Re: same issues, but more irritating

Tony Daniel /
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First off, I guess you have a BING carburator? This carburator has only one place that will supply fuel to the engine. This is the main jet. Whether it is idling or WOT the fuel is supplied through the main jet. The idle screw should probably be called a slide adjustment screw because all it does is raise and lower the throttle slide, in the Ventura, controlling the incoming air at idle. Ventura is the name of the bore through the carb.

Now the fuel fills up in the float bowl to a specific level and then the fuel inlet needle stops the flow of fuel. As the air passes through the ventura it pulls the fuel, up through the main jet, into the needle valve and the fuel mixes with the air going into the engine. If the fuel level is low, not much fuel gets pulled up. If it is high, a greater amount of fuel gets pulled in. Why? The difference in the distance that the air has to pull the fuel up.

The needle rod is tapered and hangs in the needle jet above the main jet. This tapered rod controls how much fuel passes to the engine at various throttle positions. If you look at the needle jet you will see that there is a orifice at the top that the needle drops into, it is similar to the jet but bigger.

Now the four grooves at the top of the needle rod, they are for setting the distance that the tapered part of the needle hangs in the orifice. IF the top groove is used, the tapered rod hangs deeper into this orifice, smaller opening, less fuel supply. If the bottom groove is used, it raises the rod and a narrower part of the taper is in the orifice creating a bigger opening allowing more fuel throughout the throttle positions. At wide open throttle, it is completely out of this orifice to supply the maximum amount of fuel. Hope this helps,

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  same issues, but more irritatingTopic by: James Foster James Foster 01/26/05 07:28PM
  Re: same issues, but more irritatingRe: Paul P Paul P 01/26/05 08:25PM
  Re: same issues, but more irritatingRe: John Joedicke John Joedicke 01/26/05 08:41PM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/26/05 08:42PM
  Re: same issues, but more irritatingRe: Jason Luther Jason Luther 01/26/05 08:53PM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/26/05 09:05PM
  Re: same issues, but more irritatingRe: Paul P Paul P 01/26/05 09:51PM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/26/05 09:55PM
  Re: same issues, but more irritatingRe: Tony Daniel Tony Daniel 01/27/05 02:05AM
  Re: same issues, but more irritatingRe: Joe Woods Joe Woods 01/27/05 03:31AM
  Re: same issues, but more irritatingRe: Tony Daniel Tony Daniel 01/27/05 11:24AM
  Re: same issues, but more irritatingRe: Jason Luther Jason Luther 01/29/05 08:23PM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/27/05 10:13AM
  Re: same issues, but more irritatingRe: Tony Daniel Tony Daniel 01/27/05 11:21AM
  Re: same issues, but more irritatingRe: Joe Woods Joe Woods 01/27/05 12:48PM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/27/05 01:33PM
  Re: same issues, but more irritatingRe: Tony Daniel Tony Daniel 01/27/05 03:01PM
  Re: same issues, but more irritatingRe: Richard Wisniewski Richard Wisniewski 01/30/05 11:37AM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/27/05 04:14PM
  Re: same issues, but more irritatingRe: Jason Luther Jason Luther 01/27/05 06:49PM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/27/05 07:16PM
  Re: same issues, but more irritatingRe: Jason Luther Jason Luther 01/27/05 09:41PM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/27/05 10:28PM
  Re: same issues, but more irritatingRe: Joe Woods Joe Woods 01/27/05 11:16PM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/28/05 12:08AM
  Re: same issues, but more irritatingRe: Joe Woods Joe Woods 01/28/05 12:34AM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/28/05 01:14AM
  Re: same issues, but more irritatingRe: Tony Daniel Tony Daniel 01/28/05 01:31AM
  Re: same issues, but more irritatingRe: Joe Woods Joe Woods 01/28/05 01:32AM
  Re: same issues, but more irritatingRe: Tony Daniel Tony Daniel 01/28/05 01:43AM
  Re: same issues, but more irritatingRe: E K E K 01/28/05 03:45AM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/28/05 10:55AM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/30/05 01:34AM
  Re: same issues, but more irritatingRe: Richard Wisniewski Richard Wisniewski 01/30/05 11:32AM
  Re: same issues, but more irritatingRe: James Foster James Foster 01/30/05 01:43PM
  Re: same issues, but more irritatingRe: Jason Luther Jason Luther 02/03/05 09:06PM
  Re: same issues, but more irritatingRe: James Foster James Foster 02/04/05 12:16AM
  Re: same issues, but more irritatingRe: Ben Van Zoest Ben Van Zoest 02/04/05 02:37AM
  Re: same issues, but more irritatingRe: James Foster James Foster 02/04/05 10:08AM
  Re: same issues, but more irritatingRe: James Foster James Foster 02/05/05 05:43PM
  Re: same issues, but more irritatingRe: Jason Luther Jason Luther 02/05/05 06:21PM
  Re: same issues, but more irritatingRe: James Foster James Foster 02/05/05 06:40PM
  Re: same issues, but more irritatingRe: Jason Luther Jason Luther 02/05/05 06:57PM
  Re: same issues, but more irritatingRe: James Foster James Foster 02/05/05 09:32PM

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