What happens in the carb & when?
Hi all! After this weekends RR session (which the car survived ;), and again big thanks to everyones help that day, helping me to understand the RR read out) I found out that the car is rich low down in the rev range at 2745 with a reading of 9.something and then on WOT leans out too a steady 10.4.
What i want to find out is at what stage something happens in the carb so i can pin point what i need to change/adjust to get the carb fuelling for 16psi and not the 22 which it was set up for!
I havent a clue yet as to what spec the carb is set to, i need to strip it and do some measuring :crap: i have only ever done this once on someone elses carb as well :D
Re: What happens in the carb & when?
New poster! (less than 10 posts)
the lower the number the richer the mixture is mate, so 10.xx is actually quite rich
Re: What happens in the carb & when?
I'd check that you actually have a main jet in the carb!
Re: What happens in the carb & when?
Quote:
Originally Posted by
i l k e r
New poster! (less than 10 posts)
the lower the number the richer the mixture is mate, so 10.xx is actually quite rich
that's what he said ;)
Chris, do you have a group A carb?
Re: What happens in the carb & when?
Yea i now understand what the readings mean thanks to Adam and Bruce, but i wanted to know when each stage kicks in, in terms of RPM or another reference point!
Jantheeven i havent a clue mate, all i know is BB rebuilt the engine a couple of years ago and set the carb to run 22psi with an in car adjustable boost controller, which is set as 12psi-22psi
Re: What happens in the carb & when?
Have a read of post number 2 in this article, it should sum everything up for you nice and easy! https://www.rtoc.org/boards/showthread.php?t=460
Re: What happens in the carb & when?
I thank you very much, i couldnt find any of the threads this morning, BUT key word there "MORNING"
Re: What happens in the carb & when?
Quote:
Originally Posted by
Chris Hebden
Jantheeven i havent a clue mate, all i know is BB rebuilt the engine a couple of years ago and set the carb to run 22psi with an in car adjustable boost controller, which is set as 12psi-22psi
How can a carb be set to run at 12/ 22 psi and be expected to fuel correctley.
Re: What happens in the carb & when?
give me a shout if you get stuck, I have a few bits kicking about. Do you have a wb lamda, or were you just using he RR one?
Re: What happens in the carb & when?
Quote:
Originally Posted by
dj13
How can a carb be set to run at 12/ 22 psi and be expected to fuel correctley.
LOL thats why i was so keen to get to the RR and see how far out the car was running 16psi
Thanks Andy much appreciated, for now i am going on the graph that was produced at the RR but in the next week or so i will be (fingers crossed) owning a LM-2 that logs, so that i can reference back and cross reference to the RPM
Re: What happens in the carb & when?
Quote:
Originally Posted by
dj13
How can a carb be set to run at 12/ 22 psi and be expected to fuel correctley.
Enrichment circuit mod's.
Re: What happens in the carb & when?
Quote:
Originally Posted by
Mart
Enrichment circuit mod's.
How exactley would you do that then Mart , please do explain , i was under the illuision that you can only have carb set up correct, for one boost pressure :confused:
Re: What happens in the carb & when?
Quote:
Originally Posted by
dave j gtt
How exactley would you do that then Mart , please do explain , i was under the illuision that you can only have carb set up correct, for one boost pressure :confused:
Me too! That's why I sold my in-car boost control kit... on advice of some members here
