Ask the Carb Guy
Sign up Calendar
 
 
 


Reply
  Author   Comment  
Chapman
Reply with quote  #1 
Hello. I need info on this carb so I can set up the fuel system. Not much info was given or came with the jeep when I bought it. I'm not even sure if it's set up for the engine or if it was just bolted on like so much other things I've found on it. The numbers on the main body are 44153.
Thanks!
PRO-SYSTEMS

Moderator
Registered:
Posts: 3,660
Reply with quote  #2 
44153 is a 1000 cfm 4150 series alcohol carb.   I'm not sure what engine is in the Jeep though.
__________________
Patrick James-President
Chapman

Registered:
Posts: 6
Reply with quote  #3 
It's on a 421 sbc. ARF 220 CNC ported 660/661 lift Cam 114 duration, 14.5/1 compression, Magna fuel 500, Msd 8 plus. It makes about 650 on race gas. I'm having a issue with rich at a idle and really rich at the big end. The 186 jet's are in it. The bowls are set for 1/3 way up in the window. We are starting at 5lbs of fuel pressure and it goes up to 9.5-10 @ WOT.
PRO-SYSTEMS

Moderator
Registered:
Posts: 3,660
Reply with quote  #4 
Thats a good carb for that combination.  Fire it up and E us with any tuning questions. 
__________________
Patrick James-President
Chapman

Registered:
Posts: 6
Reply with quote  #5 
We have the 12-704 regulator with it but want to go to the bypass regulator. We had a problem last week on the big end where the back bowl would over fuel and flood the engine. We made only a couple passes and it did it everytime. What needle and seats and what bleeds should I be using also?
PRO-SYSTEMS

Moderator
Registered:
Posts: 3,660
Reply with quote  #6 
I would start off with the stock bleeds and Needle and seats.  What was your fuel pressure at the finish line?  When was the last time you replaced the rear float?   Its due to be replaced.
__________________
Patrick James-President
Chapman

Registered:
Posts: 6
Reply with quote  #7 
I just replaced the float. It is a Quick Fuel Notched for alcohol. The fuel pressure at the finish line 9.5-10lbs. What bleeds and needle and seats were in this stock?
PRO-SYSTEMS

Moderator
Registered:
Posts: 3,660
Reply with quote  #8 
HI Air .026
Idle air .046
.150 Needle and seats


__________________
Patrick James-President
Chapman

Registered:
Posts: 6
Reply with quote  #9 
Would you recommend your bypass regulator or keep using the 12-704?
PRO-SYSTEMS

Moderator
Registered:
Posts: 3,660
Reply with quote  #10 
With the vacuum hose hooked up, your fuel pressure should be going from 7 psi at idle to 10-11 down track.. then when you lift at the other end it should drop to 2-3 psi.  That keeps it from flooding...see if its doing that on pressure.
__________________
Patrick James-President
Chapman

Registered:
Posts: 6
Reply with quote  #11 
OK. We did that and it's looking better but the AFR is at 4.9/5.0 at a idle.
PRO-SYSTEMS

Moderator
Registered:
Posts: 3,660
Reply with quote  #12 
Let the engine tell you what it wants to idle at not a meter.

A meter only knows what happens after combustion is over.  

It has no idea what the engine wanted.

Lean out the idle until it stalls when you pull it into gear or stumbles when you jab the throttle.

Then richen it back up until its happy.

Thats where it wants to be.  Now read your meter.

__________________
Patrick James-President
Chapman

Registered:
Posts: 6
Reply with quote  #13 
Hello. We have the flood problem under control now. We had to put in a new regulator because the pump was pushing right though it.
We have came across a different issue tho. There is a hesitation that I can't get rid of. It idles at 12-1300 and when I grab the throttle it wants to stall til I hit 22-2300rpm. The ARF is showing 4.8 at a idle. Does this have to do with the air bleeds? It has the stock air bleeds in it 26 and 46.
Yesterday we ran 192 jet's and it probably could have used 200s. We run the motor about 180. Everything in the carb is clean and new. Over 2500 rpm the carb is perfect. It's getting it up on the trans brake when I'm staging in is what's the challenge.
Thanks so much!
PRO-SYSTEMS

Moderator
Registered:
Posts: 3,660
Reply with quote  #14 
Its a great carb for the combination, see if it would like a larger squirter.  Go up about .005-.008 and check the effect.


__________________
Patrick James-President
Previous Topic | Next Topic
Print
Reply

Easily create a Forum Website with Website Toolbox.