 Target AFR at Idle/Cruise with carbs |
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| yeahmag |
 Jun 23 2011, 09:21 PM
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Advanced Member  Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California 
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I was reading a thread on carb tuning that John Connolly of aircooled.net was on and he suggests a much leaner idle/cruise AFR than what I've been running. I've set a target of 12.5-13.5 in that range, but he suggests you can go much leaner than that.
This may also explain why Jake thought I was nuts when I went from a 60, to a 62, and then finally a 65 idle jet on my 40 Dellorto's. Does anyone have any real world insight on this? I've loaded in my 60's for a ride tomorrow... -Aaron |
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| ChrisFoley |
Jun 24 2011, 01:43 PM
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I am Tangerine Racing Group: Members Posts: 7,934 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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One should set the idle jets for a good mix when accelerating from a standstill. The main jets then need to be sized for 12.8+/- at WOT.
The usual result is that part throttle running will seem a bit rich, however a little extra fuel will help cool the heads. If one tries to lean out part throttle running the engine will balk on takeoff. |
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Posts in this topic
yeahmag Target AFR at Idle/Cruise with carbs Jun 23 2011, 09:21 PM
kg6dxn That target AFR is good. You need a head temp gaug... Jun 23 2011, 09:37 PM yeahmag I run both an LM-1 for AFR and a temp compensated ... Jun 23 2011, 09:41 PM Ductech Aircooled motors like a little extra gas to cool w... Jun 24 2011, 12:09 AM r_towle if you have the gauges, start testing.
Seems these... Jun 24 2011, 07:47 AM 70_914 Your car will run faster and faster, making more p... Jun 24 2011, 07:49 AM
yeahmag I think there are some mis-statements here...
O... Jun 24 2011, 11:06 AM brant Aaron,
I know I'm just one more opinion and ... Jun 24 2011, 11:45 AM yeahmag I love opinions! That's why I ask on a for... Jun 24 2011, 11:48 AM brant if you lean out the idle a bit and don't get h... Jun 24 2011, 11:52 AM jmill
One should set the idle jets for a good mix when ... Jun 24 2011, 02:22 PM yeahmag Just got back from a small drive. Maybe 5-6 miles ... Jun 24 2011, 02:48 PM Ductech
Just got back from a small drive. Maybe 5-6 miles... Jun 30 2011, 11:57 AM yeahmag I'm looking at Permatex 1372:
http://www.dril... Jun 30 2011, 12:21 PM Ductech
I'm looking at Permatex 1372:
http://www.dri... Jun 30 2011, 05:06 PM |
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