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Racing Fuel Systems • View topic - Bleed/jet relationship
Page 1 of 1

Bleed/jet relationship

PostPosted: Mon Aug 30, 2021 3:30 pm
by Rat Bastid
I have a question for which I can’t find an answer. So here goes. Is there a relationship between the size of the idle feed restriction and the idle air bleed? In other words, if I reduce the IFR .008 should I reduce the IAB some to keep the relationship close? I’m having some tip in issues with tunnel ram stuff and I think that getting the IFR where I want it to get the idle clean and leaving the IAB where it was, or even a few thou bigger, again to get the idle clean is giving me that tip in issue.

Am I going the right way, or am I going off the rails?

Re: Bleed/jet relationship

PostPosted: Mon Aug 30, 2021 5:23 pm
by rgalajda
"Tip in issues"
meaning off idle stumble
or
idle circuit transition to main circuit

Re: Bleed/jet relationship

PostPosted: Mon Aug 30, 2021 6:01 pm
by Rat Bastid

Re: Bleed/jet relationship

PostPosted: Wed Sep 08, 2021 8:44 pm
by jmarkaudio
Tunnel Ram carbs typically use a smaller idle feed with a smaller idle bleed, to make the transition metering last farther in the throttle opening. .008 is a lot to change on the idle feeds, what carbs and fuel?

Re: Bleed/jet relationship

PostPosted: Fri Sep 10, 2021 6:13 am
by Rat Bastid

Re: Bleed/jet relationship

PostPosted: Sat Sep 11, 2021 2:39 pm
by jmarkaudio
I might leave the idle feed alone, just go down on the idle air bleed until the stumble clears. Might take up to .015... Is the idle feed in the stock location or moved to the bottom?

Re: Bleed/jet relationship

PostPosted: Sun Sep 12, 2021 5:48 am
by Rat Bastid

Re: Bleed/jet relationship

PostPosted: Sun Oct 10, 2021 2:53 pm
by jmarkaudio
Try some .028 feeds, start around .060 bleeds.

Re: Bleed/jet relationship

PostPosted: Tue Oct 19, 2021 10:20 pm
by Rat Bastid

Re: Bleed/jet relationship

PostPosted: Fri Dec 16, 2022 9:12 pm
by 440Duster
I realize this is an older post, curious as to how the .028 IFR/.060 IAB panned out?