: 811
Default Re: 8BA running rich

Be sure your fuel pressure is not too high and floats set right.
drolston is offline   Reply With Quote
Old 06-17-2019, 07:15 PM   #13
waltere
Senior Member
 
Join Date: Jul 2010
Location: Wichita Kansas
Posts: 125
Default Re: 8BA running rich

checked floats and fuel pressure Both look good!
waltere is offline   Reply With Quote
Old 06-19-2019, 07:10 PM   #14
aussie merc
Senior Member
 
aussie merc's Avatar
 
Join Date: Sep 2016
Location: sydney australia
Posts: 142
Default Re: 8BA running rich

you just have to keep trying to see what works personally a dyno is the way to go much quicker and you can tell whats going on other wise a vac gauge, a A/F meter a good stretch of quite road and a bucket load of patience
aussie merc is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 04:19 PM.